PM6681ATR Description

PM6681ATR is a dual step-down controller specifically designed to provide extremely high-efficiency conversion, with a lossless current sensing technique. The constant on-time architecture assures fast load transient response and the embedded voltage feed-forward provides nearly constant switching frequency operation. An embedded integrator control loop compensates for the DC voltage error due to the output ripple. The pulse-skipping technique increases efficiency at a very light load. Moreover, a minimum switching frequency of 33 kHz is selectable to avoid audio noise issues.

PM6681ATR Features

6 V to 36 V input voltage range

Adjustable output voltages

0.9- 3.3 V LDO adjustable delivers 100 mA peak current

5 V LDO delivers 100 mA peak current

1.237 V +1 % reference voltage available

No RsENSE current sensing using low-side MOSFETs' Ros(on)

Negative current limit

Soft-start internally fixed at 2 ms

Soft output discharge

Latched UVP

Not-latched OVP

Selectable pulse skipping at light loads

Selectable minimum frequency (33 kHz) in pulse skip mode

5 mW maximum quiescent power

Independent Power Good signals

Output voltage ripple compensation

PM6681ATR Applications

Embedded computer system

FPGA system power

Industrial applications on 24 V

High-performance and high-density DC-DC modules

Notebook computer