ltc1647-2 Linear Technology Corporation, ltc1647-2 Datasheet

ltc1647-2

Manufacturer Part Number

ltc1647-2

Description

Dual Hot Swap Controllers

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1647-2.pdf (20 pages)

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FEATURES

APPLICATIO S

3.3V V

TYPICAL APPLICATIO

SUPPLY

Allows Safe Board Insertion and Removal from a

Live Backplane

Programmable Electronic Circuit Breaker

FAULT Output Indication

Programmable Supply Voltage Power-Up Rate

High Side Drive for External MOSFET Switches

Controls Supply Voltages from 2.7V to 16.5V

Undervoltage Lockout

Hot Board Insertion

Electronic Circuit Breaker

Portable Computer Device Bays

Hot Plug Disk Drive

ON1

ON2

0.1

ON1

ON2

GND

SENSE 1

SENSE 2

LTC1647-1

1/2 MMDF3N02HD

GATE 1

GATE 2

4.7nF

R3**

R7**

** R3, R4, R7 AND R8 ARE OPTIONAL DISCHARGE

ON THE DEVICE REQUIREMENTS

RESISTORS WHEN DEVICES ARE POWERED-OFF

Q1, Q2: ON SEMICONDUCTOR

LOAD

IS USER-SELECTED BASED

Controller for Two Device Bays

LOAD

DEVICE #1

DEVICE #2

R4**

R8**

LTC1647-1/LTC1647-2/LTC1647-3

DESCRIPTIO

The LTC

Swap

serted and removed from a live backplane.

Using external N-channel MOSFETs, the board supply

voltages can be ramped up at a programmable rate. A high

side switch driver controls the MOSFET gates for supply

voltages ranging from 2.7V to 16.5V. A programmable

electronic circuit breaker protects against overloads and

shorts. The ON pins are used to control board power or

clear a fault.

The LTC1647-1 is a dual Hot Swap controller with a

common V

SO-8 package. The LTC1647-2 is similar to the LTC1647-1

but combines a fault status flag with automatic retry at the

ON pins and is also available in the SO-8 package. The

LTC1647-3 has individual V

status pins for each channel and is available in a 16-lead

narrow SSOP package.

Hot Swap is a trademark of Linear Technology Corporation.

Dual Hot Swap Controllers

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

USB PORT

1394 PHY

AND/OR

1647-1/2/3 TA01

controllers that permit a board to be safely in-

1647-1/LTC1647-2/LTC1647-3 are dual Hot

pin, separate ON pins and is available in an

GATE

OUT

pins, ON pins and FAULT

ON/OFF Sequence

5ms/DIV

1647-1/2/3 TA01a

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