Features ENABLE SHUTDOWN. Ultra-Low-Noise Regulator Application
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1 5mA Low Noise µcap CMOS LDO General Description The is an efficient, precise CMOS voltage regulator optimized for ultra-low-noise applications. It offers % initial accuracy, extremely-low dropout voltage (35mV at 5mA) and low ground current (typically 9µA). The provides a very-low-noise output, ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for handheld and battery-powered devices, the provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to zero. The also works with low-esr ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Key features include current limit, thermal shutdown, faster transient response, and an active clamp to speed up device turn-off. Available in the 6-pin mm mm MLF package, the IttyBitty SOT-3-5 package and the new Thin SOT-3-5, which offers the same footprint as the standard IttyBitty SOT-3-5, but only mm tall. The offers a range of output voltages. All support documentation can be found on s web site at Features Input voltage range:.7v to 6.V Thin SOT package: mm height SOT-3-5 Ultra-low output noise: 3µV(rms) Stability with ceramic output capacitors Ultra-low dropout: 5mA High output accuracy:.% initial accuracy.% over temperature Low quiescent current: 9µA Tight load and line regulation TTL-Logic-controlled enable input Zero off-mode current Thermal shutdown and current limit protection Applications Cellular phones and pagers Cellular accessories Battery-powered equipment Laptop, notebook, and palmtop computers Consumer/personal electronics Typical Application C IN =.µf Ceramic Enable Shutdown (pin 3) may be connected directly to IN (pin ). V IN -x.xbm V OUT C OUT =.µf Ceramic ABLE SHUTDOWN V IN -x.xbml 6 C BYP (optional) C OUT V OUT Ultra-Low-Noise Regulator Application IttyBitty is a registered trademark of, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology., Inc. 849 Fortune Drive San Jose, CA 953 USA tel + (8) fax + (8) August, 4 M385-84
2 Ordering Information Part Number Marking Voltage Temperature Range Package Standard Pb-Free Standard Pb-Free -.5BM5 -.5YM5 LW5 LW5.5V C to +5 C SOT BM5 -.6YM5 LW6 LW6.6V C to +5 C SOT BM5 -.7YM5 LW7 LW7.7V C to +5 C SOT BM5 -.8YM5 LW8 LW8.8V C to +5 C SOT BML -.8YML W8 W8.8V C to +5 C 6-Pin MLF -.85BM5 -.85YM5 LWJ LWJ.85V C to +5 C SOT BM5 -.9YM5 LW9 LW9.9V C to +5 C SOT BM5-3.YM5 LW3 LW3 3.V C to +5 C SOT BML -3.YML W3 W3 3.V C to +5 C 6-Pin MLF -3.BM5-3.YM5 LW3 LW3 3.V C to +5 C SOT BM5-3.YM5 LW3 LW3 3.V C to +5 C SOT BM5-3.3YM5 LW33 LW33 3.3V C to +5 C SOT BD5 -.6YD5 NW6 NW6.6V C to +5 C TSOT BD5 -.7YD5 NW7 NW7.7V C to +5 C TSOT BD5 -.8YD5 NW8 NW8.8V C to +5 C TSOT BD5 -.85YD5 NWJ NWJ.85V C to +5 C TSOT BD5 -.9YD5 NW9 NWJ.9V C to +5 C TSOT BD5-3.YD5 NW3 NWJ 3.V C to +5 C TSOT BD5-3.3YD5 NW33 NWJ 3.3V C to +5 C TSOT-3-5 August, 4 M385-84
3 Pin Configuration 3 GND IN 3 GND IN 3 GND IN BYP LWxx 4 5 OUT -x.xbm5 (SOT-3-5) BYP KWxx 4 5 OUT -x.xym5 (SOT-3-5) BYP NWxx 4 5 OUT -x.xbd5 (TSOT-3-5) 6 BYP GND 5 NC IN 3 4 OUT -x.xbml 6-Pin mm mm MLF (ML) (Top View) Pin Description Pin Number Pin Number Pin Name Pin Function SOT MLF TSOT IN Supply Input. GND Ground. 3 Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. 4 6 BYP Reference Bypass: Connect external.µf C BYP.µF capacitor to GND to reduce output noise. May be left open. 5 4 OUT Regulator Output 5 NC No internal connection. EP GND Ground: Internally connected to the exposed pad. Connect externally to GND pin. August, 4 3 M385-84
4 Absolute Maximum Ratings () Supply Input Voltage (V IN )... V to +7V Enable Input Voltage (V )... V to +7V Power Dissipation (P D )... Internally Limited (3) Junction Temperature (T J )... C to +5 C Storage Temperature (T S ) C to +5 C Lead Temperature (soldering, 5 sec.)... C ESD (4)... kv Electrical Characteristics (5) V IN = V OUT + V, V = V IN; I OUT = µa; T J = 5 C, bold values indicate C T J +5 C; unless noted. Symbol Parameter Conditions Min Typical Max Units V O Output Voltage Accuracy I OUT = µa % % V LNR Line Regulation V IN = V OUT + V to 6V..5 %/V V LDR Load Regulation I OUT =.ma to 5mA (6).5.5 % V IN V OUT Dropout Voltage (7) I OUT = µa. 5 mv I OUT = ma 9 5 mv I OUT = 5mA 35 mv 5 mv I Q Quiescent Current V.4V (shutdown). µa I GND Ground Pin Current (8) I OUT = ma 9 5 µa I OUT = 5mA 7 µa PSRR Ripple Rejection f = Hz, C OUT =.µf, db f = Hz, V IN = V OUT + db f = khz, V IN = V OUT + 5 db I LIM Current Limit V OUT = V 45 ma e n Output Voltage Noise C OUT =.µf,, 3 µv(rms) f = Hz to khz Enable Input V IL Enable Input Logic-Low Voltage V IN =.7V to 5.5V, regulator shutdown.4 V V IH Enable Input Logic-High Voltage V IN =.7V to 5.5V, regulator enabled.6 V I Enable Input Current V IL.4V, regulator shutdown. µa Thermal Protection Operating Ratings () Input Voltage (V IN ) V to +6V Enable Input Voltage (V )... V to V IN Junction Temperature (T J )... C to +5 C Thermal Resistance SOT-3 (θ JA )...35 C/W MLF (θ JA )...9 C/W V IH.6V, regulator enabled. µa Shutdown Resistance Discharge 5 Ω Thermal Shutdown Temperature 5 C Thermal Shutdown Hysteresis C Notes:. Exceeding the absolute maximum rating may damage the device.. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any T A (ambient temperature) is P D (max) = (T J (max) T A )/θ JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θ JA of the -x.xbm5 (all versions) is 35 C/W on a PC board. See Thermal Considerations section for further details. 4. Devices are ESD sensitive. Handling precautions recommended. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from.ma to 5mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 7. Dropout Voltage is defined as the input-to-output differential at which the output voltage drops % below its nominal value measured at V differential. For outputs below.7v, dropout voltage is the input-to-output voltage differential with the minimum input voltage.7v. Minimum input operating voltage is.7v. 8. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. August, 4 4 M385-84
5 Typical Characteristics Power Supply Rejection Ratio 7 Power Supply Rejection Ratio 7 Power Supply Rejection Ratio 7 PSRR (db) 5 3 µa* 5mA* ma* 5mA* *I LOAD C OUT = µf Ceramic FRQUCY (Hz) PSRR (db) 5 3 µa* 5mA* ma* 5mA* * I LOAD C OUT = 4.7µF Ceramic FRQUCY (Hz) PSRR (db) 5 3 µf*.µf*.µf*.µf* * C BYP I LOAD = 5mA V IN = V OUT +.5V C OUT = µf Ceramic FRQUCY (Hz) PSRR (db) PSRR vs. Voltage Drop 7 I LOAD = µa 5 3 I LOAD = 5mA C OUT = µf C BYP = 8 VOLTAGE DROP (mv) PSRR (db) PSRR vs. Voltage Drop I LOAD = µa I LOAD = 5mA C OUT = µf 8 VOLTAGE DROP (mv) GROUND CURRT (µa) Ground Pin Current V IN = V OUT + V. OUTPUT CURRT (ma) GROUND CURRT (µa) Ground Pin Current I LOAD = µa GROUND CURRT (µa) Ground Pin Current I = 5mA LOAD GROUND CURRT (µa) Ground Pin Current 8 I = µa LOAD INPUT VOLTAGE (V) GROUND CURRT (µa) Ground Pin Current 8 I LOAD = 5mA INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) Dropout Characteristics I LOAD = µa.5 I = 5mA LOAD INPUT VOLTAGE (V) DROPOUT VOLTAGE (mv) Dropout Voltage I = µa LOAD August, 4 5 M385-84
6 SHORT CIRCUIT CURRT (ma) Short Circuit Current 5 V 49 IN = V OUT + V OUTPUT VOLTAGE (V) Output Voltage vs. Temperature.96 I LOAD = µa ABLE THRESHOLD VOLTAGE (V) Enable Threshold vs. Temperature.85 I LOAD = µa TIME (µs) Turn-On Time vs. Bypass Capacitance C IN = µf Ceramic C OUT = µf Ceramic I LOAD = µa 5 Prop Delay Rise Time BYPASS CAPACITANCE (pf) August, 4 6 M385-84
7 Functional Characteristics Line Transient Response Load Transient Response Input Voltage (V/div) Output Voltage (5mV/div) 4V C IN = µf Ceramic C OUT = µf Ceramic I OUT = µa 5V Output Voltage (5mV/div) Output Current (ma/div) µa 5mA C IN = µf Ceramic C OUT = µf Ceramic V IN = 4V TIME (µs/div) TIME (4µs/div) Enable Pin Delay Shutdown Delay Enable Voltage (V/div) C IN = µf Ceramic C OUT = µf Ceramic I OUT = µa C IN = µf Ceramic C OUT = µf Ceramic V IN = 4V Output Voltage (V/div) Output Voltage (V/div) Enable Voltage (V/div) TIME (µs/div) TIME (µs/div) August, 4 7 M385-84
8 Block Diagram IN Reference Voltage Startup/ Shutdown Control Quickstart/ Noise Cancellation BYP Thermal Sensor Undervoltage Lockout FAULT Error Amplifier Current Amplifier ACTIVE SHUTDOWN OUT GND August, 4 8 M385-84
9 Applications Information Enable/Shutdown The comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a zero off-modecurrent state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. This part is CMOS and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Capacitor The is a high performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A µf capacitor is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high frequency capacitors, such as small valued NPO dielectric type capacitors, help filter out high frequency noise and are good practice in any RF-based circuit. Output Capacitor The requires an output capacitor for stability. The design requires µf or greater on the output to maintain stability. The design is optimized for use with low-esr ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The maximum recommended ESR is 3mΩ. The output capacitor can be increased, but performance has been optimized for a µf ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype capacitors change capacitance by 5% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 5% and %, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Bypass Capacitor A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A.µF capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique quick-start circuit allows the to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the Typical Characteristics section for performance with different bypass capacitors. Active Shutdown The also features an active shutdown clamp, which is an N-Channel MOSFET that turns on when the device is disabled. This allows the output capacitor and load to discharge, de-energizing the load. No-Load Stability The will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The is designed to provide 5mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: T J(max) T A P D(max) = θ JA T J (max) is the maximum junction temperature of the die, 5 C, and T A is the ambient operating temperature. θ JA is layout dependent; Table shows examples of junction-toambient thermal resistance for the. Package θ JA Recommended θ JA " Square θ JC Minimum Footprint Copper Clad SOT C/W 85 C/W 45 C/W (M5 or D5) Table. SOT-3-5 Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: P D = (V IN V OUT ) I OUT + V IN I GND Substituting P D (max) for P D and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the -3.BM5 at 5 C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: 5 C 5 C P D (max) = 35 C/W P D (max) = 35mW The junction-to-ambient thermal resistance for the minimum footprint is 35 C/W, from Table. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.V and an output current of 5mA, the maximum input voltage can be determined. Because this device is CMOS and the ground current is typically µa over the load range, the power dissipation contributed by the ground current is < % and can be ignored for this calculation: 35mW = (V IN 3.V) 5mA 35mW = V IN 5mA 45mW 8mW = V IN 5mA V IN (max) = 5.4V Therefore, a 3.V application at 5mA of output current can accept a maximum input voltage of 5.4V in a SOT-3-5 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the Regulator Thermals section of s Designing with Low-Dropout Voltage Regulators handbook. August, 4 9 M385-84
10 Package Information.9 (.75) REF.95 (.37) REF.75 (.69).5 (.59) 3. (.8). (.) 3. (.9).8 (.).3 (.5).9 (.35) DIMSIONS: MM (INCH). (.8).9 (.4).5 (.).35 (.4).5 (.6). (.) SOT-3-5 (M5). (.4). (.4) Rev TSOT-3-5 (D5) August, 4 M385-84
11 Package Information (continued) TOP VIEW BOTTOM VIEW DIMSIONS IN MILLIMETERS SIDE VIEW Rev. 6-Pin MLF (ML) MICREL, INC. 849 FORTUNE DRIVE SAN JOSE, CA 953 USA TEL + (8) FAX + (8) WEB The information furnished by in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by for its use. reserves the right to change circuitry and specifications at any time without notification to the customer. 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 Products for use in life support appliances, devices or systems is at Purchaser s own risk and Purchaser agrees to fully indemnify for any damages resulting from such use or sale. 4, Incorporated. August, 4 M385-84
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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.
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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.
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MIC MIC Dual ma Low-Dropout Voltage Regulator Preliminary Information General Description The MIC is a family of dual linear voltage regulators with very low dropout voltage (typically 7mV at light loads
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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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MIC3975 750mA µcap Low-Voltage Low-Dropout Regulator General Description The MIC3975 is a 750mA low-dropout linear voltage regulators that provide low-voltage, high-current output from an extremely small
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Description GM6155 is a high efficient CMOS LDO with features as such ultra low noise output, ultra low dropout voltage (typically 17mV at light load and 165mV at 50mA load), and low ground current (600µA
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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.
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High-Performance Dual 150mA LDO General Description The is a tiny dual low-dropout linear regulator ideally suited for portable electronics. It is ideal for general purpose/digital applications which require
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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MIC519 5mA-Peak Output LDO Regulator General Description The MIC519 is an effi cient linear voltage regulator with high peak output current capability, very-low-dropout voltage, and better than 1% output
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MIC56 Low Quiescent Current µcap LDO Regulator General Description The MIC56 is a low quiescent current, µcap low-dropout regulator. With a maximum operating input voltage of V and a quiescent current
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MIC37/37/37 MIC37/37/37 A Low-Voltage µcap LDO Regulator General Description The MIC37, MIC37, and MIC37 are A low-dropout, linear voltage regulators that provide low-voltage, high-current output from
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Triple 2mA µcap LDO in 2.5mm x 2.5mm Thin MLF General Description The is a triple output device with three 2mA LDOs which is ideal for application processor support in mobile platforms. The MIC5373 provides
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MIC9431 2mA LDO with Ripple Blocker Technology General Description The MIC9431 Ripple Blocker is a monolithic integrated circuit that provides low-frequency ripple attenuation (switching noise rejection)
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6mA, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator General Description The is a high-performance, 6mA LDO regulator, offering extremely high PSRR and ultra-low dropout. This chip is ideal for portable
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High-Performance, Low-Noise, 1A LDOs General Description The and are high-performance, low-noise, low dropout regulators. Each of these LDOs is capable of sourcing 1A output current, offers high power
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RT9030 150mA, Low Input Voltage, Low Dropout, Low Noise Ultra- Fast Without Bypass Capacitor CMOS LDO Regulator General Description The RT9030 is a high-performance, 150mA LDO regulator, offering extremely
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RT9198/A 3mA, Low Noise, Ultra-Fast CMOS LDO Regulator General Description The RT9198/A is designed for portable RF and wireless applications with demanding performance and space requirements. The RT9198/A
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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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Applications CDMA/GSM Cellular Handsets Portable Information Appliances Laptop, Palmtops, Notebook Computers Hand-Held Instruments Mini PCI & PCI-Express Cards PCMCIA & New Cards RT9030 150mA, Low Input
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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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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.
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2mm 2mm PWM Boost Regulator with Internal Schotty Diode General Description The is a 1.2MHz, PWM, boost-switching regulator housed in the small size 2mm 2mm 8-pin MLF package. The features an internal
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General Description The CLZ6821 is a positive LDO regulator designed on patent pending CMOS circuit technologies. The device attains high ripple rejection ratio and superior line and load transient response
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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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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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Ultra-Low Noise Ultra-Fast 300mA LDO Regulator General Description The id9309 is a 300mA, low dropout and low noise linear regulator with high ripple rejection ratio and fast turn-on time. It has fixed
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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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Applications Digital Still Camera CDMA/GSM Cellular Handsets Portable Information Appliances Laptop, Palmtops, Notebook Computers Mini PCI & PCI-Express Cards PCMCIA & New Cards Pin Configurations RT92
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3.0A, Low-Voltage µcap LDO Regulator General Description The Micrel is a 3.0A low-dropout linear voltage regulator that provides a low voltage, high current output with a minimum number of external components.
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3A Low Voltage LDO Regulator with Dual Input Voltages General Description The is a high-bandwidth, low-dropout, 3.0A voltage regulator ideal for powering core voltages of lowpower microprocessors. The
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3mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator General Description The is designed for portable RF and wireless applications with demanding performance and space requirements. The performance is optimized
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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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RT92 5mA, Low Dropout, Low Noise Ultra-Fast With Soft Start CMOS LDO Regulator General Description The RT92 is a high-performance, 5mA LDO regulator, offering extremely high PSRR and ultra-low dropout,
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RT9055 300mA Dual LDO Regulator General Description The RT9055 is a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The output voltage range is from 0.9V to 3.5V
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50mA Low-Noise LDO Regulator Product Description The GS265 is an efficient linear voltage regulator with ultra low-noise output, very low dropout voltage (typically 7mV at light loads and 65mV at 50mA),
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