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SP6121

Sipex
Part Number SP6121
Manufacturer Sipex
Description Low Voltage / Synchronous Step Down PWM Controller
Published Jun 7, 2005
Detailed Description ® SP6121 Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters Low Voltage, Synchronous Step Down PWM Controlle...
Datasheet PDF File SP6121 PDF File

SP6121
SP6121

Overview
® SP6121 Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters Low Voltage, Synchronous Step Down PWM Controller FEATURES ■ Optimized for Single Input Voltage - 3V to 5.
5V 8 PDRV VCC 1 ■ High Efficiency: Greater than 95% possible SP6121 GND 2 7 NDRV ■ Accurate, 500kHz Fixed Frequency Operation 6 ISET VFB 3 8 Pin SOIC ■ Fast Transient Response 4 5 ISENSE COMP ■ 500µA, IQ (25µA in Shutdown) ■ Internal, 0.
4 V/ms, Soft Start Circuit ■ Precision 1% Reference Now Available in Lead Free Packaging ■ Resistor Programmable Output Voltage APPLICATIONS ■ Lossless Adjustable Current Limit with ■ Supply Bias for ■ High Side RDS(ON) Sensing - DSP ■ 0% to 100% Duty Cycle Range - Microprocessor Core ■ High Side PMOS Switch Negates Need for - I/O & Logic ■ External Charge Pump ■ Video Cards ■ Output Over Voltage Protection ■ Board Level Supply in ■ Hiccup Mode Current Limit Protection Distributed Power Systems DESCRIPTION The SP6121 is a fixed frequency, voltage mode, synchronous PWM controller designed to work from a single 5V or 3.
3V input supply, providing excellent AC and DC regulation for high efficiency power conversion.
The operating frequency is internally set at 500kHz, permitting the use of small, surface mount inductors and capacitors.
Requiring only few external components, the SP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost, small size and high efficiency are critical.
With its low voltage capability and inherent 100% duty cycle operation, the SP6121 allows low dropout operation in the event of a low input supply voltage condition.
TYPICAL APPLICATION CIRCUIT RVCC 5 ® RSET 2.
3k Q1 1.
8µH L1 Q2 DS CIN 47µF Ceramic 6.
3V 3.
3V VIN CB 3.
3µF VCC GND VFB COMP RZ 10k CZ 3.
7nF PDRV SP6121 U1 NDRV ISET ISENSE 1.
9V 8A VOUT COUT 470µF x 2 R1 5.
2k R2 10k CP 50pF Q1 = FAIRCHILD FDS6375 Q2 = FAIRCHILD FDS6690A DS = STMICROELECTRONICS STPS2L25BU Date: 5/25/04 L1 = PANASONIC ETQ-P6F1R6SFA COUT = SANYO 4TPB470M © Copyright...


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