LT1977EFE datasheet(2/24 Pages) LINER

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LT1977

1977f

(Note 1)

VIN, SHDN, BIAS ..................................................... 60V

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

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

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

Operating JunctionTemperature Range

LT1977EFE (Note 2) ........................ – 40°C to 125°C

LT1977IFE (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.

LT1977EFE

LT1977IFE

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)

FE PACKAGE

16-LEAD PLASTIC TSSOP

TOP VIEW

VIN

BOOST

GND

SHDN

SYNC

PGFB

BIAS

CSS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VSHDN

SHDN Threshold

1.15

1.3

1.45

ISHDN

SHDN Input Current

SHDN = 12V

●

520

µA

Minimum Input Voltage (Note 3)

●

2.4

IVINS

Supply Shutdown Current

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

0.1

µA

Supply Sleep Current (Note 4)

BIAS = 0V, FB = 1.35V

●

170

250

µA

FB = 1.35V

●

µA

IVIN

Supply Quiescent Current

BIAS = 0V, FB = 1.15V

4.10

BIAS = 5V, FB = 1.15V

3.25

Minimum BIAS Voltage (Note 5)

●

2.7

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 = 1.5A

1.8

Input Boost Current (Note 7)

ISW = 1.5A

VREF

Reference Voltage (VREF)

3.3V < VVIN < 60V

●

1.225

1.25

1.275

IFB

FB Input Bias Current

200

EA Voltage Gain (Note 8)

900

V/V

EA Voltage gm

dI(VC)= ±10µA

450

650

900

µMho

EA Source Current

FB = 1.15V

µA

EA Sink Current

FB = 1.35V

µA

VC to SW gm

3A/V

VC High Clamp

2.1

2.2

2.4

IPK

SW Current Limit

●

1.5

2.4

3.5

FE PART

MARKING

1977EFE

1977IFE

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