TPS3631-01 datasheet(5/19 Pages) TI1

No de pièce	TPS3631-01

Description	ADJUSTABLE BATTERY-BACKUP SUPERVISOR FOR RAM RETENTION

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Fabricant	TI1 [Texas Instruments]

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TPS361301

SLVS340D − DECEMBER 2000 − REVISED JULY 2008

www.ti.com

5

detailed description

backup-battery switchover

In case of a brownout or power failure, it may be

necessary to preserve the contents of RAM. If a

backup battery is installed at VBAT, the device

automatically switches the connected RAM to

backup power when VDD fails. In order to allow the

backup battery (for example, 3.6-V lithium cells)

to have a higher voltage than VDD, these

supervisors do not connect VBAT to VOUT when

VBAT is greater than VDD. VBAT only connects to

VOUT (through a 15-Ω switch) when VDD falls

below VIT and VBAT is greater than VDD. When

VDD recovers, switchover is deferred either until

VDD crosses VBAT, or when VDD rises above the

reset threshold VIT. VOUT connects to VDD through

a 1-

Ω (max) PMOS switch when VDD crosses the

reset threshold.

VDD >VBAT

VDD >VIT

VOUT

1

VDD

1

0

VDD

0

1

VDD

0

VBAT

VDD − Mode

VBAT − Mode

VBSW Hysteresis

VIT Hysteresis

VBAT − Backup-Battery Supply Voltage

Undefined

Figure 1. VDD − VBAT Switchover

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