1 MIC5156/5157/5158 Micrel, Inc. MIC5156/5157/5158. Super LDO Regulator Controller General Description either , , or 12V. The MIC5158 can be con gured as a xed 5V Controller or programmed to any voltage from The MIC5156, MIC5157, and MIC5158 Super Low-Dropout to 36V using two external resistors. (LDO) Regulator Controllers are single IC solutions for high- current low-dropout linear voltage regulation. Super LDO The MIC5156 is available in an 8-pin DIP or SOIC. The regulators have the advantages of an external N-channel MIC5157 and MIC5158 are available in a 14-pin DIP or SOIC. power MOSFET as the linear pass element. which operate from 40 C to +85 C. The MIC5156/7/8 family features a dropout voltage as low as the RDS(ON) of the external power MOSFET multiplied by the output current. The output current can be as high as the Features largest MOSFETs can provide.
2 Typical operating current The MIC5156/7/8 family operates from 3V to 36V. The <1 A typical standby current MIC5156 requires an external gate drive supply to provide Low external parts count the higher voltage needed to drive the gate of the external Optional current limit (35mV typical threshold). MOSFET. The MIC5157 and MIC5158 each have an inter- 1% initial output voltage tolerance in most con gurations nal charge pump tripler to produce the gate drive voltage. 2% output voltage tolerance over temperature The tripler is capable of providing enough voltage to drive a Fixed output voltages of , (MIC5156). logic-level MOSFET to output from a supply and Fixed output voltages of , , 12V (MIC5157). is clamped to above the supply voltage. The tripler Programmable ( to 36V) with 2 resistors (MIC5156/8). requires three external capacitors.
3 Internal charge pump voltage tripler (MIC5157/8). 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 voltage of 8% or more below nominal output. A shutdown Applications (low) signal to the TTL-compatible enable control reduces Ultrahigh current ultralow dropout voltage Regulator Controller supply current to less than 1 A while forcing the Constant high-current source output voltage to ground. Low parts count to computer supply The and controllers have inter- Low noise/low-dropout SMPS post Regulator nally xed output voltages. The MIC5156 [adjustable] output High-current, current-limited switch is con gured using two external resistors.
4 The MIC5157 is a xed output Controller which is externally con gured to select Typical Applications +12V. F. F Enable F. Shutdown 4 3 2 1 7 6 5 4 3 2 1. VP. VC. 5. E. C. C. G. 3. G. F. F. MIC5157. C . VD. VD. G. D. G. C. S. D. E. S. 5 6 7 8 8 9 10 11 12 13 14. F Enable VIN 3m VOU T 3m Shutdown VOU T. VIN. 5V RS , 10A ( ) RS , 10A. CL* CL*. 47 F 47 F. 47 F 47 F. RS = /I LIMIT RS = /I LIMIT. *Improves transient *Improves transient SMP60N03-10L response to load changes IRLZ44 (Logic Level MOSFET) response to load changes 10A 5V to 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 August 2005 1 MIC5156/5157/5158. MIC5156/5157/5158 Micrel, Inc. Ordering Information MIC5156. Part Number Temperature Standard Pb-Free Voltage Range Package 40 C to +85 C 8-pin DIP.
5 40 C to +85 C 8-pin DIP. MIC5156BN MIC5156YN Adj 40 C to +85 C 8-pin DIP. 40 C to +85 C 8-pin SOIC. 40 C to +85 C 8-pin SOIC. MIC5156BM MIC5156YM Adj 40 C to +85 C 8-pin SOIC. Ordering Information MIC5157. Part Number Temperature Standard Pb-Free Voltage Range Package MIC5157BN MIC5157YN Selectable 40 C to +85 C 14-pin DIP. MIC5157BM MIC5157YM Selectable 40 C to +85 C 14-pin SOIC. Ordering Information MIC5158. Part Number Temperature Standard Pb-Free Voltage Range Package MIC5158BN MIC5158YN 40 C to +85 C 14-pin DIP. MIC5158BM MIC5158YM 40 C to +85 C 14-pin SOIC. Pin Con guration MIC5156. EN 1 8 S (Source) EN 1 8 EA. FLAG 2 7 D (Drain) FLAG 2 7 D (Drain). GND 3 6 G (Gate) GND 3 6 G (Gate). VP 4 5 VD D VP 4 5 VD D. MIC5157 MIC5158. 5V 1 14 E N EA 1 14 E N. 2 13 S (Source) 5V FB 2 13 S (Source). FLAG 3 12 D (Drain) FLAG 3 12 D (Drain).
6 GND 4 11 G (Gate) GND 4 11 G (Gate). VC P 5 10 VD D VC P 5 10 VD D. C2 6 9 C1 C2 6 9 C1 . C2+ 7 8 C1+ C2+ 7 8 C1+. MIC5156/5157/5158 2 August 2005. MIC5156/5157/5158 Micrel, Inc. Pin Description MIC5156. Pin Number Pin Name Pin Function 1 EN Enable (Input): TTL high enables Regulator ; TTL low shuts down Regulator . 2 FLAG Output Flag (Output): Open collector output is active (low) when VOUT is more than 8% below nominal output. Circuit has 3% hysteresis. 3 GND Circuit ground. 4 VP N-channel Gate Drive Supply Voltage: User supplied voltage for driving the gate of the external MOSFET. 5 VDD Supply Voltage (Input): Supply voltage connection. Connect sense resis- tor (RS) to VDD if current limiting used. Connect supply bypass capacitor to ground near device. 6 G Gate (Output): Drives the gate of the external MOSFET. 7 D Drain and Current Limit (Input): Connect to external MOSFET drain and ex- ternal sense resistor (current limit), or connect to VDD and external MOSFET.
7 Drain (no current limit). 8 ( , 5V) S Source (Input): Top of internal resistive divider chain. Connect directly to the load for best load regulation. 8 (adjustable) EA Error Ampli er (Input): Connect to external resistive divider. Pin Description MIC5157, MIC5158. Pin Number Pin Name Pin Function 1 (MIC5157) 5V 5V Con guration (Input): Connect to S (source) pin for 5V output. 1 (MIC5158) EA Error Ampli er (Input): Connect to external resistive divider to obtain adjust- able output. 2 (MIC5157) Con guration (Input): Connect to S (source) pin for output. 2 (MIC5158) 5V FB 5V Feedback (Input): Connect to EA for xed 5V output. 3 FLAG Output Voltage Flag (Output): Open collector is active (low) when VOUT is 8%. or more below its nominal value. 4 GND Circuit ground. 5 VCP Voltage Tripler Output [Filter Capacitor]. Connect a 1 to 10 F capacitor to ground.
8 6 C2 Charge Pump Capacitor 2: Second stage of internal voltage tripler. Connect a F capacitor from C2+ to C2 . 7 C2+ Charge Pump Capacitor 2: See C2 pin 6. 8 C1+ Charge Pump Capacitor 1: First stage of internal voltage tripler. Connect a F capacitor from C1+ to C1 . 9 C1 Charge Pump Capacitor 1: See C1+ pin 8. 10 VDD Supply Voltage (Input): Supply voltage connection. Connect sense resis- tor (RS) to VDD if current limiting used. Connect supply bypass capacitor to ground near device. 11 G Gate (Output): Connect to External MOSFET gate. 12 D Drain and Current Limit (Input): Connect to external MOSFET drain and ex- ternal sense resistor (current limit), or connect to VDD and external MOSFET. drain (no current limit). 13 (MIC5157) S Source and Con guration: Top of internal resistor chain. Connect to source of external MOSFET for , 5V, and 12V operation.
9 Also see and 5V pin descriptions. 13 (MIC5158) S Source (Input): Top of internal resistor chain. Connect to top of external resis- tive divider and source of external MOSFET. 14 EN Enable (Input): TTL high enables Regulator ; TTL low shuts down Regulator . August 2005 3 MIC5156/5157/5158. MIC5156/5157/5158 Micrel, Inc. Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2). Supply Input (VDD).. +38V Ambient Temperature Range (TA). Enable Input (VEN) .. to 36V MIC515xBM/BN .. 40 C to +85 C. Gate Output (VG) MIC5156 .. +55V Junction Temperature (TJ) .. +150 C. Charge Pump Node (VCP) MIC5157/8 .. +55V Thermal Resistance ( JA). Source Connection (VS) .. to +36V Package MIC5156 MIC5157/8. DIP .. 100 C/W .. 90 C/W. Flag (VFLAG) .. to +40V. SOIC .. 160 C/W .. 120 C/W. Storage Temperature (TS) .. 65 C to +150 C. Lead Temperature (soldering 10 sec.)
10 300 C. Electrical Characteristics(Note 5). VDD = 5V, VEN = 5V; TA = 25 C; unless noted. Symbol Parameter Condition Min Typ Max Units VDD Supply Voltage 3 36 V. IDD(ON) Supply Current MIC5156 Operating, VEN = 5V 10 mA. IDD(OFF) Shutdown, VEN = 0V 5 A. IDD(ON) Supply Current MIC5157/8 Operating, VEN = 5V 10 mA. IDD(OFF) Shutdown, VEN = 0V 5 A. VIH Enable Input Threshold High V. VIL Low V. EN IB Enable Input Bias Current VEN = 20 25 A. VCP Max. Charge Pump Voltage VCP VDD, VDD > 10V V. fCP Charge Pump Frequency 160 kHz VOUT MAX Maximum Gate Drive Voltage VSOURCE = 0V. (MIC5157/8) VDD = 5 9 V. VDD = 5V 9 15 V. VDD = 12V 24 28 30 V. VOUT MIN Minimum Gate Drive Voltage VSOURCE > VOUT(NOM) V. VLIM Current Limit Threshold VDD VD @ ILIM 28 35 42 mV. VS Source Voltage Short G (gate) to (S) source, Note 4. V. V. MIC5157, pin to S pin ( con g.)