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SC191 Dataheets PDF



Part Number SC191
Manufacturers Semtech
Logo Semtech
Description Low Supply Ripple Synchronous Buck Conversion Regulator
Datasheet SC191 DatasheetSC191 Datasheet (PDF)

Low Supply Ripple Synchronous www.DataSheet4U.com Buck Conversion Regulator POWER MANAGEMENT Description The SC191 is a synchronous step-down converter with integrated power devices and an integrated front-end LDO regulator to minimize input supply ripple. If supply ripple is not a concern, the front-end LDO regulator can be bypassed externally to maximize efficiency. The internal MOSFET switches provide peak current greater than 550mA to achieve a DC output of at least 330mA over the rated input.

  SC191   SC191


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Low Supply Ripple Synchronous www.DataSheet4U.com Buck Conversion Regulator POWER MANAGEMENT Description The SC191 is a synchronous step-down converter with integrated power devices and an integrated front-end LDO regulator to minimize input supply ripple. If supply ripple is not a concern, the front-end LDO regulator can be bypassed externally to maximize efficiency. The internal MOSFET switches provide peak current greater than 550mA to achieve a DC output of at least 330mA over the rated input voltage range, making the SC191 ideal for single-cell Li-ion battery applications as well as fixed 3.3V and 5V fixed input applications. The output is a fixed 1.2V - ideal for low-voltage microprocessors. Other voltage options are available (consult the factory for details). Additional features include internal soft-start to limit inrush current, over-current protection, over-temperature protection, and over-voltage protection. The 1MHz switching frequency allows the use of small surface mount capacitors and inductors, and no other external compensation components are needed. The device is available in a low profile (0.8mm max height) 2.3mm x 2.3mm MLPD 8-lead package, minimizing area without compromising performance. SC191 Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Less than 1mV Supply Ripple 2.7V to 5.5V Input Range 330mA Guaranteed Output Current Fixed Frequency 1MHz Operation No Schottky Diode Required Over-Current Protection Over-Voltage Protection Over-Temperature Protection Soft-Start No External Compensation Required MLPD-8, 2.3mm x 2.3mm Package WEEE and RoHS Compliant Applications ‹ ‹ ‹ ‹ ‹ ‹ ‹ Cell Phones Cordless Phones Notebook and Subnotebook Computers PDAs and Mobile Communicators WLAN Peripherals Wireless Modules 1 Li-Ion or 3 NiMH/NiCd Powered Devices Patent Pending Typical Application Circuit VIN CIN 4.7μF 3 4 2 VIN EN PVIN SC191 LX VOUT BP 8 5 1 6 L 4.7μH VOUT COUT CBP 4.7μF 4.7μF 7 PGND GND April 12, 2006 1 www.semtech.com SC191 POWER MANAGEMENT Absolute Maximum Ratings Parameter Input Voltage Enable Input LX Voltage Output Voltage BP Voltage Thermal Impedance Junction to Ambient1 VOUT Short Circuit to GND Storage Temperature Junction Temperature Peak IR Reflow Temperature ESD Protection Level2 Symbol VVIN, VPVIN VEN VLX VVOUT VBP θJA tSC TS TJC TLEAD VESD www.DataSheet4U.com Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. Maximum -0.3 to 7.0 -0.3 to 7.0 -1 to VBP + 1 (7V max) -0.3 to 7.0 0.3 to 7.0 135 Continuous -60 to +160 +150 260 2 Units V V V V V °C/W s °C °C °C kV Notes: 1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad as per JESD51 standards. 2) Tested according to JEDEC standard JESD22-A114-B. Electrical Characteristics Unless otherwise noted: VIN = 3.6V , VEN = VIN , TA = -40°C to 85°C . Typical values are at TA = 25°C. Parameter Input Voltage Range Input Voltage Ripple Line Regulation Load Regulation P-Channel On Resistance N-Channel On Resistance Start-Up Time Output Voltage Accuracy Front End LDO (FELDO) Symbol VIN VIN (P-P) VLINEREG VLOADREG RDSP RDSN TSTART ΔVOUT VBP Conditions Min 2.7 Typ Max 5.5 Units V mV CIN = CBP = 10μF IOUT = 150mA 0mA < IOUT < 330mA ILX = 100mA ILX = 100mA IOUT = 150mA IOUT = 150mA IOUT = 150mA, TA = 25°C IBP = 110mA(1) -3 -1.5 -0.3 1 0.3 0.002 0.3 0.2 1.25 3 1.5 300 325 %/V %/mA Ω Ω ms % % mV © 2006 Semtech Corp. 2 www.semtech.com SC191 POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter P-Channel Current Limit N-Channel Current Limit Quiescent Current Shutdown Current LX Leakage Current PMOS LX Leakage Current NMOS Oscillator Frequency UVLO Threshold (Lower) UVLO Hysteresis Thermal Shutdown Thermal Shutdown Hysteresis Logic Input High Logic Input Low Logic Input Current High Logic Input Current Low Symbol ILIM(P) ILIM(N) IQ ISD ILXP ILXN fOSC VUVLO VUVLO-HYS TSD TSD-HYS VIH VIL IIH IIL EN pin EN pin EN pin EN pin -2 -2 0.1 0.1 1.6 0.6 2 2 Switching mode, IOUT = 100μA EN tied to GND VIN = 5.5V LX, EN tied to GND VIN = VLX = 5.5V EN tied to GND -20 0.87 2.4 Conditions Min 550 -270 Typ 730 -420 2.5 0.1 0.1 0.1 1.0 2.5 50 145 10 1.12 2.6 1 1 Max 940 -700 Units mA mA mA μA μA μA MHz V mV °C °C V V μA μA www.DataSheet4U.com Note: 1) FELDO tested at IBP = 110mA. Equivalent to IOUT = 330mA at VOUT= 1.2V. © 2006 Semtech Corp. 3 www.semtech.com SC191 POWER MANAGEMENT Pin Configuration www.DataSheet4U.com Ordering Information DEVICE PACKAGE MLPD-8LD (2.3mm x 2.3mm BODY SIZE) Evaluation Board TOP VIEW SC191AWLTRT(1)(2) 8 7 6 5 LX PGND GND VOUT BP PVIN VIN EN 1 2 3 4 SC191AEVB Notes: 1) Available in tape and reel only. A reel contains 3,000 devices. 2) Device is WEEE and RoHS compliant. MLPD-8 2.3mm x 2.3mm 8-lead Output Voltage Options PART SC191A VOUT 1.2V* *Only option currently available - .


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