Mar 29-07 RevD

SP6126: TSOT-6 PFET Buck Controller

 2007 Sipex Corporation

1

FEATURES

Wide 4.5V – 29V Input Voltage Range

Internal Compensation

Built-in High Current PMOS Driver

Adjustable Overcurrent Protection

Internal soft-start

600kHz Constant Frequency Operation

0.6V Reference Voltage

1% output setpoint accuracy

Lead Free, RoHS Compliant Package:

Small 6-Pin TSOT

DESCRIPTION

internal Type-II compensation. It operates from 4.5V to 29V making is suitable for 5V, 12V, and 24V

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

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

available in a space-saving 6-pin TSOT package making it the smallest controller available capable

of operating from 24VDC supplies.

TYPICAL APPLICATION CIRCUIT

6

5

4

1

2

3

SP6126

6 PinTSOT

GND

LX

GATE

FB

VDR

High=Of f

L1, IHLP-2525CZ

6.8uH, 60mOhm, 4.5A

C4

22uF

Ds

MBRA340T3G

R1

200k, 1%

RZ

2K

R2

44.2k, 1%

Q1

Si2343DS

CZ

62pF

C7

0.1uF

C1

10uF

Rs=1k

D1 1N4148

12V

SHDN

VIN

GND

GND

VOUT

Vin

GND

VDR

VFB

Gate

LX

SP6126

3.3V

0-2.0A

5

3

1

2

6

4

Solved by

TM

SP6126

High-Voltage, Step Down Controller in TSOT6