Step Down Controller - Sipex Corporation
Description
Solved by
SP6126
TM
High-Voltage, Step Down Controller in TSOT6
LX
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
GND
FB
6
5
4
SP6126
6 PinTSOT
1
VIN
2
GATE
3
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.
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TYPICAL APPLICATION CIRCUIT
VIN
Q1 Si2343DS 2 1 Vin Rs=1k LX C7 0.
1uF 6 L1, IHLP-2525CZ 6.
8uH, 60mOhm, 4.
5A Gate C1 10uF
12V GND VOUT
SP6126
3 VDR 4 VFB GND 5
Ds MBRA340T3G
RZ 2K R1 200k, 1% CZ 62pF R2 44.
2k, 1%
C4 22uF
3.
3V 0-2.
0A
GND
D1 1N4148 SHDN High=Of f
Mar 29-07 RevD SP6126: TSOT-6 PFET Buck Controller 2007 Sipex Corporation
1
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 Stora...
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