MIC5156 Micrel Semiconductor, MIC5156 Datasheet
MIC5156
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MIC5156 Summary of contents
Page 1
... The MIC5158 can be configured as a fixed 5V controller or programmed to any voltage from 1.3V to 36V using two external resistors. The MIC5156 is available in an 8-pin DIP or SOP. The MIC5157 and MIC5158 are available in a 14-pin DIP or SOP which operate from – +85 C. ...
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... MIC5156/5157/5158 Ordering Information MIC5156 Part Number MIC5156-3.3BN MIC5156-5.0BN MIC5156BN MIC5156-3.3BM MIC5156-5.0BM MIC5156BM Ordering Information MIC5157 Part Number MIC5157BN MIC5157BM Ordering Information MIC5158 Part Number MIC5158BN MIC5158BM Pin Configuration MIC5156-x FLAG 2 GND MIC5157 5V 1 3.3V 2 FLAG ...
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... MIC5156/5157/5158 Pin Description MIC5156 Pin Number Pin Name FLAG 3 GND (3.3V, 5V) 8 (adjustable) EA Pin Description MIC5157, MIC5158 Pin Number Pin Name 1 (MIC5157 (MIC5158 (MIC5157) 3.3V 2 (MIC5158 FLAG 4 GND C2– 7 C2+ 8 C1+ 9 C1– ...
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... LIM Short G (gate) to (S) source, Note 4 MIC5156-3.3 MIC5156-5.0 MIC5157, 3.3V pin to S pin (3.3V config.) MIC5157, 5V pin to S pin (5V config.) MIC5157 7V, (12V config.) DD MIC5158 pin to EA pin (5V config.) MIC5156 [adjustable] and MIC5158 5V < V < 15V 3.3V DD OUT % of nominal V SOURCE % of nominal V SOURCE ...
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... MIC5156/5157/5158 Typical Characteristics 3.3V Regulator Output Voltage vs. Temperature 3.34 3.33 3.32 3.31 3.30 3.29 3.28 3.27 3.26 -60 - 120 150 TEMPERATURE ( C) MIC5157/8 On-State Supply Current vs. Supply Voltage 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2 SUPPLY VOLTAGE (V) Charge-Pump Output Voltage vs. Supply Voltage SUPPLY VOLTAGE (V) Enable Threshold Voltage vs ...
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... MIC5156/5157/5158 Block Diagram MIC5156 12k +5V Input Q2 FLAG Switched 5V Load Fixed 3.3V Power Supply with 5.0V Load Switch Block Diagram MIC5157 Oscillator FLAG March 1999 +12V Input 0.1µ 1.235V Bandgap I LIMIT Reference Comparator V Error OUT Comparator Amp 75mV * fixed version only † 3.3V = 17k 32k ‡ ...
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... MOSFET is fully enhanced, an additional higher supply voltage is required to produce the necessary gate-to-source enhancement. This higher gate drive voltage is provided by an external gate drive supply (MIC5156 internal charge pump (MIC5157 and MIC5158). Gate Drive Supply Voltage (MIC5156 only) The gate drive supply voltage must not be more than 14V ...
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... Standard N-channel enhancement-mode MOSFETs are ac- ceptable for most Super LDO regulator applications. Logic-level N-channel enhancement-mode MOSFETs may be necessary if the external gate drive voltage is too low (MIC5156), or the input voltage is too low, to provide ad- equate charge pump voltage (MIC5157/8) to enhance a standard MOSFET. Circuit Layout For the best voltage regulation, place the source, ground, and error amplifier connections as close as possible to the load ...
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... Some linear regulators specify a minimum required output filter capacitance because the capacitor determines the dominant pole of the system, and thereby stabilizes the system. This is not the situation for the MIC5156/7/8; its dominant pole is determined within its error amplifier. 3-120 resistor for R2. See ...
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... The Super LDO regulator can provide a significant reduction in peak-to-peak ripple voltage. High-Current Switch Application All versions of the MIC5156/7/8 may be used for current- limited, high-current, high-side switching with or without voltage regulation. See figure (4a). Simply leave the “S” ...
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... MIC5156/5157/5158 MIC5158 GND R2 Figure 5. Battery Charger Concept Uninterruptible Power Supply The MIC5157 and two N-channel MOSFETs provide battery switching for uninterruptible power as shown in figure (6). Two MOSFETs are placed source-to-source to prevent cur- rent flow through their body diodes when switched off. The Super LDO regulator is continuously enabled to achieve fast battery switch-in ...