TPS3514

SLVS422A – JULY 2003

PC POWER-SUPPLY SUPERVISORS

FEATURES

5V, and 3.3V Supplies

12V, 5V, and 3.3V Supplies

LOCKOUT: 12V Supplies

OPEN–DRAIN OUTPUT STAGE

Monitors Power–Good Signal Input 3.3V and 5V

Supplies

Turn-On Protection

DESCRIPTION

The TPS3514 is a PC switching power-supply system monitor

with minimum external components. It provides under-voltage

lockout

(UVLO),

over-voltage

(OV),

under-voltage

(UV),

over-current (OC), protection circuits, power-good indicator, and

on/off control.

UVLO thresholds are 4.45V (on) and 3.65V (off). Over-current

protection (OCP) and over-voltage protection (OVP) monitor 3.3V,

5V, and 12V supplies. When an OC or OV condition is detected,

the power–good output (PGO) is asserted LOW and the fault

protection output (FPO) is latched HIGH. PSON from

LOW-to-HIGH resets the latch. The OCP function will be enabled

75ms after PSON goes LOW with PGI HIGH and a debounce of

typically 38ms. A built-in 2.3ms delay with 38ms debounce from

PSON to FPO output is enabled at turn–off.

An external resistor is connected between the RI pin and the GND

current draw from the VS12 pin is less than 1mA.

The power–good feature monitors PGI, the 3.3V and 5V supplies,

and issues a power–good signal when the output is ready.

The TPS3514 is characterized for operation from –40

°C to 85°C.

The TPS3514 is available in DIP-14 and SO-14 packages.

PGI

GND

FPO

PSON

IS12

RI

NC

PGO

VDD

VS5

VS33

VS12

IS33

IS5

5V

3.3V

12V

TPS3514

560

Ω

56k

Ω

R2Ω

R1Ω

470k

Ω

1k

Ω

820

Ω

1.5k

Ω

0.01

Ω

0.01

Ω

0.01

Ω

IO

5V VSB

12V

5V

3.3V

5V VSB

PG

From Transformer

System Side

Power Supply

Output Side

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semiconductor products and disclaimers thereto appears at the end of this data sheet.

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All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright

 2002–2003, Texas Instruments Incorporated