VLF10045 datasheet(4/15 Pages) RICHTEK

4 / 15 page

RT7272B

DS7272B-01

January 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Electrical Characteristics

(VIN = 12V, CIN = 20

μF, TA = 25°C, unless otherwise specified)

Absolute Maximum Ratings

(Note 1)

Supply Input Voltage, VIN -----------------------------------------------------------------------------------------

−0.3V to 40V

Switch Voltage, SW ------------------------------------------------------------------------------------------------

−0.3V to (VIN + 0.3V)

VBOOT

− VSW ---------------------------------------------------------------------------------------------------------- −0.3V to 6V

Other Pins Voltage --------------------------------------------------------------------------------------------------

−0.3V to 40V

Power Dissipation, PD @ TA = 25

°C

SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 2.041W

Package Thermal Resistance (Note 2)

SOP-8 (Exposed Pad),

θJA ---------------------------------------------------------------------------------------- 49°C/W

SOP-8 (Exposed Pad),

θJC --------------------------------------------------------------------------------------- 15°C/W

Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260

°C

Junction Temperature ----------------------------------------------------------------------------------------------- 150

°C

Storage Temperature Range --------------------------------------------------------------------------------------

−65°C to 150°C

ESD Susceptibility (Note 3)

HBM (Human Body Model) ---------------------------------------------------------------------------------------- 2kV

Recommended Operating Conditions

(Note 4)

Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- 4.5V to 36V

Junction Temperature Range --------------------------------------------------------------------------------------

−40°C to 125°C

Ambient Temperature Range --------------------------------------------------------------------------------------

−40°C to 85°C

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

VEN = 0V

0.5

μA

Quiescent Current

VEN = 3V, VFB = 0.9V

0.9

1.2

Feedback Reference

Voltage

VREF

4.5V

≤ VIN ≤ 36V

0.788

0.8

0.812

High Side Switch

On-Resistance

RDS(ON)1

150

Low Side Switch

On-Resistance

RDS(ON)2

High Side Switch Leakage

Current

VEN = 0V, VSW = 0V

μA

Upper Switch Current Limit

Range

UOC

6.3

Min. Duty Cycle, RLIM = 57.6kΩ

1.9

2.5

3.1

Min. Duty Cycle, RLIM = 84.5kΩ

2.7

3.5

4.2

Upper Switch Current Limit

UOC

(Note 5)

Min. Duty Cycle, RLIM = 137kΩ

4.5

5.5

6.5

Lower Switch Current Limit

From Drain to Source

1.5

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