SP6127EK1-L

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 3 GATE 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 C1 4.7uF Q1 Si2343DS 12V 2 1 Gate GND Vin L1, IHLP-2525CZ 3.3uH, 30mOhm, 6A Rs=1k VOUT LX C7 0.1uF 6 SP6127 Ds MBRA340T3G 3 C4 22uF RZ 2K VDR 1.8V 0-2.0A R1 200k, 1% CZ 33pF 4 GND VFB GND R2 100k, 1% 5 D1 1N4148 SHDN High=Of f Jan28-08 RevE SP6127 TSOT-6 PFET Buck Controller Page 1  2007 Exar Corporation ABSOLUTE MAXIMUM RATINGS 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 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. ____________________________________________ ELECTRICAL SPECIFICATIONS Specifications are for TAMB=TJ=25°C, and those denoted by ♦ apply over the full operating range, -40°C< Tj