LT3434_15 datasheet(2/24 Pages) LINER

Part #	LT3434

Description	High Voltage 3A, 200kHz Step-Down Switching Regulator with 100쨉A Quiescent Current

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3434

2

3434fb

(Note 1)

VIN, SHDN, BIAS, PGOOD, SW ............................... 60V

BOOST Pin Above SW ............................................ 35V

BOOST Pin Voltage ................................................. 68V

SYNC, CSS, PGFB, FB ................................................ 6V

Operating JunctionTemperature Range

LT3434EFE (Note 2) ........................ – 40

°C to 125°C

LT3434IFE (Note 2) ......................... – 40

°C to 125°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ORDER PART

NUMBER

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LT3434EFE

LT3434IFE

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V,

CSS/SYNC = 0V unless otherwise noted.

TJMAX = 125°C, θJA = 45°C/W, θJC(PAD) = 10°C/W

EXPOSED PAD IS GND (PIN 17)

MUST BE SOLDERED TO GND (PIN 8)

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF

Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VSHDN

SHDN Threshold

1.15

1.3

1.45

V

ISHDN

SHDN Input Current

SHDN = 12V

●

520

µA

Minimum Input Voltage (Note 3)

●

2.4

3

V

IVINS

Supply Shutdown Current

SHDN = 0V, BOOST = 0V, FB/PGFB = 0V

0.1

2

µA

Supply Sleep Current (Note 4)

BIAS = 0V, FB = 1.35V

●

170

250

µA

FB = 1.35V

●

45

75

µA

IVIN

Supply Quiescent Current

BIAS = 0V, FB = 1.15V

3.2

6

mA

BIAS = 5V, FB = 1.15V

2.6

5

mA

Minimum BIAS Voltage (Note 5)

FB = 1.15V

●

2.7

3.1

V

IBIASS

BIAS Sleep Current (Note 4)

●

110

180

µA

IBIAS

BIAS Quiescent Current

SYNC = 3.3V

700

900

µA

Minimum Boost Voltage (Note 6)

ISW = 3A

1.8

V

Input Boost Current (Note 7)

ISW = 3A

65

85

mA

VREF

Reference Voltage (VREF)

3.3V < VVIN < 60V

● 1.225

1.25

1.275

V

IFB

FB Input Bias Current

75

200

nA

EA Voltage Gain (Note 8)

900

V/V

EA Voltage gm

dI(VC)= ±10µA

400

650

900

µMho

EA Source Current

FB = 1.15V

20

40

55

µA

EA Sink Current

FB = 1.35V

15

30

40

µA

VC to SW gm

6A/V

FE PART

MARKING

3434EFE

3434IFE

FE PACKAGE

16-LEAD PLASTIC TSSOP

1

2

3

4

5

6

7

8

TOP VIEW

16

15

14

13

12

11

10

9

NC

SW

VIN

SW

BOOST

CT

GND

PGOOD

SHDN

SYNC

PGFB

FB

VC

BIAS

CSS

17

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LT3434 Datasheet(PDF) 2 Page - Linear Technology

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