12

LT4250L/LT4250H

4250lhf

PART NUMBER

DESCRIPTION

COMMENTS

LTC

Dual Hot Swap Controller with Additional –12V Control

Operates from 3V to 12V

LTC1422

Hot Swap Controller in SO-8

System Reset Output with Programmable Delay

LT1640AH/LT1640AL

–48V Hot Swap Controller in SO-8

LT4250 is a Pin-Compatible Upgrade to LT1640

LT1641-1/LT1641-2

+48V Hot Swap Controller in SO-8

Foldback Current Limit, 9V to 80V, Auto-Retry/Latch-Off

LTC1642

Fault Protected Hot Swap Controller

Operates Up to 16.5V, Protected to 33V

LTC1643

PCI Hot Swap Controller

3.3V, 5V, 12V, – 12V Supplies for PCI Bus

LTC1645

Dual Hot Swap Controller

Operates from 1.2V to 12V, Power Sequencing

LTC1646

Dual CompactPCI Hot Swap Controller

3.3V, 5V Supplies with Precharge and Local PCI Reset Logic

LTC1647

Dual Hot Swap Controller

Dual ON Pins for Supplies from 3V to 15V

LTC4211

Hot Swap Controller with Multifunction Current Control

2.5V to 16.5V Supplies, Active Inrush Current Limiting

LTC4251

–48 Hot Swap Controller in SOT-23

Active Current Limiting, Fast Comparator

for Catastrophic Faults

LTC4252

–48 Hot Swap Controller in MSOP

Active Current Limiting, Fast Comparator for Catastrophic

Faults, Separate UV/0V Pins, Power-Good Output

©LINEAR TECHNOLOGY CORPORATION 2001

LT/TP 0402 2K • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

Using an EMI Filter Module

Many applications place an EMI filter module in the power

path to prevent switching noise of the module from being

injected back onto the power supply. A typical application

using the Lucent FLTR100V10 filter module is shown in

Figure 15. When using a filter, an optoisolator is required

to prevent common mode transients from destroying the

PWRGD and ON/OFF pins.

RELATED PARTS

Figure 15. Typical Application Using a Filter Module

+

LT4250L

PWRGD

SENSE

C1

470nF

25V

C2

15nF

100V

C3

0.1

µF

100V

C4

0.1

µF

100V

C6

0.1

µF

100V

C5

100

µF

100V

C7

100

µF

16V

Q1

IRF530

R2

10

Ω

5%

R3

1k

5%

R4

549k

1%

R5

6.49k

1%

R6

10k

1%

R1

0.02

Ω

5%

4

OV

–48V RTN

3

2

– 48V

UV

5

6

8

7

1

GATE

DRAIN

LUCENT

JW050A1-E

+

TRIM

–

+

9

5V

4250 F15

8

7

6

5

3

1

2

4

ON/OFF

CASE

–

+

–

+

CASE

–

+

LUCENT

FLTR100V10

–48V RTN

(SHORT PIN)

*

* DIODES INC. SMAT70A

4

3

2

1

MOC207

R7

51k

5%

1N4003