LT3757/LT3757A

3

Rev. G

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

ORDER INFORMATION

The l denotes the specifications which apply over the full operating temp-

erature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Operating Range

2.9

40

V

VIN Shutdown IQ

SHDN/UVLO = 0V

SHDN/UVLO = 1.15V

0.1

1

6

µA

µA

VIN Operating IQ

VC = 0.3V, RT = 41.2k

1.6

2.2

mA

VIN Operating IQ with Internal LDO Disabled

VC = 0.3V, RT = 41.2k, INTVCC = 7.5V

280

400

µA

SENSE Current Limit Threshold

l

100

110

120

mV

SENSE Input Bias Current

Current Out of Pin

–65

µA

Error Amplifier

FBX Regulation Voltage (VFBX(REG))

VFBX > 0V (Note 3)

VFBX < 0V (Note 3)

l

l

1.569

–0.816

1.6

–0.80

1.631

–0.784

V

V

FBX Overvoltage Lockout

VFBX > 0V (Note 4)

VFBX < 0V (Note 4)

6

7

8

11

10

14

%

%

FBX Pin Input Current

VFBX = 1.6V (Note 3)

VFBX = –0.8V (Note 3)

–10

70

100

10

nA

nA

Transconductance gm (∆IVC/∆VFBX)

(Note 3)

230

µS

VC Output Impedance

(Note 3)

5

MΩ

VFBX Line Regulation [∆VFBX/(∆VIN • VFBX(REG))]

VFBX > 0V, 2.9V < VIN < 40V (Notes 3, 7)

VFBX < 0V, 2.9V < VIN < 40V (Notes 3, 7)

0.002

0.0025

0.056

0.05

%/V

%/V

VC Current Mode Gain (∆VVC/∆VSENSE)

5.5

V/V

VC Source Current

VFBX = 0V, VC = 1.5V

–15

µA

VC Sink Current

VFBX = 1.7V

VFBX = –0.85V

12

11

µA

µA

Oscillator

Switching Frequency

RT = 41.2k to GND, VFBX = 1.6V

RT = 140k to GND, VFBX = 1.6V

RT = 10.5k to GND, VFBX = 1.6V

270

300

100

1000

330

kHz

kHz

kHz

RT Voltage

VFBX = 1.6V

1.2

V

Minimum Off-Time

220

ns

Minimum On-Time

220

ns

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

AUTOMOTIVE PRODUCTS**

LT3757AEMSE#WPBF

LT3757AEMSE#WTRPBF LTGGM

10-Lead (3mm × 3mm) Plastic MSOP

–40°C to 125°C

LT3757AIMSE#WPBF

LT3757AIMSE#WTRPBF

LTGGM

10-Lead (3mm × 3mm) Plastic MSOP

–40°C to 125°C

LT3757AHMSE#WPBF

LT3757AHMSE#WTRPBF LTGGM

10-Lead (3mm × 3mm) Plastic MSOP

–40°C to 150°C

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

Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These

models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your

local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for

these models.