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LTC3872

3872fa

TEMPERATURE (˚C)

–60

1.22

1.23

1.24

3872 G01

1.21

1.20

–20

–40

100

1.19

1.18

1.25

VIN (V)

1.1990

1.1995

1.2005

1.2010

1.2015

1.2025

3872 G02

1.2000

1.2020

RUN VOLTAGE (V)

1.5

2.0

2.5

4.0

3872 G03

1.0

0.5

0.5 1.0 1.5 2.0 2.5 3.0 3.5

4.5 5.0

VIN = 2.5V

VIN = 3.3V

VIN = 5V

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 LTC3872E is guaranteed to meet performance speciﬁcations

from 0°C to 85°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.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Oscillator Frequency

Normal Operation

VFB = 1.2V

500

550

650

kHz

Gate Drive Rise Time

CLOAD = 3000pF

Gate Drive Fall Time

CLOAD = 3000pF

Peak Current Sense Voltage

IPRG = GND (Note 6)

IPRG = Float

IPRG = VIN

●

145

240

100

170

270

120

195

290

Default Internal Soft-Start Time

1ms

The

● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 4.2V unless otherwise noted. (Note 2)

ELECTRICAL CHARACTERISTICS

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

dissipation PD according to the following formula:

TJ = TA + (PD • 110°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 LTC3872 is tested in a feedback loop which servos VFB to

the reference voltage with the ITH pin forced to the midpoint of its voltage

range (0.7V ≤ VITH ≤ 1.9V, midpoint = 1.3V).

Note 6: Rise and fall times are measured at 10% and 90% levels.

TYPICAL PERFOR A CE CHARACTERISTICS

FB Voltage vs Temperature

FB Voltage Line Regulation

ITH Voltage vs RUN/SS Voltage

TA = 25°C unless otherwise noted.

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