LTC3717-1 datasheet(2/20 Pages) LINER

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LTC3717-1

sn37171 37171fs

ORDER PART NUMBER

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

TJMAX = 125°C, θJA = 34°C/ W

EXPOSED PAD IS SGND (PIN 33) MUST BE SOLDERED TO PCB

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

QFN PART MARKING

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

VON

PGOOD

VRNG

ITH

SGND

ION

VFB

SENSE+

SENSE–

PGND

DRVCC

INTVCC

LTC3717EUH-1

37171

(Note 1)

Boosted Topside Driver Supply Voltage

(BOOST) ............................................... 42V to – 0.3V

VIN, ION, SW, SENSE+ Voltage .................. 36V to –0.3V

EXTVCC, DRVCC, RUN/SS, PGOOD,

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

VON, VREF, VRNG Voltages .......(INTVCC + 0.3V) to –0.3V

ITH, VFB Voltages...................................... 2.7V to –0.3V

TG, BG, INTVCC, EXTVCC, DRVCC Peak Currents ....... 2A

TG, BG, INTVCC, EXTVCC, DRVCC RMS Currents .. 50mA

Operating Ambient Temperature

Range (Note 4) ................................... – 40

°C to 85°C

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

°C

Storage Temperature Range ................. – 65

°C to 125°C

Reflow Peak Body Temperature ............................ 260

°C

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 15V, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Buck Regulator

IQ(VIN)

Input DC Supply Current (VIN)

Normal

1000

2000

µA

Shutdown Supply Current

VRUN/SS = 0V

µA

VFB

Feedback Voltage Accuracy

ITH = 1.2V (Note 3), VREF = 2.4V

– 0.65

0.1

0.65

∆VFB(LINE)

Feedback Voltage Line Regulation

VIN = 4V to 36V, ITH = 1.2V (Note 3)

0.002

%/V

∆VFB(LOAD)

Feedback Voltage Load Regulation

ITH = 0.5V to 1.9V (Note 3)

– 0.05

– 0.3

gm(EA)

Error Amplifier Transconductance

ITH = 1.2V (Note 3)

0.93

1.13

1.33

tON

On-Time

ION = 30µA, VON = 0V

186

233

280

ION = 60µA, VON = 0V

115

135

tON(MIN)

Minimum On-Time

ION = 180µA

100

tOFF(MIN)

Minimum Off-Time

300

400

VSENSE(MAX)

Maximum Current Sense Threshold

VRNG = 1V, VFB = VREF/2 – 50mV

108

135

162

VPGND – VSW (Source)

VRNG = 0V, VFB = VREF/2 – 50mV

114

VRNG = INTVCC, VFB = VREF/2 – 50mV

148

185

222

VSENSE(MIN)

Minimum Current Sense Threshold

VRNG = 1V, VFB = VREF/2 + 50mV

–140

–165

–190

VPGND – VSW (Sink)

VRNG = 0V, VFB = VREF/2 + 50mV

–97

–115

–133

VRNG = INTVCC, VFB = VREF/2 + 50mV

– 200

– 235

– 270

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