STMicroelectronics PM6675S

Description
The PM6675S device is a highly efficient step-down controller with an independent Low Drop-Out (LDO) linear regulator. The Constant On-Time (COT) architecture ensures fast transient response, supporting both electrolytic and ceramic output capacitors. An embedded integrator control loop compensates for the DC voltage error due to the output ripple. A selectable low-consumption mode allows for 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 Apk or ±2 Apk) 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' ROS(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