L6726ATR datasheet(9/35 Pages) STMICROELECTRONICS

9 / 35 page

L6726A

Device description

Doc ID 12754 Rev 4

9/35

Device description

L6726A is a single-phase PWM controller with embedded high-current drivers that provides

complete control logic and protections to realize in an easy and simple way a general DC-

DC step-down converter. Designed to drive N-channel MOSFETs in a synchronous buck

topology, with its high level of integration this 8-pin device allows reducing cost and size of

the power supply solution.

L6726A is designed to operate from a 5 V or 12 V supply bus. Thanks to the high precision

0.8V internal reference, the output voltage can be precisely regulated to as low as 0.8 V with

±1% accuracy over line and temperature variations (between 0 °C and +70 °C). The

switching frequency is internally set to 270 kHz.

This device provides a simple control loop with externally compensated transconductance

error-amplifier and programmable soft start. Low-side-less feature allows the device to

perform soft-start over pre-charged output avoiding negative spikes at the load side.

In order to avoid load damages, L6726A provides programmable threshold over current

protection. Output current is monitored across low-side MOSFET RdsON, saving the use of

expensive and space-consuming sense resistor. L6726A also features FB disconnection

protection, preventing dangerous uncontrolled output voltages in case of floating FB pin.

L6726ATR Scheda tecnica(PDF) 9 Page - STMicroelectronics