SP6126

Nov SP6126 High-Voltage, Step Down Controller in TSOT6 LX GND FB FEATURES W ide 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 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. TYPICAL APPLICATION CIRCUIT VIN Q1 Si2343DS 2 1 Vin Rs=1k LX C7 0.1uF 6 C4 22uF R1 200k, 1% 4 VFB GND 5 D1 1N4148 SHDN High=Of f  2008 Exar Corporation C1 10uF 12V GND Gate L1, IHLP-2525CZ 6.8uH, 60mOhm, 4.5A VOUT 3.3V 0-2.0A SP6126 3 VDR Ds MBRA340T3G RZ 2K CZ 62pF R2 44.2k, 1% GND Nov07-08 RevG SP6126: TSOT-6 PFET Buck Controller 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 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