Step Down Controller - Sipex Corporation
Description
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SP6125
TM
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 300kHz 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
SP6125
6 PinTSOT
1
VIN
2
GATE
3
VDR
DESCRIPTION
The SP6125 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 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
Q1 FDS4685 C1 4.
7uF C2 4.
7uF
24-29 V
2 1 Vin Rs 2k LX C6 0.
1uF 6 Gate
GND
L1, IHLP-2525CZ 8.
2uH, 68mOhm, 4A
VOUT
C4 22uF R1 200k, 1% C5 22uF
SP6125
3 VDR 4 VFB GND 5
Ds MBRA340T3G
RZ 2K
3.
3V 0-3A
CZ 100pF R2 44.
2k, 1% D1 1N4148
GND
SHDN High=Of f
Mar22-07 RevC
SP6125: 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…………….
.
...
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