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SP6125
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
300kHz Constant Frequency Operation
0.6V Reference Voltage
SP6125
6 PinTSOT
1% output setpoint accuracy
Lead Free, RoHS Compliant Package:
Small 6 pin TSOT
1
V IN
2
GATE
3
VDR
DESCRIPTION
The SP6125 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, 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
high side driver is designed to drive the gate 5V below V IN . The programmable overcurrent
protection is based on high-side MOSFET’s ON resistance sensing and allows setting the
overcurrent protection value up to 300mV threshold (measured from V IN -LX). The SP6125 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
FDS4685
C1
4.7uF
C2
4.7uF
24V
1
Vin
Gate
GND
L1, IHLP-2525CZ
LX
Rs 2k
8.2uH, 68mOhm, 4A
VOUT
C6
0.1uF
6
3
SP6125
Ds
MBRA340T3G
RZ
2K
R1
C4
22uF
C5
22uF
3.3V
0-3A
VDR
CZ
300k, 1%
VFB
4
47pF
GND
GND
R2
5
SHDN
High=Of f
D1 1N4148
66.5k, 1%
Jan28-08 RevG
SP6125: TSOT-6 PFET Buck Controller
1
? 2007 Exar Corporation
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