LTC3709 datasheet(2/24 Pages) LINER

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LTC3709

3709f

Input Supply Voltage (VCC, DRVCC) ............ 7V to – 0.3V

Boosted Topside Driver Supply Voltage

(BOOST1, BOOST2) .................................. 37V to – 0.3V

Switch Voltage (SW1, 2) ............................. 31V to – 1V

SENSE1+, SENSE2+ Voltages ....................... 31V to – 1V

SENSE1–, SENSE2– Voltages .................... 10V to – 0.3V

ION Voltage ............................................... 31V to –0.3V

(BOOST – SW) Voltages .............................. 7V to – 0.3V

RUN/SS, PGOOD Voltages .......................... 7V to – 0.3V

TRACK Voltage ............................................7V to – 0.3V

VRNG Voltage ................................. VCC + 0.3V to – 0.3V

ITH Voltage ............................................... 2.7V to – 0.3V

VFB Voltage .............................................. 2.7V to – 0.3V

INTLPF, EXTLPF Voltages ........................ 2.7V to – 0.3V

VOS+, VOS– Voltages ................................... 7V to – 0.3V

FCB Voltage ................................................ 7V to – 0.3V

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

Junction Temperature (Note 2) ............................ 125°C

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

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ORDER PART NUMBER

LTC3709EUH

EXPOSED PAD IS SGND (PIN 33)

MUST BE SOLDERED TO PCB

TJMAX = 125°C, θJA = 34°C/ W

32 31 30 29 28 27 26 25

10 11 12

TOP VIEW

UH PACKAGE

32-LEAD (5mm × 5mm) PLASTIC QFN

13 14 15 16

RUN/SS

ITH

VFB

TRACK

SGND

VOS

–

DIFFOUT

SENSE1–

PGND1

BG1

DRVCC

BG2

PGND2

SENSE2–

VCC

(Note 1)

UH PART MARKING

3709

The

● denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = DRVCC = 5V, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

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

Main Control Loop

Input DC Supply Current

Normal

2.4

Shutdown

µA

IFB

FB Pin Input Current

ITH = 1.2V (Note 3)

– 35

– 60

VFB

Feedback Voltage

ITH = 1.2V (Note 3)

●

0.594

0.600

0.606

∆VFB(LINEREG)

Feedback Voltage Line Regulation

VIN = 4V to 6.5V (Note 3)

0.02

%/V

∆VFB(LOADREG)

Feedback Voltage Load Regulation

ITH = 0.5V to 2V (Note 3)

– 0.12

– 0.2

gm(EA)

Error Amplifier Transconductance

ITH = 1.2V (Note 3)

1.3

1.45

1.6

tON

On-Time

VIN = 20V, ION = 180µA

116

140

VIN = 20V, ION = 90µA

180

233

280

tON(MIN)

Minimum On-Time

VIN = 20V, ION = 540µA

100

tOFF(MIN)

Minimum Off-Time

VIN = 20V, ION = 90µA

250

350

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