LTC3875_15 datasheet(2/44 Pages) LINER

2 / 44 page

LTC3875

3875fa

For more information www.linear.com/LTC3875

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN1,2 = 5V unless otherwise noted.

pin conFiguraTion

absoluTe MaxiMuM raTings

Input Supply Voltage (VIN)......................... 40V to –0.3V

Topside Driver Voltages

(BOOST1, BOOST2).................................... 46V to –0.3V

Switch Voltage (SW1, SW2).......................... 40V to –5V

INTVCC, RUN(s), PGOOD, EXTVCC

(BOOST-SW1), (BOOST2-SW2).................... 6V to –0.3V

SNSA+(s), SNSD+(s),

SNS–(s) Voltages ..................................INTVCC to –0.3V

MODE/PLLIN, ILIM, FREQ, IFAST, ENTMPB

VOSNS(s)+, VOSNS(s)– Voltages ...............INTVCC to –0.3V

ITH1, ITH2, PHASMD, TRSET1, TRSET2,

TCOMP1, TCOMP2, TAVG Voltages.......INTVCC to –0.3V

INTVCC Peak Output Current................................100mA

Operating Junction Temperature Range

(Notes 2, 3)............................................ –40°C to 125°C

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

(Note 1)

38 37 36 35 34 33 32 31

12 13 14 15

TOP VIEW

SGND/PGND

UJ PACKAGE

40-LEAD (6mm

× 6mm) PLASTIC QFN

16 17 18 19

TK/SS1

VOSNS1+

VOSNS1–

ITH1

ITH2

VOSNS2+

VOSNS2–

TK/SS2

SNSA2+

SNS2–

SW1

TG1

BOOST1

BG1

VIN

INTVCC

EXTVCC

BG2

BOOST2

TG2

TJMAX = 125°C, θJA = 33°C/W, θJC = 2.0°C/W

EXPOSED PAD (PIN 41) IS SGND/PGND, MUST BE SOLDERED TO PCB

orDer inForMaTion

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC3875EUJ#PBF

LTC3875EUJ#TRPBF

LTC3875

40-Lead (6mm

× 6mm) Plastic QFN

–40°C to 125°C

LTC3875IUJ#PBF

LTC3875IUJ#TRPBF

LTC3875

40-Lead (6mm

× 6mm) Plastic QFN

–40°C to 125°C

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

Consult LTC Marketing for information on nonstandard 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/

elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loops

VIN

Input Voltage Range

4.5

VOUT

Output Voltage Range

SNSD+ Pin to VOUT

SNSD+ Pin to GND

0.6

3.5

VOSNS1,2+

Regulated VOUT Feedback Voltage

Including Diffamp Error

(Note 4); ITH1,2 Voltage = 1.2V, –40°C to 85°C

(Note 4); ITH1,2 Voltage = 1.2V,–40°C to 125°C

0.597

0.5965

0.600

0.603

0.6045

IOSNS1,2+

Feedback Current

(Note 4)

–30

–100

VREFLNREG

Reference Voltage Line Regulation VIN = 4.5V to 38V (Note 4)

0.002 0.005

%/V

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