SP6126
Nov
High-Voltage, Step Down Controller in TSOT6
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
LX
GND
FB
6
5
4
SP6126
6 PinTSOT
1
2
VIN
3
GATE
VDR
DESCRIPTION
The SP6126 is a PWM controlled step down (buck) voltage mode regulator with VIN 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 VIN. 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 VIN-LX). The SP6126 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
C1
10uF
Q1
Si2343DS
12V
2
1
Gate
GND
Vin
L1, IHLP-2525CZ
6.8uH, 60mOhm, 4.5A
Rs=1k
VOUT
LX
C7
0.1uF
6
SP6126
Ds
MBRA340T3G
3
C4
22uF
RZ
2K
VDR
3.3V
0-2.0A
R1
200k, 1%
CZ
62pF
4
GND
VFB
GND
R2
44.2k, 1%
5
D1 1N4148
SHDN
High=Of f
Nov07-08 RevG
SP6126: TSOT-6 PFET Buck Controller
1
2008 Exar Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only, and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect
reliability.
Input Voltage….................................................-0.3V to 30V
Lx………………………………………………….…-2V to 30V
FB……………..................................................-0.3V to 5.5V
Storage Temperature..………………...……-65 °C to 150 °C
Junction Temperature...................................-40°C to 125°C
Lead Temperature (Soldering, 10 sec)….….………..300 °C
ESD Rating……….….…1kV LX, 2kV all other nodes, HBM
ELECTRICAL SPECIFICATIONS
Specifications are for TAMB=TJ=25°C, and those denoted by ♦ apply over the full operating range, -40°C< Tj
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