Features V OUT C BYP. Ultra-Low-Noise Regulator Application

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1 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 light loads and 65mV at 5mA), and very low ground current (6µA at ma output). The MIC525 offers better than % initial accuracy. Designed especially for hand-held, battery-powered devices, the MIC525 includes a CMOS or TTL compatible enable/ shutdown control input. When shut down, power consumption drops nearly to zero. Regulator ground current increases only slightly in dropout, further prolonging battery life. Key MIC525 features include a reference bypass pin to improve its already excellent low-noise performance, reversed-battery protection, current limiting, and overtemperature shutdown. The MIC525 is available in fixed and adjustable output voltage versions in a small SOT-23-5 package. For low-dropout regulators that are stable with ceramic output capacitors, see the µcap MIC5245/6/7 family. Features Ultra-low-noise output High output voltage accuracy Guaranteed 5mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reverse-battery protection Zero off-mode current Logic-controlled electronic enable Applications Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment PCMCIA V CC and V PP regulation/switching Consumer/personal electronics SMPS post-regulator/dc-to-dc modules High-efficiency linear power supplies Typical Application Enable Shutdown (pin 3) may be connected directly to IN (pin ). MIC525-x.xBM C BYP tantalum Low-Noise Operation: C BYP = 47pF, C OUT 2.2µF Basic Operation: C BYP = not used, C OUT µf Ultra-Low-Noise Regulator Application, Inc. 849 Fortune Drive San Jose, CA 953 USA tel + (48) fax + (48) July 24 MIC525

2 MIC525 Part Number Marking Accuracy Voltage Temperature Range Package Standard Pb-Free Standard Pb-Free MIC525BM5 MIC525YM5 LBAA LBAA % Adj 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB25 LB25 % 2.5V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB27 LB27 % 2.7V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB28 LB28 % 2.8V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB2J LB2J % 2.85V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB29 LB29 % 2.9V 4 C to +25 C SOT-23-5 MIC525-3.BM5 MIC525-3.YM5 LB3 LB3 % 3.V 4 C to +25 C SOT-23-5 MIC525-3.BM5 MIC525-3.YM5 LB3 LB3 % 3.V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB32 LB32 % 3.2V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB33 LB33 % 3.3V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB36 LB36 % 3.6V 4 C to +25 C SOT-23-5 MIC BM5 MIC YM5 LB38 LB38 % 3.8V 4 C to +25 C SOT-23-5 MIC525-4.BM5 MIC525-4.YM5 LB4 LB4 % 4.V 4 C to +25 C SOT-23-5 MIC525-5.BM5 MIC525-5.YM5 LB5 LB5 % 5.V 4 C to +25 C SOT-23-5 Pin Configuration 3 BYP GND IN LBxx or KBxx 4 5 OUT ADJ GND LBAA IN 4 5 OUT Part Identification Pin Description MIC525-x.xBM5 Fixed Voltages MIC525BM5 Adjustable Voltage MIC525-x.x MIC525 Pin Name Pin Function (fixed) (adjustable) IN Supply Input 2 2 GND Ground 3 3 Enable/Shutdown (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. 4 BYP Reference Bypass: Connect external 47pF capacitor to GND to reduce output noise. May be left open. 4 ADJ Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage divider. 5 5 OUT Regulator Output Absolute Maximum Ratings (Note ) Supply Input Voltage ( )... 2V to +2V Enable Input Voltage (V )... 2V to +2V Power Dissipation (P D )... Internally Limited, Note 3 Lead Temperature (soldering, 5 sec.) C Junction Temperature (T J )... 4 C to +25 C Storage Temperature (T S ) C to +5 C Operating Ratings (Note 2) Input Voltage ( ) V to +6V Enable Input Voltage (V )... V to Junction Temperature (T J )... 4 C to +25 C Thermal Resistance, SOT-23-5 (θ JA )... Note 3 MIC525 2 July 24

3 MIC525 Electrical Characteristics = + V; I L = µa; C L =.µf; V 2.V; T J = 25 C, bold values indicate 4 C T J +25 C; unless noted. Symbol Parameter Conditions Min Typical Max Units V O Output Voltage Accuracy variation from specified % 2 2 % V O / T Output Voltage Note 4 4 ppm/ C Temperature Coefficient V O /V O Line Regulation = + V to 6V.4.2 % / V.5 % / V V O /V O Load Regulation I L =.ma to 5mA, Note %.5 % V O Dropout Voltage, Note 6 I L = µa 5 mv 7 mv I L = 5mA 5 mv 23 mv I L = ma 4 25 mv 3 mv I L = 5mA mv 35 mv I GND Quiescent Current V.4V (shutdown). µa V.8V (shutdown) 5 µa I GND Ground Pin Current, Note 7 V 2.V, I L = µa 8 25 µa 5 µa I L = 5mA 35 6 µa 8 µa I L = ma 6 µa 5 µa I L = 5mA 3 9 µa 25 µa PSRR Ripple Rejection frequency = Hz, I L = µa 75 db I LIMIT Current Limit = V 32 5 ma V O / P D Thermal Regulation Note 8.5 %/W e no Output Noise I L = 5mA, C L = 2.2µF, 26 nv/ Hz 47pF from BYP to GND ABLE Input V IL Enable Input Logic-Low Voltage regulator shutdown.4 V.8 V V IH Enable Input Logic-High Voltage regulator enabled 2. V I IL Enable Input Current V IL.4V. µa V IL.8V 2 µa I IH V IH = 2.V µa V IH = 2.V 25 µa Note. Note 2. Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Exceeding the absolute maximum ratings may damage the device. The device is not guaranteed to function outside its operating ratings. The maximum allowable power dissipation at 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 MIC525- xxbm5 (all versions) is 22 C/W mounted on a PC board (see Thermal Considerations section for further details). Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 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. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at V differential. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 5mA load pulse at = 6V for t = ms. July 24 3 MIC525

4 MIC525 Typical Characteristics I OUT = µa C OUT = µf I OUT = µa -8 C BYP =.µf - RIPPLE REJECTION (db) Ripple Rejection vs. Voltage Drop 6 5 ma 4 3 ma I OUT = ma 2 C OUT = µf VOLTAGE DROP (V) I OUT = ma C OUT = µf I OUT = ma C BYP =.µf - RIPPLE REJECTION (db) Ripple Rejection vs. Voltage Drop ma ma I OUT = ma C BYP =.µf VOLTAGE DROP (V) -2-2 Turn-On Time vs. Bypass Capacitance I OUT = ma C OUT = µf I OUT = ma -8 C BYP =.µf - TIME (µs) CAPACITANCE (pf) I OUT = ma C OUT = µf - E+ E+2E+3 k E+4 k E+5 k E+6 M E+7 M I OUT = ma -8 C BYP =.µf - E+E+2 E+3 k E+4 k E+5E+6 k M E+7 M DROPOUT VOLTAGE (mv) Dropout Voltage vs. Output Current +25 C +25 C 4 C OUTPUT CURRT (ma) MIC525 4 July 24

5 MIC525 Typical Characteristics... ma C OUT = µf C BYP = nf ma, C OUT = µf... ma ma ma. C OUT = µf electrolytic.. ma ma.. C OUT = 22µF tantalum ma C BYP = nf.. ma. V ma OUT = 5V C OUT = µf. electrolytic ma C BYP = pf.. ma ma. ma C OUT = µf. electrolytic C BYP = nf.. ma. ma. C OUT = µf electrolytic ma C BYP = nf. July 24 5 MIC525

6 MIC525 Block Diagrams IN BYP OUT C OUT C BYP (optional) Bandgap VRef. REF Current Limit Thermal Shutdown MIC525-x.xBM5 GND Ultra-Low-Noise Fixed Regulator IN OUT C OUT ADJ R Bandgap VRef. REF R2 C BYP (optional) Current Limit Thermal Shutdown = V REF ( + R2/R) MIC525BM5 GND Ultra-Low-Noise Adjustable Regulator MIC525 6 July 24

7 MIC525 Applications Information Enable/Shutdown Forcing (enable/shutdown) high (> 2V) enables the regulator. is compatible with CMOS logic gates. If the enable/shutdown feature is not required, connect (pin 3) to IN (supply input, pin ). See Figure. Input Capacitor A µf capacitor should be placed from IN to GND if there is more than inches of wire between the input and the ac filter capacitor or if a battery is used as the input. Reference Bypass Capacitor BYP (reference bypass) is connected to the internal voltage reference. A 47pF capacitor (C BYP ) connected from BYP to GND quiets this reference, providing a significant reduction in output noise. C BYP reduces the regulator phase margin; when using C BYP, output capacitors of 2.2µF or greater are generally required to maintain stability. The start-up speed of the MIC525 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of C BYP. Likewise, if rapid turn-on is necessary, consider omitting C BYP. If output noise is not a major concern, omit C BYP and leave BYP open. Output Capacitor An output capacitor is required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used..µf minimum is recommended when C BYP is not used (see Figure 2). 2.2µF minimum is recommended when C BYP is 47pF (see Figure ). Larger values improve the regulator s transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency above MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at about 3 C, solid tantalums are recommended for operation below 25 C. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to.47µf for current below ma or.33µf for currents below ma. No-Load Stability The MIC525 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC525 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) TA ) P = D(max) θja T J(max) is the maximum junction temperature of the die, 25 C, and T A is the ambient operating temperature. θ JA is layout dependent; Table shows examples of junction-toambient thermal resistance for the MIC525. Package θ JA Recommended θ JA " Square θ JC Minimum Footprint Copper Clad SOT-23-5 (M5) 22 C/W 7 C/W 3 C/W Table. SOT-23-5 Thermal Resistance The actual power dissipation of the regulator circuit can be determined using the equation: P D = ( ) I OUT + 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 MIC BM5 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: P = D(max) ( ) 25 C 25 C 22 C/W P D(max) = 455mW The junction-to-ambient thermal resistance for the minimum footprint is 22 C/W, from Table. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 5mA, the maximum input voltage can be determined. From the Electrical Characteristics table, the maximum ground current for 5mA output current is 25µA or 2.5mA. 455mW = ( 3.3V) 5mA + 2.5mA 455mW = 5mA 495mW + 2.5mA 95mW = 52.5mA (max) = 6.23V Therefore, a 3.3V application at 5mA of output current can accept a maximum input voltage of 6.2V in a SOT-23-5 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. July 24 7 MIC525

8 MIC525 Fixed Regulator Applications MIC525-x.xBM pF 2.2µF Figure. Ultra-Low-Noise Fixed Voltage Application Figure includes a 47pF capacitor for low-noise operation and shows (pin 3) connected to IN (pin ) for an application where enable/shutdown is not required. minimum. Enable Shutdown MIC525-x.xBM µF Figure 2. Low-Noise Fixed Voltage Application Figure 2 is an example of a low-noise configuration where C BYP is not required. C OUT = µf minimum. Adjustable Regulator Applications The MIC525BM5 can be adjusted to a specific output voltage by using two external resistors (Figure 3). The resistors set the output voltage based on the following equation: R2 =.242V R + This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to ground and have a different equation. Resistor values are not critical because ADJ (adjust) has a high input impedance, but for best results use resistors of 47kΩ or less. A capacitor from ADJ to ground provides greatly improved noise performance. MIC525BM pF R R2 2.2µF Figure 3. Ultra-Low-Noise Adjustable Voltage Application Figure 3 includes the optional 47pF noise bypass capacitor from ADJ to GND to reduce output noise. Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. MIC525 8 July 24

9 MIC525 Package Information.9 (.75) REF.95 (.37) REF.75 (.69).5 (.59) 3. (.8) 2.6 (.2) 3.2 (.9) 2.8 (.).3 (.5).9 (.35) DIMSIONS: MM (INCH).2 (.8).9 (.4).5 (.2).35 (.4).5 (.6). (.) SOT-23-5 (M5).6 (.24). (.4) MICREL INC. 849 FORTUNE DRIVE SAN JOSE, CA 953 USA TEL + (48) FAX + (48) 474- WEB This information is believed to be accurate and reliable, however no responsibility is assumed by for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Inc. 24 Incorporated July 24 9 MIC525

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