June 26, 2007

SP6127 TSOT-6 PFET Buck Controller

 2007 Sipex Corporation

Page 1

FEATURES

Wide 4.5V – 29V Input Voltage Range

Internal compensation

Built-in High-Current PMOS Driver

Adjustable Overcurrent Protection

Internal soft start

900kHz Constant Frequency Operation

0.6V Reference Voltage

1% output setpoint accuracy

Lead Free, RoHS Compliant Package:

Small 6-pin TSOT

applications. By using a PMOS driver, this device is capable of operating at 100% duty cycle. The high-

based on the high-side MOSFET’s ON resistance sensing and allows setting the overcurrent protection

value up to 300mV threshold (measured between VIN-LX). The SP6127 is available in a space-saving 6-

pin TSOT package making it the smallest controller available capable of operating from 24VDC supplies.

High=Of f

L1, IHLP-2525CZ

3.3uH, 30mOhm, 6A

C4

22uF

Ds

MBRA340T3G

R1

200k, 1%

RZ

2K

R2

100k, 1%

Q1

Si2343DS

CZ

33pF

C7

0.1uF

C1

4.7uF

Rs=1k

D1 1N4148

SHDN

12V

VIN

VOUT

GND

GND

VFB

Vin

GND

VDR

1.8V

0-2.0A

Gate

LX

SP6127

1

5

3

2

6

4

High-Voltage, Step-Down Controller in TSOT6

SP6127

6

5

4

1

2

3

SP6127

6 PinTSOT

GND

LX

GATE

FB

VDR