STMicroelectronics PM6675ASTR

Description

The PM6675S device consists of a single high efficiency step-down controller and an independent Low Drop-Out (LDO) linear regulator.
The Constant On-Time (COT) architecture assures fast transient response supporting both electrolytic and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple.
A selectable low-consumption mode allows the highest efficiency over a wide range of load conditions. The low-noise mode sets the minimum switching frequency to 33 kHz for audio-sensitive applications.
The LDO linear regulator can sink and source up to 2 Apk. Two fixed current limits (±1 A-±2 A) can be chosen.
An active soft-end is independently performed on both the switching and the linear regulators outputs when disabled.

Features

■ Switching section
– 4.5 V to 28 V input voltage range
– 0.6 V, ±1 % voltage reference
– Selectable 1.5 V fixed output voltage
– Adjustable 0.6 V to 3.3 V output voltage
– 1.237 V ±1 % reference voltage available
– Very fast load transient response using constant on-time control loop
– No RSENSE current sensing using low side MOSFETs RDS(ON)
– Negative current limit
– Latched OVP and UVP
– Soft-start internally fixed at 3 ms
– Selectable pulse skipping at light load
– Selectable No-Audible (33 kHz) pulse skip mode
– Ceramic output capacitors supported
– Output voltage ripple compensation
– Output soft-end
■ LDO regulator section
– Adjustable 0.6 V to 3.3 V output voltage
– Selectable ±1 Apk or ±2 Apk current limit
– Dedicated power-good signal
– Ceramic output capacitors supported
– Output soft-end

Applications

■ Notebook computers
■ Graphic cards
■ Embedded computers