LT4220IGN datasheet(1/16 Pages) LINER

Numer części	LT4220IGN

Szczegółowy opis	Dual Supply Hot Swap Controller

PDF	16 Pages

Scroll/Zoom	100%

Producent	LINER [Linear Technology]

Strona internetowa	http://www.linear.com

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1

LT4220

4220f

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Dual Supply

Hot Swap Controller

s

Hot Swap

TM Controller for Positive

and Negative Supplies

s

Supply Tracking Mode

s

±2.7V to ±16.5V Operation

s

Analog Current Limit with Foldback

s

Allows Safe Board Insertion and Removal

from a Live Backplane

s

Open-Collector Power Good Comparators

s

Automatic Retry or Latchoff After a Current Fault

s

Dual Undervoltage Lockout Comparator Inputs

s

Current Fault Indication

s

Live Board Insertion

s

RAID Systems

s

–5.2V ECL Supplies

s

Industrial Controls

s

Split Supply Systems

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

The LT

®4220 16-pin dual voltage Hot Swap controller

allows a board to be safely inserted and removed from a

live backplane. The device operates with any combination

of 2.7V to 16.5V and –2.7V to –16.5V supplies. Using two

external N-channel pass transistors, the board supply

voltages can be ramped up at an adjustable rate. A select-

able tracking mode allows dual supply tracking control for

ramping the positive and negative supplies together.

The LT4220 features foldback current limit and latches off

both gates if either supply remains in current limit longer

than an adjustable time period. The IC can be configured

for automatic restart after a delay set by the same timer.

A power good signal indicates when the output voltages

monitored by the two FB comparators are within tolerance,

and the gate drive signals are at their full on voltage.

The LT4220 is available in a 16-lead narrow SSOP

package.

Hot Swap is a trademark of Linear Technology Corporation.

VCC

ON+

C6

1

µF

C5

1

µF

R2

4.99k

R1

36.5k

R4

4.99k

R3

36.5k

–12V

VEE

12V

VCC

FAULT

TIMER

GND

TRACK

ON–

PWRGD

FB+

R10

4.99k

R9

36.5k

12V

VOUT+

R12

4.99k

R11

36.5k

4220 TA01

–12V

VOUT–

R7

10

Ω

FB–

SENSE+

RS+

0.005

Ω

RS–

0.005

Ω

GATE+

R6

1k

R5

10

Ω

C1

10nF

R8

1k

C2

10nF

C3

100nF

Q1

SUB85N03-04

VEE

SENSE–

SENSEK

LT4220

GATE–

Q2

SUB85N03-04

CL2

CL1

Z2*

R14

10

Ω

C4

100nF

Z1*

R13

10

Ω

VIN+

VIN–

* 1SMA13AT3 TRANSIENT

VOLTAGE SUPPRESSOR

+

716

15

14

12

34

12

11

6

8

9

10

13

5

R15

20k

R16, 20k

C7

10nF

C8

10nF

D1

IN4001

D2

IN4001

±12V 10A Hot Swap Controller

12V

VIN+

12V

VOUT+

–12V

VIN–

–12V

VOUT–

TIME (10ms/DIV)

Podobny numer części - LT4220IGN

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LT4220IGN Arkusz danych(PDF) 1 Page - Linear Technology

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