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LTC3785-1

37851f

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage (VIN)......................... –0.3V to 11V

ISVOUT, ISVIN .............................................. –0.3V to 11V

SW1, SW2, ISSW1, ISSW2 Voltage:

DC............................................................. –1V to 11V

Pulsed, <1μs ............................................. –2V to 12V

RUN/SS, MODE, CCM, VDRV, VCC Voltages ...... –0.3V to 6V

PGOOD Voltage............................................ –0.3V to 6V

TG1, VBST1 Voltages................................... –0.3V to 16V

With Respect to SW1............................... –0.3V to 6V

TG2, VBST2 Voltages................................... –0.3V to 16V

With Respect to SW2............................... –0.3V to 6V

BG1, BG2 Voltage ........................................ –0.3V to 6V

Peak Driver Output Current < 10μs

(TG1, TG2, BG1, BG2).................................................3A

VCC Average Output Current.................................100mA

Operating Temperature Range.................. –40°C to 85°C

Storage Temperature Range................... –65°C to 125°C

(Note 1)

24 23 22 21 20 19

TOP VIEW

UF PACKAGE

24-LEAD (4mm

4mm) PLASTIC QFN

10 11 12

RUN/SS

VSENSE

ILSET

CCM

ISSW1

BG1

VDRV

BG2

ISSW2

SW2

TJMAX = 125°C, θJA = 37°C/W 4 LAYER BOARD

EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC3785EUF-1#PBF

LTC3785EUF-1#TRPBF

37851

24-Lead (4mm

× 4mm) Plastic QFN

–40°C to 85°C

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

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/

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Supply

Input Operating Voltage

2.7

Quiescent Current—Burst Mode Operation

VC = 0V, MODE = 3.6V (Note 4)

200

μA

Quiescent Current—Shutdown

RUN/SS = 0V, VOUT = 0V

μA

Quiescent Current—Active

MODE = 0V (Note 4)

0.8

1.5

Error Amp

Feedback Voltage

(Note 5)

1.200

1.225

1.25

Feedback Input Current

(Note 5)

500

Error Amp Source Current

–500

μA

Error Amp Sink Current

900

μA

Error Amp AVOL

VCC Regulator

VCC Maximum Regulating Voltage

VIN = 5V, IVCC = –20mA

4.15

4.35

4.55

VCC Regulation Voltage

VIN = 3.6V, IVCC = –20mA

3.3

3.5

3.6

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

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = VOUT = VDRV = VBST1 = VBST2 = 3.6V, RT = 49.9k, RILSET = 59k.

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