LTC4269-1 datasheet(2/42 Pages) LINER

Part #	LTC4269-1

Description	Synchronous No-Opto Flyback Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC4278

2

4278fc

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

Pins with Respect to VPORTN

VPORTP Voltage......................................... –0.3V to 100V

VNEG Voltage......................................... –0.3V to VPORTP

VNEG Pull-Up Current ..................................................1A

SHDN....................................................... –0.3V to 100V

RCLASS, Voltage............................................ –0.3V to 7V

RCLASS Source Current...........................................50mA

PWRGD Voltage (Note 3)

Low Impedance Source ......VNEG –0.3V to VNEG +11V

Sink Current.........................................................5mA

PWRGD, T2P Voltage............................... –0.3V to 100V

PWRGD, T2P Sink Current.....................................10mA

Pins with Respect to GND

VCC Voltage................................................ –0.3V to 22V

SENSE–, SENSE+ Voltage........................ –0.5V to +0.5V

UVLO, SYNC Voltage...................................–0.3V to VCC

FB Current..............................................................±2mA

VCMP Current .........................................................±1mA

Operating Ambient Temperature Range

LTC4278C ................................................ 0°C to 70°C

LTC4278I..............................................–40°C to 85°C

(Notes 1, 2)

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

33

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

VPORTP

NC

PWRGD

NC

VNEG

NC

PG

PGDLY

RCMP

CCMP

SENSE+

SENSE–

UVLO

VCMP

SHDN

T2P

RCLASS

NC

VPORTN

NC

SG

VCC

tON

ENDLY

SYNC

SFST

OSC

FB

TOP VIEW

DKD32 PACKAGE

32-LEAD (7mm × 4mm) PLASTIC DFN

TJMAX = 125°C,θJA = 34°C/W, θJC = 2°C/W

GND, EXPOSED PAD (PIN 33) MUST BE SOLDERED TO A

HEAT SINKING PLANE THAT IS CONNECTED TO VNEG

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC4278CDKD#PBF

LTC4278CDKD#TRPBF

4278

32-Lead (7mm

× 4mm) Plastic DFN

0°C to 70°C

LTC4278IDKD#PBF

LTC4278IDKD#TRPBF

4278

32-Lead (7mm

× 4mm) Plastic DFN

–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

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