LTC1643H Просмотр технического описания (PDF) - Linear Technology

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LTC1643H

PCI-Bus Hot Swap Controller

Linear Technology 

LTC1643L/LTC1643L-1/LTC1643H

PIN FUNCTIONS

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.

BLOCK DIAGRAM

ON/ON 5

FAULT 6

PWRGD 7

Q3

Q4

5VIN 5VSENSE

13 12

+–

5VOUT

+

–

2.5V

UVL

9.5V

UVL

Q1

Q9

GATE

11

Q5

3VSENSE 3VIN

10

9

12VIN

3VOUT

+–

50µA

200µA

2.5V

UVL

LOGIC

12VIN

REF

20µA

Q2

3VOUT 5VOUT

3 14

Q8

Q7

CP3

CP4 REF

REF

+ CP7

–

Q6

+ CP5

Q10

–

REF

1

12VIN

16 LTC1643H/LTC1643L 4

12VOUT

ONLY

TIMER

2

VEEIN

15

VEEOUT

LTC1643H/LTC1643L 8 GND

ONLY

1643 BD

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.

8

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