LTC1871 datasheet(2/36 Pages) LINER

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LTC1871

(Note 1)

VIN Voltage ............................................... – 0.3V to 36V

INTVCC Voltage ........................................... – 0.3V to 7V

INTVCC Output Current ........................................ 50mA

GATE Voltage ........................... – 0.3V to VINTVCC + 0.3V

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

RUN, MODE/SYNC Voltages ....................... – 0.3V to 7V

FREQ Voltage ............................................– 0.3V to 1.5V

SENSE Pin Voltage ................................... – 0.3V to 36V

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

Junction Temperature (Note 3) ............................ 125

°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

LTC1871EMS

TJMAX = 125°C, θJA = 120°C/ W

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

MS PART MARKING

LTSX

RUN

ITH

FREQ

MODE/

SYNC

SENSE

VIN

INTVCC

GATE

GND

TOP VIEW

MS PACKAGE

10-LEAD PLASTIC MSOP

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loop

VIN(MIN)

Minimum Input Voltage

2.5

Input Voltage Supply Current

(Note 4)

Continuous Mode

VMODE/SYNC = 5V, VFB = 1.4V, VITH = 0.75V

550

1000

µA

Burst Mode Operation, No Load

VMODE/SYNC = 0V, VITH = 0.2V (Note 5)

250

500

µA

Shutdown Mode

VRUN = 0V

µA

VRUN

Rising RUN Input Threshold Voltage

1.348

VRUN–

Falling RUN Input Threshold Voltage

1.223

1.248

1.273

1.198

1.298

VRUN(HYST)

RUN Pin Input Threshold Hysteresis

100

150

IRUN

RUN Input Current

160

VFB

Feedback Voltage

VITH = 0.2V (Note 5)

1.218

1.230

1.242

1.212

1.248

IFB

FB Pin Input Current

VITH = 0.2V (Note 5)

∆VFB

Line Regulation

2.5V

≤ VIN ≤ 30V

0.002

0.02

%/V

∆VIN

∆VFB

Load Regulation

VMODE/SYNC = 0V, VTH = 0.5V to 0.90V (Note 5)

–1

–0.1

∆VITH

∆VFB(OV)

∆FB Pin, Overvoltage Lockout

VFB(OV) – VFB(NOM) in Percent

2.5

Error Amplifier Transconductance

ITH Pin Load = ±5µA (Note 5)

650

µmho

VITH(BURST)

Burst Mode Operation ITH Pin Voltage

Falling ITH Voltage (Note 5)

0.3

VSENSE(MAX) Maximum Current Sense Input Threshold

Duty Cycle < 20%

120

150

180

ISENSE(ON)

SENSE Pin Current (GATE High)

VSENSE = 0V

µA

ISENSE(OFF)

SENSE Pin Current (GATE Low)

VSENSE = 30V

0.1

µA

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN = VINTVCC = 5V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise specified.

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

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