Features MIC BM GND 5 8. Fixed Regulator Circuit MIC4680BM GND SOP Adjustable Regulator Circuit
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1 MIC68 A khz SuperSwitcher Buck Regulator Final Information General Description The MIC68 SuperSwitcher is an easy-to-use fixed or adjustable output voltage step-down (buck) switch-mode voltage regulator. The khz MIC68 achieves up to.a of continuous output current over a wide input range in a 8-lead SOP (small outline package). The MIC68 is available in.v and 5V fixed output versions or adjustable output down to.5v. The MIC68 has an input voltage range of V to V, with excellent line, load, and transient response. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. In shutdown mode, the regulator draws less than µa of standby current. The MIC68 SuperSwitcher regulator requires a minimum number of external components and can operate using a standard series of inductors and capacitors. Frequency compensation is provided internally for fast transient response and ease of use. The MIC68 is available in the 8-lead SOP with a C to +5 C junction temperature range. Features SO-8 package with up to.a output current All surface mount solution Only external components required Fixed khz operation.v, 5V, and adjustable output versions Internally compensated with fast transient response Wide V to V operating input voltage range Less than µa typical shutdown-mode current Up to 9% efficiency Thermal shutdown Overcurrent protection Applications Simple A high-efficiency step-down (buck) regulator Replacement of TO- and TO-6 designs Efficient preregulator (5V to.5v, V to.v, etc.) On-card switching regulators Positive-to-negative converter (inverting buck-boost) Simple battery charger Negative boost converter Higher output current regulator using external FET Typical Applications SHUTDOWN ENABLE +6V to +V C 5µF 5V Power SOP-8 MIC68-.BM IN SW SHDN FB 5 8 L 68µH D B6A or SS6.V/A C µf 6V Fixed Regulator Circuit SHUTDOWN ENABLE MIC68BM C IN SW 5µF 5V SHDN FB Power SOP V to +V L 68µH D B6A or SS6 R.k R.9k.5V/A C µf 6V Adjustable Regulator Circuit SuperSwitcher is a trademark of 8 Fortune Drive San Jose, CA 95 USA tel + (8) 9-8 fax + (8) 7- February 5 MIC68
2 Ordering Information Part Number Junction Standard Pb-Free Voltage Temp. Range Package MIC68BM MIC68YM Adj C to +5 C 8-lead SOP MIC68-.BM MIC68-.YM.V C to +5 C 8-lead SOP MIC68-5.BM MIC68-5.YM 5.V C to +5 C 8-lead SOP Pin Configuration SHDN 8 IN 7 SW 6 FB 5 SOP-8 (M) Pin Description Pin Number Pin Name Pin Function SHDN Shutdown (Input): Logic low enables regulator. Logic high (>.6V) shuts down regulator. VIN Supply Voltage (Input): Unregulated +V to +V supply voltage. SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. FB Feedback (Input): Connect to output on fixed output voltage versions, or to.v-tap of voltage-divider network for adjustable version. 5 8 Ground MIC68 February 5
3 Absolute Maximum Ratings (Note ) Supply Voltage (V IN ), Note...+8V Shutdown Voltage (V SHDN )....V to +8V Steady-State Output Switch Voltage (V SW )... V Feedback Voltage [Adjustable] (V FB )...+V Storage Temperature (T S ) C to +5 C ESD, Note 5 Operating Ratings (Note ) Supply Voltage (V IN ), Note... +V to +V Junction Temperature (T J ) C Package Thermal Resistance (θ JA ), Note C/W Electrical Characteristics V IN = V; I LOAD = 5mA; T J = 5 C, bold values indicate C T J +5 C, Note 7; unless noted. Parameter Condition Min Typ Max Units MIC68 [Adjustable] Feedback Voltage (±%).7.. V (±%).5.55 V 8V V IN V,.A I LOAD A, V OUT = 5V V.8.8 V Maximum Duty Cycle V FB =.V 9 97 % Output Leakage Current V IN = V, V SHDN = 5V, V SW = V 5 5 µa V IN = V, V SHDN = 5V, V SW = V ma Quiescent Current V FB =.5V 7 ma MIC68-. Output Voltage (±%).66.. V (±%)..99 V 6V V IN V,.A I LOAD A.68.. V.5.65 V Maximum Duty Cycle V FB =.5V 9 97 % Output Leakage Current V IN = V, V SHDN = 5V, V SW = V 5 5 µa V IN = V, V SHDN = 5V, V SW = V ma Quiescent Current V FB =.V 7 ma MIC68-5. Output Voltage (±%) V (±%) V 8V V IN V,.A I LOAD A V V Maximum Duty Cycle V FB =.V 9 97 % Output Leakage Current V IN = V, V SHDN = 5V, V SW = V 5 5 µa V IN = V, V SHDN = 5V, V SW = V ma Quiescent Current V FB = 6.V 7 ma February 5 MIC68
4 Parameter Condition Min Typ Max Units MIC68/-./-5. Frequency Fold Back 5 khz Oscillator Frequency 8 khz Saturation Voltage I OUT = A..8 V V Short Circuit Current Limit V FB = V, see Test Circuit..8.5 A Standby Quiescent Current V SHDN = V IN.5 µa V SHDN = 5V (regulator off) µa Shutdown Input Logic Level regulator off.6 V regulator on..8 V Shutdown Input Current V SHDN = 5V (regulator off).5 µa V SHDN = V (regulator on).5 µa Thermal Shutdown 6 C Note. Note. Note. Note. Note 5. Note 6. Note 7. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Absolute maximum rating is intended for voltage transients only, prolonged dc operation is not recommended. V IN(min) = V OUT +.5V or V whichever is greater. Devices are ESD sensitive. Handling precautions recommended. Measured on " square of oz. copper FR printed circuit board connected to the device ground leads. Test at T A = +85 C, guaranteed by design, and characterized to T J = +5 C. Test Circuit +V Device Under Test IN SW 68µH SHUTDOWN ENABLE SHDN FB I SOP Current Limit Test Circuit Shutdown Input Behavior OFF ON GUARANTEED ON TYPICAL ON.8V GUARANTEED OFF TYPICAL OFF V V.6V V IN(max) V Shutodwn Hysteresis MIC68 February 5
5 Typical Characteristics OUTPUT VOLTAGE (V) Line Regulation I OUT =.A INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) Load Regulation V IN = V V OUT = 5V OUTPUT CURRENT (A) CURRENT (µa) 8 6 Shutdown Current vs. Input Voltage INPUT VOLTAGE (V) CURRENT (µa) Shutdown Current vs. Temperature V IN = V V SHDN = V IN TEMPERATURE ( C) OUTPUT VOLTAGE (V) 6 5 Current Limit Characteristic V IN = V OUTPUT CURRENT (A) FREQUENCY (khz) Frequency vs. Supply Voltage SUPPLY VOLTAGE (V) FREQUENCY (khz) 9 Frequency vs. Temperature TEMPERATURE ( C) FEEDBACK VOLTAGE (V) Feedback Voltage vs. Temperature. V IN = V. V OUT = 5V I OUT = A TEMPERATURE ( C) SATURATION VOLTAGE (V).6... Saturation Voltage vs. Temperature.8.6 V IN = V. V OUT = 5V. I LOAD = A TEMPERATURE ( C) EFFICIENCY (%) V.V Output Efficiency V 6V OUTPUT CURRENT (A) EFFICIENCY (%) 5V Output Efficiency V 6 V V OUTPUT CURRENT (A) EFFICIENCY (%) V Output Efficiency V V OUTPUT CURRENT (A) February 5 5 MIC68
6 OUTPUT CURRENT (A) Safe Operating Area V OUT = 5V T A = 6 C Demonstration board layout Minimum Current Limit Note INPUT VOLTAGE (V) Note. For increased output current, see Applications Information: Increasing the Maximum Output Current and Figure. Functional Characteristics Switching Frequency Foldback Load Transient V SW (NORMAL) V IN, 5V/A OUT khz Normal Operation V OUT (mv/div.) V IN = V V OUT = 5V I OUT =.A to.a 5.V 5V V SW (SHORTED) V IN, V OUT 6kHz Short Circuit Operation I OUT (5mA/div.) A A TIME TIME (ms/div.) Frequency Foldback The MIC68 folds the switching frequency back during a hard short-circuit condition to reduce the energy per cycle and protect the device. MIC68 6 February 5
7 Bode Plots The following bode plots show that the MIC68 is stable over all conditions using a 68µF inductor (L) and a µf output capacitor (C OUT ). To assure stability, it is a good practice to maintain a phase margin of greater than 5. No-Load Stability Phase Margin = 6 Full-Load Stability Phase Margin = L = 68µF C OUT = µf V IN = 7V V OUT = 5.V I OUT =.A L = 68µF C OUT = µf V IN = 7V V OUT = 5.V I OUT =.A TIME (ms/div.) TIME (ms/div.) No-Load Stability Phase Margin = 7 Full-Load Stability Phase Margin = 69 L = 68µF C OUT = µf V IN = V V OUT = 5.V I OUT =.A L = 68µF C OUT = µf V IN = V V OUT = 5.V I OUT =.A TIME (ms/div.) TIME (ms/div.) No-Load Stability Phase Margin = 5 Full-Load Stability Phase Margin = 7 L = 68µF C OUT = µf L = 68µF C OUT = µf V IN = V V OUT = 5.V I OUT =.A V IN = V V OUT = 5.V I OUT =.A TIME (ms/div.) TIME (ms/div.) February 5 7 MIC68
8 Block Diagrams IN V IN SHDN Internal Regulator khz Oscillator Thermal Shutdown Current Limit Comparator Reset Driver A Switch SW V OUT C OUT FB MIC68-x.x Error Amp.V Bandgap Reference Fixed Regulator IN V IN SHDN Internal Regulator R VOUT = VREF + R khz Oscillator Thermal Shutdown Current Limit R R V OUT = V REF VREF =.V Comparator Reset Driver A Switch SW V OUT C OUT MIC68 [adj.] Error Amp.V Bandgap Reference FB R R Adjustable Regulator MIC68 8 February 5
9 Functional Description The MIC68 is a variable duty cycle switch-mode regulator with an internal power switch. Refer to the block diagrams. Supply Voltage The MIC68 operates from a +V to +V unregulated input. Highest efficiency operation is from a supply voltage around +5V. See the efficiency curves. Enable/Shutdown The shutdown (SHDN) input is TTL compatible. Ground the input if unused. A logic-low enables the regulator. A logichigh shuts down the internal regulator which reduces the current to typically.5µa when V SHDN = V IN = V and µa when V SHDN = 5V. See Shutdown Input Behavior: Shutdown Hysteresis. Feedback Fixed-voltage versions of the regulator have an internal resistive divider from the feedback (FB) pin. Connect FB directly to the output voltage. Adjustable versions require an external resistive voltage divider from the output voltage to ground, center tapped to the FB pin. See Figure 6b for recommended resistor values. Duty Cycle Control A fixed-gain error amplifier compares the feedback signal with a.v bandgap voltage reference. The resulting error amplifier output voltage is compared to a khz sawtooth waveform to produce a voltage controlled variable duty cycle output. A higher feedback voltage increases the error amplifier output voltage. A higher error amplifier voltage (comparator inverting input) causes the comparator to detect only the peaks of the sawtooth, reducing the duty cycle of the comparator output. A lower feedback voltage increases the duty cycle. The MIC68 uses a voltage-mode control architecture. Output Switching When the internal switch is on, an increasing current flows from the supply V IN, through external storage inductor L, to output capacitor C OUT and the load. Energy is stored in the inductor as the current increases with time. When the internal switch is turned off, the collapse of the magnetic field in L forces current to flow through fast recovery diode D, charging C OUT. Output Capacitor External output capacitor C OUT provides stabilization and reduces ripple. See Bode Plots for additional information. Return Paths During the on portion of the cycle, the output capacitor and load currents return to the supply ground. During the off portion of the cycle, current is being supplied to the output capacitor and load by storage inductor L, which means that D is part of the high-current return path. February 5 9 MIC68
10 Applications Information Adjustable Regulators Adjustable regulators require a.v feedback signal. Recommended voltage-divider resistor values for common output voltages are included in Figure b. For other voltages, the resistor values can be determined using the following formulas: R VOUT = VREF + R R R V OUT = V REF VREF =.V SHUTDOWN ENABLE V IN C IN MIC68BM IN SW SHDN FB 5 8 L R D R Figure a. Adjustable Regulator Circuit V OUT C OUT V O UT R * R*.8V.k 6.9k.5V.k.9k.V.k.78k 5.V.k 976Ω 6.V.k 787Ω C IN D L C OUT 68µH.5A A 6V Schottky 5µF 5V AVX TPSE565R * All resistors % ** shielded magnetics for low RFI applications *** Vishay-Diode, Inc. (85) 6-8 B6A Vishay-Diode, Inc.*** or SS6 General Semiconductor Coiltronics UPB-68 or Sumida CDRH5-68MC** or Sumida CDRH-68MC** Figure b. Recommended Components for Common Ouput Voltages µf V AVX TPSE7R6 MIC68 February 5
11 Thermal Considerations The MIC68 SuperSwitcher features the power-sop-8. This package has a standard 8-lead small-outline package profile but with much higher power dissipation than a standard SOP-8. The MIC68 SuperSwitcher is the first dc-to-dc converter to take full advantage of this package. The reason that the power SOP-8 has higher power dissipation (lower thermal resistance) is that pins 5 though 8 and the die-attach paddle are a single piece of metal. The die is attached to the paddle with thermally conductive adhesive. This provides a low thermal resistance path from the junction of the die to the ground pins. This design significantly improves package power dissipation by allowing excellent heat transfer through the ground leads to the printed circuit board. One of the limitation of the maximum output current on any MIC68 design is the junction-to-ambient thermal resistance (θ JA ) of the design (package and ground plane). Examining θ JA in more detail: θ JA = (θ JC + θ CA ) where: θ JC = junction-to-case thermal resistance θ CA = case-to-ambient thermal resistance θ JC is a relatively constant C/W for a power SOP-8. θ CA is dependent on layout and is primarily governed by the connection of pins 5 though 8 to the ground plane. The purpose of the ground plane is to function as a heat sink. θ JA is ideally 6 C/W but will vary depending on the size of the ground plane to which the power SOP-8 is attached. Determining Ground-Plane Heat-Sink Area There are two methods of determining the minimum ground plane area required by the MIC68. Quick Method Make sure that MIC68 pins 5 though 8 are connected to a ground plane with a minimum area of 6cm. This ground plane should be as close to the MIC68 as possible. The area maybe disributed in any shape around the package or on any pcb layer as long as there is good thermal contact to pins 5 though 8. This ground plane area is more than sufficient for most designs. SOP-8 θ JC θ JA θ CA printed circuit board AMBIENT ground plane heat sink area Figure. Power SOP-8 Cross Section Minimum Copper/Maximum Current Method Using Figure, for a given input voltage range, determine the minimum ground-plane heat-sink area required for the application s maximum output current. Figure assumes a constant die temperature of 75 C above ambient. OUTPUT CURRENT (I) V V V V AREA (cm ) T A = 5 C Minimum Current Limit =.A Figure. Output Current vs. Ground Plane Area When designing with the MIC68, it is a good practice to connect pins 5 through 8 to the largest ground plane that is practical for the specific design. Checking the Maximum Junction Temperature: For this example, with an output power (P OUT ) of 5W, (5V output at A maximum with V IN = V) and 65 C maximum ambient temperature, what is the maximum junction temperature? Referring to the Typical Characteristics: 5V Output Efficiency graph, read the efficiency (η) for A output current at V IN = V or perform you own measurement. η = 79% The efficiency is used to determine how much of the output power (P OUT ) is dissipated in the regulator circuit (P D ). P = P OUT D POUT η P = 5W D.79 5W P D =.W A worst-case rule of thumb is to assume that 8% of the total output power dissipation is in the MIC68 (P D(IC) ) and % is in the diode-inductor-capacitor circuit. P D(IC) =.8 P D P D(IC) =.8.W P D(IC) =.6W Calculate the worst-case junction temperature: T J = P D(IC) θ JC + (T C T A ) + T A(max) where: T J = MIC68 junction temperature P D(IC) = MIC68 power dissipation θ JC = junction-to-case thermal resistance. The θ JC for the MIC68 s power-sop-8 is approximately C/W. (Also see Figure.) T C = pin temperature measurement taken at the entry point of pins 6 or 7 into the plastic package February 5 MIC68
12 at the ambient temperature (T A ) at which T C is measured. T A = ambient temperature at which T C is measured. T A(max) = maximum ambient operating temperature for the specific design. Calculating the maximum junction temperature given a maximum ambient temperature of 65 C: T J =.6 C/W + (5 C 5 C) + 65 C T J = 6. C This value is less than the allowable maximum operating junction temperature of 5 C as listed in Operating Ratings. Typical thermal shutdown is 6 C and is listed in Electrical Characteristics. Increasing the Maximum Output Current The maximum output current at high input voltages can be increased for a given board layout. The additional three MIC68BM IN SW components shown in Figure will reduce the overall loss in the MIC68 by about % at high V IN and high I OUT. Even higher output current can be achieved by using the MIC68 to switch an external FET. See Figure 9 for a 5A supply with current limiting. Layout Considerations Layout is very important when designing any switching regulator. Rapidly changing switching currents through the printed circuit board traces and stray inductance can generate voltage transients which can cause problems. To minimize stray inductance and ground loops, keep trace lengths, indicated by the heavy lines in Figure 5, as short as possible. For example, keep D close to pin and pins 5 through 8, keep L away from sensitive node FB, and keep C IN close to pin and pins 5 though 8. See Applications Information: Thermal Considerations for ground plane layout. The feedback pin should be kept as far way from the switching elements (usually L and D) as possible. A circuit with sample layouts are provided. See Figure 6a though 6e. SHDN FB N8.nF 8Ω D Figure. Increasing Maximum Output Current at High Input Voltages V IN +V to +V C IN IN MIC68BM SW SHDN FB Power SOP D L 68µH C OUT R R V OUT Load Figure 5. Critical Traces for Layout J V IN V to +V C 5µF 5V J OFF ON C.µF 5V S NKK GAP U MIC68BM IN SHDN SOP SW FB * C can be used to provide additional stability and improved transient response. D B6A or SS6 L 68µH R6 optional R.k R 6.9k JPa.8V C* optional R.9k 5 JPb.5V 6 R.78k 7 JPc.V 8 R5 976Ω JPd 5.V C µf V J V OUT A C5.µF 5V J Figure 6a. Evaluation Board Schematic Diagram MIC68 February 5
13 Printed Circuit Board Layouts Figure 6b. Top-Side Silk Screen Figure 6d. Bottom-Side Silk Screen Figure 6c. Top-Side Copper Figure 6e. Bottom-Side Copper Abbreviated Bill of Material (Critical Components) Reference Part Number Manufacturer Description Qty C TPSD56M5R AVX 5µF 5V ECE-AHFS7 Panasonic 7µF 5V, 8mm.5mm C TPSD7MR5 AVX µf V D B6A Vishay-Diodes, Inc. Schottky SS6 General Semiconductor L UPB-68 Coiltronics 68µH,.5A, nonshielded CDH5-68MC Sumida 5 68µH,.5A, nonshielded CDRH-68MC Sumida 5 68µH,.5A, shielded U MIC68BM Micrel Semiconductor 6 A khz power-so-8 buck regulator AVX: Panasonic: Vishay-Diodes, Inc., tel: (85) 6-8, Coiltronics, tel: (56) -7876, 5 Sumida, tel: (8) , 6 Micrel, tel: (8) 9-8, February 5 MIC68
14 Applications Circuits* For continuously updated circuits using the MIC68, see Application Hint 7 at J +V max. C µf 5V J OFF ON C nf S NKK GAP IN MIC68BM SHDN SOP SW FB L µh D MMBRLT LMDIM-. D N8 C µf V U R6 k C5 nf R.Ω R 6.k R5 k R7.99k 5 C nf D N8 U MIC6BM5 R.k R 976Ω J 5V ±% 8mA ±5% J To Cellular Telephone Figure 7. Constant Current and Constant Voltage Battery Charger J +V J C 68µF V C5 µf 5V U MIC68BM IN SW SHDN FB SOP L µh D ESB A V C.µF 5V R 8.87k R k C 68µF V J C.µF J V/5mA Figure 8. +V to V/5mA Buck-Boost Converter +.5V to +7V SHUTDOWN ENABLE C µf 5V U U MIC68BM MIC7BM IN SW SHDN SOP FB R k D 5A Si5DY L* 5µH C µf 6V * I SAT = 8A C µf 6V R mω R k % R k % R6 6k % C pf.v/5a R7.k % C5.µF D N8 R5 6k % U MIC6BM5 R8.78k % Figure 9. 5V to.v/5a Power Supply * See Application Hint 7 for bills of material. MIC68 February 5
15 February 5 5 MIC68
16 Package Information.6 (.65) MAX) PIN.57 (.99).5 (.8) DIMENSIONS: INCHES (MM).5 (.7) TYP. (.5). (.).98 (.9). (.) 5. (.5).7 (.8).6 (.6).5 (.).97 (5.) 8.89 (.8) SEATING PLANE 8-Lead SOP (M).5 (.7).6 (.). (6.).8 (5.79) MICREL INC. 8 FORTUNE DRIVE SAN JOSE, CA 95 USA TEL + (8) 9-8 FAX + (8) 7- WEB This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. Micrel Incorporated MIC68 6 February 5
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MIC391/3911/3912 MIC391/3911/3912 1A Low-Voltage Low-Dropout Regulator General Description The MIC391, MIC3911, and MIC3912 are 1A low-dropout linear voltage regulators that provide low-voltage, high-current
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MIC6952, Low V IN, Low V OUT µcap LDO Regulator General Description The MIC6952 is a, low dropout linear regulator that provides low voltage high current outputs with a minimum of external components.
More informationThe ASD5001 is available in SOT23-5 package, and it is rated for -40 to +85 C temperature range.
General Description The ASD5001 is a high efficiency, step up PWM regulator with an integrated 1A power transistor. It is designed to operate with an input Voltage range of 1.8 to 15V. Designed for optimum
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4MHz PWM Synchronous Buck Regulator with LDO Standby Mode General Description The Micrel is a high efficiency 4MHz pulse width modulated (PWM) synchronous buck (stepdown) regulator that features a LOWQ
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400kHz SO-8 Boost Control IC General Description Micrel s is a high efficiency PWM boost control IC housed in a SO-8 package. The is optimized for low input voltage applications. With its wide input voltage
More informationMIC37150/51/52/53. General Description. Features. Applications. Typical Application. 1.5A, Low Voltage µcap LDO Regulator
1.5A, Low Voltage µcap LDO Regulator General Description The Micrel is a 1.5A low-dropout linear voltage regulator that provides a low voltage, high current output with a minimum of external components.
More informationMIC2291. General Description. Features. Applications. Typical Application. 1.2A PWM Boost Regulator Photo Flash LED Driver
1.2A PWM Boost Regulator Photo Flash LED Driver General Description The is a 1.2MHz Pulse Width Modulation (PWM), boost-switching regulator that is optimized for high-current, white LED photo flash applications.
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The Future of Analog IC Technology DESCRIPTION The MP8368 is a monolithic step-down switch mode converter with a built-in internal power MOSFET. It achieves 1.8A continuous output current over a wide input
More informationSP3613. Order Information PIN CONFIGURATIONN PIN NAME DISCRIPTION TYPICAL APPLICATION. 1 VIN Input
60, 3A STEP DOWN OLTAGE SWITCHING REGULATOR DESCRIPTION The SP3613 series is designed to provide all the active function for a step-down (buck) switching regulator, and drives a maximum load current as
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Single-Cell Ultra Low EMI Boost LED Driver General Description The is a boost LED driver optimized for single cell operation from alkaline, nickel-metal-hydride, or lithium ion batteries. The operates
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/H /H Series 3A Step-Down Switching Regulator DESCRIPTION The series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable
More informationeorex (Preliminary) EP3101
(Preliminary) 150 KHz, 3A Asynchronous Step-down Converter Features Output oltage: 3.3, 5, 12 and Adjustable Output ersion Adjustable ersion Output oltage Range, 1.23 to 37 ±4% 150KHz±15% Fixed Switching
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The Future of Analog IC Technology MP2490 1.5A, 36V, 700KHz Step-Down Converter with Programmable Output Current Limit DESCRIPTION The MP2490 is a monolithic step-down switch mode converter with a programmable
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White LED Driver Internal Schottky Diode and OVP General Description The is a PWM (pulse width modulated), boostswitching regulator that is optimized for constant-current white LED driver applications.
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1.5A Synchronous Buck Regulator General Description The Micrel is a 00kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery-powered applications. The operates from a
More informationFeatures. Applications
105MHz Low-Power SOT23-5 Op Amp General Description The is a high-speed operational amplifier which is unity gain stable regardless of resistive and capacitive load. It provides a gain-bandwidth product
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MIC4414/4415 1.5A, 4.5V to 18V, Low-Side MOSFET Driver General Description The MIC4414 and MIC4415 are low-side MOSFET drivers designed to switch an N-channel enhancement type MOSFET in low-side switch
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General Description The TD1507 is a easy to use adjustable step-down (buck) switch-mode voltage regulators. The device is available in an adjustable output version. It is capable of driving a 2.5A load
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150mA µcap CMOS LDO Regulator w/power Good General Description The is an efficient, general purpose 1.2V CMOS voltage regulator with a power good output function. The offers better than 3%initial accuracy,
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5A Fast-Response LDO Regulator General Description The MIC29510 and MIC29512 are high-current, highaccuracy, low-dropout voltage regulators featuring fast transient recovery from input voltage surges and
More informationMIC5206. General Description. Features. Applications. Typical Application. 150mA Low-Noise LDO Regulator
MIC526 5mA Low-Noise LDO Regulator General Description The MIC526 is an efficient linear voltage regulator with very low dropout voltage (typically 7 at light loads and 65 at 5mA), and very low ground
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High-Efficiency Low EMI Boost Regulator General Description The is a general purpose DC/DC boost switching regulator that features low noise, EMI reduction circuitry, and high efficiency across a wide
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MIC388/389 Push-Pull PWM Controller General Description The MIC388 and MIC389 are a family of complementary output push-pull PWM control ICs that feature high speed and low power consumption. The MIC388/9
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MIC6/7 MIC6/7 IttyBitty Low-Side MOSFET Driver eneral Description The MIC6 and MIC7 IttyBitty low-side MOSFET drivers are designed to switch an N-channel enhancementtype MOSFET from a TTL-compatible control
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MIC38HC42/3/4/5 BiCMOS 1A Current-Mode PWM Controllers General Description The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel s BiCMOS devices
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MIC2292/93 High Frequency PWM White LED Drivers with Internal Schottky Diode and OP General Description The MIC2292 and MIC2293 are high frequency, Pulse Width Modulator (PWM) boost regulators optimized
More informationFeatures. Applications V IN C IN
3.A, Low-Voltage µcap LDO Regulator General Description The Micrel is a 3.A low-dropout linear voltage regulator that provides a low-voltage, high-current output with a minimum number of external components.
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180mA Low-Noise LDO Regulator General Description The is an efficient linear voltage regulator with ultra-low-noise output, very low dropout voltage (typically 17 at light loads and 165 at 150mA), and
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3A Fast-Response LDO Regulator for USB General Description The is a 3A, fast response, low-dropout (LDO) voltage regulator. Using Micrel s proprietary Super βeta PNP process, the offers exceptional dropout
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1.2A, 1.2MHz/2MHz Wide Input Range Integrated Switch Boost Regulator General Description The is a 1.2MHz/2MHz, PWM DC/DC boost switching regulator available in a 2mm x 2mm MLF package. High power density
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MIC38C42A/43A/44A/45A BiCMOS Current-Mode PWM Controllers General Description The MIC38C4xA are fixed frequency, high performance, current-mode PWM controllers. Micrel s BiCMOS devices are pin compatible
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1.5A, Low-Voltage µcap LDO Regulator General Description The Micrel is a 1.5A low-dropout linear voltage regulator that provides a low-voltage, high-current output with a minimum of external components.
More informationMIC4827. Features. General Description. Applications. Typical Application. Low Input Voltage, 180V PP Output Voltage, EL Driver
Low Input Voltage, 10V PP Output Voltage, EL Driver General Description Micrel s is a high output voltage, DC to AC converter, designed for driving EL (Electroluminescent) lamps. The device operates from
More informationMIC BML MIC BML
MIC9/93 High Frequency PWM White LED Drivers with Internal Schottky Diode and OVP General Description The MIC9 and MIC93 are high frequency, Pulse Width Modulator (PWM) boost regulators optimized for constantcurrent,
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General Description The is a series of easy to use fixed and adjustable step-down (buck) switch-mode voltage regulators. These devices are available in fixed output voltage of 3.3V, 5V, and an adjustable
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FEATURES Standard PSOP-8/TO-220-5L /TO-263-5L Package Adjustable Output Versions Adjustable Version Output Voltage Range 1.23V to 37V V OUT Accuracy is to ± 3% Under Specified Input Voltage the Output
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IttyBitty High-Side MOSFET Driver General Description The IttyBitty high-side MOSFET driver is designed to switch an N-channel enhancement-type MOSFET from a TTL compatible control signal in high- or low-side
More informationFeatures. Applications
High-Current Low-Dropout Regulators General Description The is a high current, high accuracy, lowdropout voltage regulators. Using Micrel's proprietary Super βeta PNP process with a PNP pass element, these
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MIC4915 1.5A Low oltage LDO Regulator w/dual Input oltages General Description The MIC4915 is a high-bandwidth, low-dropout, 1.5A voltage regulator ideal for powering core voltages of lowpower microprocessors.
More informationMIC5238. General Description. Features. Applications. Typical Application. Ultra-Low Quiescent Current, 150mA µcap LDO Regulator
Ultra-Low Quiescent Current, 150mA µcap LDO Regulator General Description The is an ultra-low voltage output, 150mA LDO regulator. Designed to operate in a single supply or dual supply mode, the consumes
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RT8580 36V DC-DC Boost Converter General Description The RT8580 is a high performance, low noise, DC-DC Boost Converter with an integrated 0.5A, 1Ω internal switch. The RT8580's input voltage ranges from
More informationTechcode. 3A 150KHz PWM Buck DC/DC Converter TD1501H. General Description. Features. Applications. Package Types DATASHEET
General Description Features The TD1501H is a series of easy to use fixed and adjustable step-down (buck) switch-mode voltage regulators. These devices are available in fixed output voltage of 5V, and
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General Description The is a of easy to use adjustable step-down (buck) switch-mode voltage regulator. The device is available in an adjustable output version. It is capable of driving a 2A load with excellent
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FEATURES 3.3, 5.0, 12, and Adjustable Output version Adjustable Output oltage range, 1.2 to 37 ±4% Max. Over Line and Load conditions Guaranteed Output Current of 3A Available in TO-263, TO-220 Packages
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MIC9 MHz Low-Power SC-7 Op Amp General Description The MIC9 is a high-speed operational amplifier with a gain-bandwidth product of MHz. The part is unity gain stable. It has a very low.ma supply current,
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Low-Power Dual 300mA LDO in 1.2mm x 1.6mm Extra Thin DFN General Description The is an advanced dual LDO ideal for powering general purpose portable devices. The provides two high-performance, independent
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1mA Low Noise µcap Teeny LDO General Description The is an efficient, CMOS voltage regulator optimized for ultra-low-noise applications. It offers 1.5% initial accuracy, extremely low dropout voltage (165mV
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MP2456 0.5A, 50V, 1.2MHz Step-Down Converter in a TSOT23-6 DESCRIPTION The MP2456 is a monolithic, step-down, switchmode converter with a built-in power MOSFET. It achieves a 0.5A peak-output current over
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SEMICONDUCTOR TECHNICAL DATA FAC1509 General Description The FAC1509 is a of easy to use adjustable step-down (buck) switch-mode voltage regulator. The device is available in an adjustable output version.
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MIC532 15mA ULDO in Ultra-Small 1.2mm x 1.6mm Thin MLF General Description The MIC532 is an ultra-small, ultra-low dropout CMOS regulator, ULDO that is ideal for today s most demanding portable applications
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MIC525 MIC525 5mA Low-Noise LDO Regulator Final Information General Description The MIC525 is an efficient linear voltage regulator with ultralow-noise output, very low dropout voltage (typically 7mV at
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Triple High PSRR, Low Noise µcap LDO General Description The is a high performance, triple LDO voltage regulator, with each regulator capable of providing 250mA continuous output current. Ideal for battery
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3A, Low Voltage, Adjustable LDO Regulator with Dual Input Supply General Description The is a high-bandwidth, low-dropout, 3A voltage regulator ideal for powering core voltages of lowpower microprocessors.
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2.5A Synchronous Buck Regulator General Description The Micrel is a 200kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery-powered applications. The operates from
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MIC9 MIC9 8MHz Low-Power SC-7 Op Amp General Description The MIC9 is a high-speed operational amplifier with a gain-bandwidth product of 8MHz. The part is unity gain stable. It has a very low µa supply
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High Efficiency 1MHz Synchronous Buck Regulator General Description The Micrel is a high efficiency 1MHz PWM synchronous buck switching regulator. The features low noise constant frequency PWM operation
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Low Voltage Dual 300mA LDO with Power on Reset and Voltage Select General Description The is a high performance, dual low input voltage, low dropout regulator with Power On Reset (POR) and voltage select.
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2.5MHz Dual Phase PWM Buck Regulator General Description The Micrel is dual output 2-phase synchronous buck (step down) PWM DC/DC switching regulator. Power conversion efficiencies of above 95% are easily
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The Future of Analog IC Technology MP2359 1.2A, 24V, 1.4MHz Step-Down Converter in a TSOT23-6 DESCRIPTION The MP2359 is a monolithic step-down switch mode converter with a built-in power MOSFET. It achieves
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MIC6911/13 Single Supply V IN, LOW V IN, LOW V OUT, 1A LDO General Description The MIC6911/13 is the 1A output current member of the MIC69xxx family of high current, low voltage regulators, which support
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MIC535 5mA µcap Ultra-Low Dropout LDO Regulator General Description The MIC535 is a high-performance, 5mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current.
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