PM6680 데이터 시트보기 (PDF) - STMicroelectronics

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PM6680

No Rsense dual step-down controller with adjustable voltages for notebook system power

STMicroelectronics 

PM6680

No Rsense dual step-down controller with adjustable voltages

for notebook system power

Features

■ 6 V to 28 V input voltage range

■ Adjustable output voltages

■ 5 V always voltage available deliver 100 mA

peak current

■ 1.237 V ± 1% reference voltage available

■ Lossless current sensing using low side

MOSFETs RDS(on)

■ Negative current limit

■ Soft-start internally fixed at 2ms

■ Soft output discharge

■ Latched OVP and UVP

■ Selectable pulse skipping at light loads

■ Selectable minimum frequency (33 kHz) in

pulse skip mode

■ 4 mW maximum quiescent power

■ Independent power good signals

■ Output voltage ripple compensation

Applications

■ Notebook computers

■ Tablet PC or slates

■ Mobile system power supply

■ 3-4 cells Li+ battery powered devices

VFQFPN-32 5X5

Description

PM6680 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 33kHz is selectable to avoid audio

noise issues. The PM6680 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 5.5 V

and from 0.9 V to 3.3 V respectively.

Table 1. Device summary

Order codes

Package

PM6680

PM6680TR

VFQFPN-32 5mm x 5mm (Exposed pad)

Packaging

Tray

Tape and reel

January 2008

Rev 7

1/49

www.st.com

49

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