LTC1643HIGN datasheet(8/16 Pages) LINER

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LTC1643L/LTC1643L-1/LTC1643H

BLOCK DIAGRAM

–

LOGIC

9.5V

UVL

5VOUT

–

3VOUT

12VIN

µA

200

µA

ON/ON

FAULT

µA

3VSENSE

GATE

5VIN 5VSENSE

12VIN

12VOUT

VEEIN

VEEOUT

TIMER

GND

12VIN

3VIN

5VOUT

3VOUT

2.5V

UVL

2.5V

UVL

REF

LTC1643H/LTC1643L

ONLY

LTC1643H/LTC1643L

ONLY

REF

1643 BD

CP3

CP4

CP5

CP7

PWRGD

Q10

APPLICATIONS INFORMATION

Hot Circuit Insertion

When a circuit board is inserted into a live PCI slot, the

supply bypass capacitors on the board can draw huge

transient currents from the PCI power bus as they charge

up. The transient currents can cause permanent damage

to the connector pins and cause glitches on the power bus,

causing other boards in the system to reset.

The LTC1643 is designed to turn a board’s supply voltages

on and off in a controlled manner, allowing the board to be

safely inserted or removed from a live PCI slot without

glitching the system power supplies. The chip also pro-

tects the PCI supplies from shorts and monitors the

supply voltages.

The LTC1643H is designed for motherboard applica-

tions, while the LTC1643L/LTC1643L-1 are designed for

CompactPCI applications where the chip resides on the

plug-in board.

VEEOUT (Pin 15): –12V Supply Output. A 1.2Ω switch is

connected between VEEIN and VEEOUT. VEEOUT must

exceed –10.8V before the PWRGD signal can go high on

the LTC1643H and LTC1643L.

12VOUT (Pin 16): 12V Supply Output. A 0.5Ω switch is

connected between 12VIN and 12VOUT. 12VOUT must

exceed 11.4V before the PWRGD signal can go high on the

LTC1643H and LTC1643L.

PIN FUNCTIONS

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