LTC3631 datasheet(3/22 Pages) LINER

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LTC3631

3631fb

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

junction temperature range, otherwise speciﬁcations are for TA = 25°C (Note 2). VIN = 10V, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply (VIN)

VIN

Input Voltage Operating Range

4.5

UVLO

VIN Undervoltage Lockout

VIN Rising

VIN Falling

Hysteresis

3.80

3.75

4.15

4.00

150

4.50

4.35

OVLO

VIN Overvoltage Lockout

VIN Rising

VIN Falling

Hysteresis

DC Supply Current (Note 3)

Active Mode

Sleep Mode

Shutdown Mode

VRUN = 0V

125

220

μA

Output Supply (VOUT/VFB)

VOUT

Output Voltage Trip Thresholds

LTC3631-3.3V, VOUT Rising

LTC3631-3.3V, VOUT Falling

3.260

3.240

3.310

3.290

3.360

3.340

LTC3631-5V, VOUT Rising

LTC3631-5V, VOUT Falling

4.940

4.910

5.015

4.985

5.090

5.060

VFB

Feedback Comparator Trip Voltage

VFB Rising

0.792

0.800

0.808

VHYST

Feedback Comparator Hysteresis

357

IFB

Feedback Pin Current

Adjustable Output Version, VFB = 1V

–10

ΔVLINEREG

Feedback Voltage Line Regulation

VIN = 4.5V to 45V

LTC3631-5, VIN = 6V to 45V

0.001

%/V

Operation

VRUN

Run Pin Threshold Voltage

RUN Rising

RUN Falling

Hysteresis

1.17

1.06

1.21

1.10

110

1.25

1.14

IRUN

Run Pin Leakage Current

RUN = 1.3V

–10

VHYSTL

Hysteresis Pin Voltage Low

RUN < 1V, IHYST = 1mA

0.07

0.1

IHYST

Hysteresis Pin Leakage Current

VHYST = 1.3V

–10

ISS

Soft-Start Pin Pull-Up Current

VSS < 1.5V

4.5

5.5

6.5

μA

tINTSS

Internal Soft-Start Time

SS Pin Floating

0.75

IPEAK

Peak Current Trip Threshold

ISET Floating

500k Resistor from ISET to GND

ISET Shorted to GND

200

225

120

280

RON

Power Switch On-Resistance

Top Switch

Bottom Switch

ISW = –25mA

ISW = 25mA

3.0

1.5

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 LTC3631 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3631E is guaranteed to meet speciﬁcations from

0°C to 85°C junction temperature. Speciﬁcations over the –40°C to

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3631I is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

consistent with these speciﬁcations is determined by speciﬁc operating

conditions in conjunction with board layout, the rated package thermal

impedance and other environmental factors. The junction temperature

(TJ, in °C) is calculated from the ambient temperature (TA, in °C) and power

dissipation (PD, in Watts) according to the formula:

TJ = TA + (PD • θJA)

where θJA (in °C/W) is the package thermal impedance.

Note 3: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

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