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PM6681A

Dual synchronous step-down controller with adjustable LDO

STMicroelectronics 

PM6681A

Dual synchronous step-down controller with adjustable LDO

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' RDS(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

Applications

■ Embedded computer system

■ FPGA system power

■ Industrial applications on 24 V

■ High performance and high density DC-DC

modules

■ Notebook computer

VFQFPN-32 (5 mm x 5 mm)

Description

PM6681A is a dual step-down controller

specifically designed to provide extremely high

efficiency conversion, with 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

the DC voltage error due to the output ripple.

Pulse skipping technique increases efficiency at

very light load. Moreover a minimum switching

frequency of 33 kHz is selectable to avoid audio

noise issues. The PM6681A provides a selectable

switching frequency, allowing three different

values of switching frequencies for the two

switching sections. The output voltages OUT1

and OUT2 can be adjusted from 0.9 V to 5 V and

from 0.9 V to 3.3 V respectively. The device

provides also 2 LDOs, 5 V fixed and 0.9 V - 3.3 V

adjustable.

Table 1.

Order codes

Order codes

PM6681A

PM6681ATR

Package

VFQFPN-32 (5 mm x 5 mm)

exposed pad

Packaging

Tray

Tape and reel

June 2008

Rev 3

1/47

www.st.com

47

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