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LTC3630

3630fb

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

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply (VIN)

VIN

Input Voltage Operating Range

VOUT

Output Voltage Operating Range

0.8

VIN

UVLO

VIN Undervoltage Lockout

VIN Rising

VIN Falling

Hysteresis

3.45

3.30

3.65

3.5

150

3.85

3.70

DC Supply Current (Note 5)

Active Mode

Sleep Mode

Shutdown Mode

No Load

VRUN = 0V

165

270

μA

VRUN

RUN Pin Threshold Voltage

RUN Rising

RUN Falling

Hysteresis

1.17

1.06

1.21

1.10

110

1.25

1.14

Output Supply (VFB)

VFB(ADJ)

Feedback Comparator Threshold Voltage

(Adjustable Output)

VFB Rising, VPRG1 = VPRG2 = 0V

LTC3630E, LTC3630I

LTC3630H, LTC3630MP

0.792

0.788

0.800

0.808

0.812

VFBH

Feedback Comparator Hysteresis

(Adjustable Output)

VFB Falling, VPRG1 = VPRG2 = 0V

2.5

IFB

Feedback Pin Current

VFB = 1V, VPRG1 = 0V, VPRG2 = 0V

–10

VFB(FIXED)

Feedback Comparator Threshold Voltages

(Fixed Output)

VFB Rising, VPRG1 = SS, VPRG2 = 0V

VFB Falling, VPRG1 = SS, VPRG2 = 0V

4.940

4.910

5.015

4.985

5.090

5.060

VFB Rising, VPRG1 = 0V, VPRG2 = SS

VFB Falling, VPRG1 = 0V, VPRG2 = SS

3.260

3.240

3.310

3.290

3.360

3.340

VFB Rising, VPRG1 = VPRG2 = SS

VFB Falling, VPRG1 = VPRG2 = SS

1.780

1.770

1.810

1.8

1.840

1.83

ΔVLINEREG

Feedback Voltage Line Regulation

VIN = 4V to 65V

0.001

%/V

Operation

IPEAK

Peak Current Comparator Threshold

ISET Floating

100k Resistor from ISET to GND

ISET Shorted to GND

0.45

0.09

1.2

0.6

0.12

1.4

0.75

0.15

RON

Power Switch On-Resistance

Top Switch

Bottom Switch

ISW = –200mA

ISW = 200mA

1.00

0.53

ILSW

Switch Pin Leakage Current

RUN = Open, VIN = 65V, SW = 0V

0.1

μA

ISS

Soft-Start Pin Pull-Up Current

VSS < 2.5V

μA

tINT(SS)

Internal Soft-Start Time

SS Pin Floating

0.8

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 LTC3630 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3630E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC3630I is guaranteed

over the –40°C to 125°C operating junction temperature range, the

LTC3630H is guaranteed over the –40°C to 150°C operating junction

temperature range and the LTC3630MP is tested and guaranteed over the

–55°C to 150°C operating junction temperature range.

High junction temperatures degrade operating lifetimes; operating lifetime

is derated for junction temperatures greater than 125°C. 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.

Note 3: 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 is 43°C/W for the DFN or 45°C/W for the MSOP.

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