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LTC3785-1
(Rev.:RevA)

10V, High Efficiency, Buck-Boost Controller with Power Good

Linear Technology 

LTC3785-1

ABSOLUTE MAXIMUM RATINGS

(Note 1)

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

VBST1 Voltage............................................. –0.3V to 16V

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

VBST2 Voltage............................................. –0.3V to 16V

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

Peak Driver Output Current < 10μs

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

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

Operating Temperature Range (Note 2).... –40°C to 85°C

Junction Temperature ........................................... 125°C

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

PIN CONFIGURATION

TOP VIEW

24 23 22 21 20 19

RUN/SS 1

VC 2

FB 3

VSENSE 4

ILSET 5

CCM 6

18 ISSW1

17 BG1

16 VDRV

25

15 BG2

14 ISSW2

13 SW2

7 8 9 10 11 12

UF PACKAGE

24-LEAD (4mm s 4mm) PLASTIC QFN

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

LTC3785EUF-1#PBF

LTC3785EUF-1#TRPBF 37851

24-Lead (4mm × 4mm) Plastic QFN

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/

TEMPERATURE RANGE

–40°C to 85°C

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

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

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

VIN Supply

Input Operating Voltage

l 2.7

10

V

Quiescent Current—Burst Mode Operation

Quiescent Current—Shutdown

Quiescent Current—Active

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

RUN/SS = 0V, ISVOUT = 3.6V

MODE = 0V (Note 4)

86

200

μA

15

25

μA

0.8

1.5

mA

Error Amp

Feedback Voltage

(Note 5)

l 1.200 1.225 1.25

V

Feedback Input Current

1

500

nA

Error Amp Source Current

–500

μA

Error Amp Sink Current

900

μA

Error Amp AVOL

90

dB

37851fa

2

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