LTC1643L-1CGN Datasheet

IC型號(hào)：
LTC1643L-1CGN
PDF描述：
PCI-Bus Hot Swap Controller
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LTC1643L/LTC1643L-1/LTC1643H

PCI-Bus Hot Swap

Controller

FEATURES

DESCRIPTIO

Allows Safe Board Insertion and Removal from a

Live PCI Slot

Works on either a Motherboard (LTC1643H) or

CompactPCI

Card (LTC1643L/LTC1643L-1)

Controls 鈥?2V, 3.3V, 5V, 12V Supplies

Programmable Foldback Current Limit with

Circuit Breaker

User-Programmable Supply Voltage Power-Up Rate

High Side Drive for External N-Channels

鈥?2V and 12V On-Chip Switches

Fault and Power-Good Outputs

APPLICATIO S

PCI-Based Servers

CompactPCI Compliant Boards

, LTC and LT are registered trademarks of Linear Technology Corporation.

Hot Swap is a trademark of Linear Technology Corporation.

CompactPCI is a trademark of PCI Industrial Computer Manufacturing Group.

The LTC

廬

1643 is a Hot Swap

controller that allows a board

to be safely inserted and removed from a live PCI-Bus slot.

Two external N-channel transistors control the 3.3V and 5V

supplies while on-chip switches control the 鈥?2V and 12V

supplies. All supply voltages can be ramped up at a program-

mable rate. An electronic circuit breaker protects all four

supplies against overcurrent faults. The foldback current limit

feature limits current spikes and power dissipation when

shorts occur and allows boards with large capacitances to be

powered up without tripping the circuit breaker. The PWRGD

output indicates when all of the supply voltages are within

tolerance and the FAULT output indicates an overcurrent

condition. The ON(LTC1643H)/ON (LTC1643L/LTC1643L-1)

pin is used to cycle the board power or reset the circuit

breaker. The LTC1643L-1 has the

鹵12V

power good com-

parators disabled.

The LTC1643 is available in a 16-pin narrow SSOP package.

TYPICAL APPLICATION

Hot Swappable PCI Supply

0.007鈩?/div>

IRF7413

0.005鈩?/div>

IRF7413

10鈩?/div>

SYSTEM

POWER

SUPPLY

GND

12V

EEIN

PCI

POWER

SYSTEM

CONTROLLER

RESET

10k

10鈩?/div>

SENSE

OUT

100鈩?/div>

0.047碌F

SENSE

GATE

OUT

12V

OUT

LTC1643H

EEOUT

FAULT

TIMER

PWRGD

3.3V

7.6A

GND

0.1碌F

12V

500mA

鈥?2V

100mA

LOGIC

RESET

1643 TA01

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LTC1643L-1CGN Datasheet

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