LTC1646IGN Просмотр технического описания (PDF) - Linear Technology

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LTC1646IGN

CompactPCI Dual Hot Swap Controller

Linear Technology 

BLOCK DIAGRA

5VIN

5VSENSE

12

11

5VOUT

+– +

55mV

+–

–

+

150mV

+– –

2.5V

UVL

OFF/ON 15

FAULT 3

Q7

PWRGD 4

Q6

RESETIN 16

5Vin

5µA

TIMER 2

Q5

GATE

10

VGG

13µA

Q1

200µA

LOGIC

6

GND

LTC1646

3VOUT

3VSENSE

9

3VIN

8

55mV

150mV

3VOUT 5VOUT

7

5

Q2

Q3

2.5V

UVL

CP3

REF

CP4

1 RESETOUT

REF

Q4

1V

14

DRIVE

13

PRECHARGE

1646 BD

APPLICATIO S I FOR ATIO

Hot Circuit Insertion

When a circuit board is inserted into a live CompactPCI

(CPCI) slot, the supply bypass capacitors on the board can

draw huge supply transient currents from the CPCI power

bus as they charge up. The transient currents can cause

glitches on the power bus, causing other boards in the

system to reset.

The LTC1646 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 CPCI slot without

glitching the system power supplies. The chip also pro-

tects the supplies from shorts, precharges the bus I/O pins

during insertion and extraction and monitors the supply

voltages.

The LTC1646 is specifically designed for CPCI applica-

tions where the chip resides on the plug-in board.

LTC1646 Feature Summary

1. Allows safe board insertion and removal from a CPCI

backplane.

2. Controls 5V and 3.3V CPCI supplies.

3. Current limit during power-up: the supplies are allowed

to power up in current limit. This allows the chip to

power up boards with widely varying capacitive loads

without tripping the circuit breaker. The maximum

allowable power-up time is programmable using the

TIMER pin and an external capacitor.

9

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