LTC2952 Linear Technology, LTC2952 Datasheet

LTC2952

Manufacturer Part Number

LTC2952

Description

Pushbutton PowerPath Controller

Manufacturer

Linear Technology

Datasheet

1.LTC2952.pdf (30 pages)

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FEATURES

APPLICATIONS

TYPICAL APPLICATION

ADAPTER, 3V TO 25V

Pushbutton On/Off Control

Automatic Low Loss Switchover Between DC

Sources

Wide Operating Voltage Range: 2.7V to 28V

Low 25μA Shutdown Current

Guaranteed Threshold Accuracy: ±1.5% of

Monitored Voltage Over Temperature

Adjustable Pushbutton On/Off Timers

Simple Interface Allows Graceful μP Shutdown

Extendable Housekeeping Wait Time Prior to

Shutdown

200ms Reset Delay and 1.6s Watchdog Timeout

±8kV HBM ESD on PB Input

20-pin TSSOP and QFN (4mm × 4mm) Packages

Desktop and Notebook Computers

Portable Instrumentations

Cell Phones, PDA and Handheld Computers

Servers and Computer Peripherals

Battery Backup Systems

Pushbutton Controller with Automatic Switchover Between Adapter and Battery

12V BATTERY

Si6993DQ

*22nF

ONT

GND OFFT

LTC2952

Si6993DQ

G1STAT

*68nF

WDE

KILL

RST

PFO

INT

PFI

511k

100k

*OPTIONAL

LT1767-2.5

SHDN

OUT

365k

100k

DESCRIPTION

The LTC

three main functions: pushbutton on/off control of system

power, ideal diode PowerPath controllers and system moni-

toring. The LTC2952’s pushbutton input, which provides

on/off control of system power, has independently adjust-

able ON and OFF debounce times. A simple microprocessor

interface involving an interrupt signal allows for proper

system housekeeping prior to power-down.

The ideal diode PowerPath controllers provide automatic

low loss switchover between two DC sources by regulating

two external P-channel MOSFETs to have a small 20mV

forward drop.

High reliability systems may utilize the LTC2952’s monitor-

ing features to ensure system integrity. These features in-

clude: power-fail, voltage monitoring and μP watchdog.

The LTC2952 operates over a wide operating voltage range

to accommodate a large variety of input power supplies. The

part’s combination of low 20mV external MOSFET regula-

tion and very low standby current matches battery powered

and power conscious application requirements.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

2.5V

Controller with Supervisor

Pushbutton PowerPath

10k

2952 is a power management device that features

μP

2952 TA01

Ideal Diode vs Schottky Diode

0.02

IDEAL

DIODE

Forward Voltage Drop

FORWARD VOLTAGE (V)

CONSTANT

VOLTAGE

LTC2952

SCHOTTKY

DIODE

2952 TA01b

0.50

2952fa

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