LTC3718EG datasheet(2/20 Pages) LINER

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LTC3718

3718fa

(Note 1)

Input Supply Voltage (VIN2) .......................10V to –0.3V

Boosted Topside Driver Supply Voltage

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

VIN1, ION, SW1 Voltage ............................. 36V to –0.3V

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

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

ITH, VFB1 Voltages .................................... 2.7V to –0.3V

SW2 Voltage ............................................. 36V to – 0.4V

VFB2 Voltage ................................................. VIN2 + 0.3V

SHDN Voltage ......................................................... 10V

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

TG, BG, INTVCC 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 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ORDER PART

NUMBER

LTC3718EG

TJMAX = 125°C, θJA = 130°C/ W

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN1 = 15V, VIN2 = 1.5V unless otherwise noted.

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

TOP VIEW

G PACKAGE

24-LEAD PLASTIC SSOP

RUN/SS

VON

PGOOD

VRNG

ITH

SGND1

ION

VFB1

VREF

SHDN

SGND2

VFB2

BOOST

SW1

SENSE+

SENSE–

PGND1

INTVCC

VIN1

VIN2

PGND2

SW2

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

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Buck Regulator

IQ(VIN1)

Input DC Supply Current (VIN1)

Normal

1000

2000

µA

Shutdown Supply Current

VRUN/SS = 0V

µA

VFB1

Feedback Voltage Accuracy

ITH = 1.2V (Note 3)

– 0.65

0.1

0.65

∆VFB1(LINE)

Feedback Voltage Line Regulation

VIN1 = 4V to 36V, ITH = 1.2V (Note 3)

0.002

%/V

∆VFB1(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 = 60µA, VON = 1.5V

200

250

300

ION = 30µA, VON = 1.5V

400

500

600

tON(MIN)

Minimum On-Time

ION = 180µA

100

tOFF(MIN)

Minimum Off-Time

300

400

VSENSE(MAX)

Maximum Current Sense Threshold

VRNG = 1V, VFB1 = VREF/2 – 50mV

108

135

162

VPGND – VSW1 (Source)

VRNG = 0V, VFB1 = VREF/2 – 50mV

114

VRNG = INTVCC, VFB1 = VREF/2 – 50mV

148

185

222

VSENSE(MIN)

Minimum Current Sense Threshold

VRNG = 1V, VFB1 = VREF/2 + 50mV

–140

–165

–190

VPGND – VSW1 (Sink)

VRNG = 0V, VFB1 = VREF/2 + 50mV

–97

–115

–133

VRNG = INTVCC, VFB1 = VREF/2 + 50mV

– 200

– 235

– 270

∆VFB1(OV)

Output Overvoltage Fault Threshold

∆VFB1(UV)

Output Undervoltage Fault Threshold

– 25

VRUN/SS(ON)

RUN Pin Start Threshold

0.8

1.5

VRUN/SS(LE)

RUN Pin Latchoff Enable

RUN/SS Pin Rising

4.5

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