MIC5158YM TR Microchip

MIC5156/5157/5158 Micrel, Inc. MIC5156/5157/5158 Super LDO Regulator Controller either 3.3V, 5.0V, or 12V. The MIC5158 can be congured General Description as a xed 5V controller or programmed to any voltage from The MIC5156, MIC5157, and MIC5158 Super Low-Dropout 1.3V to 36V using two external resistors. (LDO) Regulator Controllers are single IC solutions for high- The MIC5156 is available in an 8-pin DIP or SOIC. The current low-dropout linear voltage regulation. Super LDO MIC5157 and MIC5158 are available in a 14-pin DIP or SOIC Regulators have the advantages of an external N-channel which operate from 40C to +85C. power MOSFET as the linear pass element. The MIC5156/7/8 family features a dropout voltage as low as the R of the external power MOSFET multiplied by DS(ON) Features the output current. The output current can be as high as the 4.5mA typical operating current largest MOSFETs can provide. <1A typical standby current The MIC5156/7/8 family operates from 3V to 36V. The Low external parts count MIC5156 requires an external gate drive supply to provide Optional current limit (35mV typical threshold) the higher voltage needed to drive the gate of the external 1% initial output voltage tolerance in most congurations MOSFET. The MIC5157 and MIC5158 each have an inter- 2% output voltage tolerance over temperature nal charge pump tripler to produce the gate drive voltage. Fixed output voltages of 3.3V, 5.0V (MIC5156) The tripler is capable of providing enough voltage to drive a Fixed output voltages of 3.3V, 5.0V, 12V (MIC5157) logic-level MOSFET to 3.3V output from a 3.5V supply and Programmable (1.3 to 36V) with 2 resistors (MIC5156/8) is clamped to 17.5V above the supply voltage. The tripler Internal charge pump voltage tripler (MIC5157/8) requires three external capacitors. Enable pin to activate or shutdown the regulator The regulator output is constant-current limited when the Internal gate-to-source protective clamp controller detects 35mV across an optional external sense All versions available in DIP and SOIC resistor. An active-low open-collector ag indicates a low Applications voltage of 8% or more below nominal output. A shutdown (low) signal to the TTL-compatible enable control reduces Ultrahigh current ultralow dropout voltage regulator controller supply current to less than 1A while forcing the Constant high-current source output voltage to ground. Low parts count 5.0V to 3.3V computer supply Low noise/low-dropout SMPS post regulator The MIC5156-3.3 and MIC5156-5.0 controllers have inter- High-current, current-limited switch nally xed output voltages. The MIC5156 adjustable output is congured using two external resistors. The MIC5157 is a xed output controller which is externally congured to select Typical Applications +12V 1.0F 0.1F Enable 0.1F Shutdown 4 3 2 1 7 6 5 4 3 2 1 MIC5156-3.3 MIC5157 5 6 7 8 8 9 10 11 12 13 14 0.1F Enable 3m 3m Shutdown V V V IN OUT OUT V IN 5V 3.3V, 10A 3.3V, 10A R R (3.61Vmin.) S C * S C * L L 47F 47F 47F 47F R = 0.035V /I R = 0.035V /I S LIMIT S LIMIT *Improves transient *Improves transient SMP60N03-10L response to load changes IRLZ44 (Logic Level MOSFET) response to load changes 10A 5V to 3.3V Desktop Computer Regulator 10A Low-Dropout Voltage Regulator Super LDO is a trademark of Micrel, Inc. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5156/5157/5158 Micrel, Inc. Ordering Information MIC5156 Part Number Temperature Standard Pb-Free Voltage Range Package MIC5156-3.3BN MIC5156-3.3YN 3.3V 40C to +85C 8-pin DIP MIC5156-5.0BN MIC5156-5.0YN 5.0V 40C to +85C 8-pin DIP MIC5156BN MIC5156YN Adj 40C to +85C 8-pin DIP MIC5156-3.3BM MIC5156-3.3YM 3.3V 40C to +85C 8-pin SOIC MIC5156-5.0BM MIC5156-5.0YM 5.0V 40C to +85C 8-pin SOIC MIC5156BM MIC5156YM Adj 40C to +85C 8-pin SOIC Ordering Information MIC5157 Part Number Temperature Standard Pb-Free Voltage Range Package MIC5157BN MIC5157YN Selectable 40C to +85C 14-pin DIP MIC5157BM MIC5157YM Selectable 40C to +85C 14-pin SOIC Ordering Information MIC5158 Part Number Temperature Standard Pb-Free Voltage Range Package MIC5158BN MIC5158YN 5.0V/Adj 40C to +85C 14-pin DIP MIC5158BM MIC5158YM 5.0V/Adj 40C to +85C 14-pin SOIC Pin Conguration MIC5156 MIC5156-x.x EN 1 8 EA EN 1 8 S (Source) FLAG 2 7 D (Drain) FLAG 2 7 D (Drain) GND 3 6 G (Gate) GND 3 6 G (Gate) V 4 5 V V 4 5 V P D D D D P MIC5157 MIC5158 5V 1 14 EN EA 1 14 EN 3.3V 2 13 S (Source) 5V FB 2 13 S (Source) FLAG 3 12 D (Drain) FLAG 3 12 D (Drain) GND 4 11 G (Gate) GND 4 11 G (Gate) V 5 10 V V 5 10 V C P D D C P D D C2 6 9 C1 C2 6 9 C1 C2+ 7 8 C1+ C2+ 7 8 C1+ MIC5156/5157/5158 2 August 2005