LTC1643AHIGN datasheet(8/16 Pages) LINER

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LTC1643AL

LTC1643AL-1/LTC1643AH

1643afa

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

LTC1643AH/LTC1643AL

ONLY

LTC1643AH/LTC1643AL

ONLY

REF

1643A 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 LTC1643A 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 protects the PCI supplies from shorts and monitors

the supply voltages.

The LTC1643AH is designed for motherboard applica-

tions, while the LTC1643AL/LTC1643AL-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 LTC1643AH and LTC1643AL.

PIN FUNCTIONS

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

LTC1643AH and LTC1643AL.

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