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SP6127
High-Voltage, Step-Down Controller in TSOT6
FEATURES
Wide 4.5V – 29V Input Voltage Range
Internal compensation
LX
6
GND
5
FB
4
Built-in High-Current PMOS Driver
Adjustable Overcurrent Protection
Internal soft start
900kHz Constant Frequency Operation
0.6V Reference Voltage
1% output setpoint accuracy
SP6127
6 PinTSOT
Lead Free, RoHS Compliant Package:
Small 6-pin TSOT
1
V IN
2
GATE
3
VDR
__________________________________________________________ DESCRIPTION
The SP6127 is a PWM controlled step down (buck) voltage mode regulator with V IN feedforward and
internal Type-II compensation. It operates from 4.5V to 29V V IN , making it suitable for 5V, 12V and 24V
applications. By using a PMOS driver, this device is capable of operating at 100% duty cycle. The high-
side driver is designed to drive the gate 5V below V IN . The programmable overcurrent protection is
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.
_______________________________________ TYPICAL APPLICATION CIRCUIT
VIN
2
Q1
Si2343DS
C1
4.7uF
12V
1
Vin
Gate
GND
L1, IHLP-2525CZ
LX
Rs=1k
3.3uH, 30mOhm, 6A
VOUT
C7
0.1uF
6
3
SP6127
VDR
Ds
MBRA340T3G
RZ
2K
R1
C4
22uF
1.8V
0-2.0A
200k, 1%
CZ
VFB
4
33pF
GND
GND
R2
5
SHDN
High=Of f
D1 1N4148
100k, 1%
Jan28-08 RevE
SP6127 TSOT-6 PFET Buck Controller
Page 1
? 2007 Exar Corporation
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