Step Down Controller - Sipex Corporation
Description
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SP6127
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 900kHz 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
SP6127
6 PinTSOT
1
VIN
2
GATE
3
VDR
__________________________________________________________ DESCRIPTION
The SP6127 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 VIN, 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 highside driver is designed to drive the gate 5V below VIN.
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 6pin TSOT package making it the smallest controller available capable of operating from 24VDC supplies.
_______________________________________ TYPICAL APPLICATION CIRCUIT
VIN
Q1 Si2343DS 2 1 Vin Rs=1k LX C7 0.
1uF 6 L1, IHLP-2525CZ 3.
3uH, 30mOhm, 6A Gate C1 4.
7uF
12V
GND VOUT
C4 22uF R1 200k, 1% 4 CZ 33pF R2 100k, 1% D1 1N4148
SP6127
3 VDR
Ds MBRA340T3G
RZ 2K
1.
8V 0-2.
0A
VFB GND 5 SHDN High=Of f
GND
June 26, 2007
SP6127 TSOT-6 PFET Buck Controller Page 1
2007 Sipex 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………………………...
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