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LTC1871-7

18717fc

FB Voltage vs Temp

FB Voltage Line Regulation

FB Pin Current vs Temperature

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 8V, VRUN = 1.5V, RFREQ = 80k, VMODE/SYNC = 0V, unless otherwise speciﬁed.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

UVLO

INTVCC Undervoltage Lockout Threshold

Rising INTVCC

Falling INTVCC

UVLO Hysteresis

5.6

4.6

1.0

ΔVINTVCC

ΔVIN1

INTVCC Regulator Line Regulation

8V ≤ VIN ≤ 15V

ΔVINTVCC

ΔVIN2

INTVCC Regulator Line Regulation

15V ≤ VIN ≤ 30V

200

VLDO(LOAD)

INTVCC Load Regulation

0 ≤ IINTVCC ≤ 20mA, VIN = 8V

– 2

–0.2

VDROPOUT

INTVCC Regulator Dropout Voltage

VIN = 6V, INTVCC Load = 20mA

280

GATE Driver

GATE Driver Output Rise Time

CL = 3300pF (Note 7)

100

GATE Driver Output Fall Time

CL = 3300pF (Note 7)

100

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC1871E-7 is guaranteed to meet performance speciﬁcations

from 0°C to 70°C junction temperature. Speciﬁcations over the – 40°C

to 85°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC1871I-7 is guaranteed over the full –40°C to 125°C operating junction

temperature range.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • 120°C/W)

Note 4: The dynamic input supply current is higher due to power MOSFET

gate charging (QG • fOSC). See Applications Information.

Note 5: The LTC1871-7 is tested in a feedback loop that servos VFB to the

reference voltage with the ITH pin forced to a voltage between 0V and 1.4V

(the no load to full load operating voltage range for the ITH pin is 0.3V to

1.23V).

Note 6: In a synchronized application, the internal slope compensation

gain is increased by 25%. Synchronizing to a signiﬁcantly higher ratio will

reduce the effective amount of slope compensation, which could result in

subharmonic oscillation for duty cycles greater than 50%.

Note 7: Rise and fall times are measured at 10% and 90% levels.

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (°C)

–50

1.23

1.24

150

18717 G01

1.22

1.21

100

–25

125

1.25

VIN (V)

1.229

1.230

1.231

510

18717 G02

TEMPERATURE (°C)

–50

–25

100

18717 G03

125 150

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