LTC3621/LTC3621-2

4

Rev. D

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ELECTRICAL CHARACTERISTICS The

l

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TJ = 25°C. (Note 3) VIN = 12V, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Operating Voltage

2.7

17

V

VOUT

Operating Voltage

0.6

VIN

V

IVIN

Input Quiescent Current

Shutdown Mode, VRUN = 0V

Burst Mode Operation

Forced Continuous Mode (Note 4), VFB

< 0.6V

0.1

3.5

1.5

1.0

7

µA

µA

mA

VFB

Regulated Feedback Voltage

LTC3621/LTC3621-2

l

0.594

0.591

0.6

0.6

0.606

0.609

V

V

IFB

FB Input Current

LTC3621/LTC3621-2

10

nA

VOUT

Regulated Fixed Output Voltage

LTC3621-3.3/LTC3621-23.3

l

3.267

3.250

3.3

3.3

3.333

3.350

V

V

LTC3621-5/LTC3621-25

l

4.950

4.925

5.0

5.0

5.050

5.075

V

V

IFB(VOUT)

Feedback Input Leakage Current

Fixed Output Versions

2

10

µA

ΔVLINE(REG) Reference Voltage Line Regulation

VIN = 2.7V to 17V (Note 5)

0.01

0.015

%/V

ΔVLOAD(REG) Output Voltage Load Regulation

(Note 5)

0.1

%

ILSW

NMOS Switch Leakage

PMOS Switch Leakage

0.1

0.1

1

1

µA

µA

RDS(ON)

NMOS On-Resistance (Bottom FET)

VIN = 5V

0.15

Ω

PMOS On-Resistance (Top FET)

0.37

Ω

DMAX

Maximum Duty Cycle

VFB = 0.5V, VMODE/SYNC = 1.5V

l

100

%

tON(MIN)

Minimum On-Time

60

ns

VRUN

RUN Input High Threshold

RUN Input Low Threshold

0.3

1.0

V

V

IRUN

RUN Input Current

VRUN = 12V

0

20

nA

VMODE/SYNC Pulse-Skipping Mode

Burst Mode Operation

Forced Continuous Mode

VINTVCC – 0.4

1.0

0.3

VINTVCC – 1.2

V

V

V

IMODE/SYNC MODE/SYNC Input Current

0

20

nA

tSS

Internal Soft-Start Time

0.8

ms

ILIM

Peak Current Limit

(E/I-Grade)

(H-Grade)

l

l

1.44

1.30

1.2

1.60

1.76

1.80

1.80

A

A

A

VUVLO

VINTVCC Undervoltage Lockout

VIN Ramping Up

2.4

2.6

2.7

V

VUVLO(HYS) VINTVCC Undervoltage Lockout Hysteresis

250

mV

VOVLO

VIN Overvoltage Lockout Rising

l

18

19

20

V

VOVLO(HYS) VIN Overvoltage Lockout Hysteresis

300

mV