RT9271 datasheet(4/15 Pages) RICHTEK

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RT9271

DS9271-13 March 2007

www.richtek.com

Electrical Characteristics

(VCC = 3.6V, TA = 25°C, unless otherwise specified.)

Absolute Maximum Ratings

(Note 1)

Supply Voltage, VCC --------------------------------------------------------------------------------------------------

−0.3V to 7V

LX, OVP -----------------------------------------------------------------------------------------------------------------

−0.3V to 21V

The Other Pins ---------------------------------------------------------------------------------------------------------

−0.3V to 7V

Power Dissipation, PD @ TA = 25

°C

SOT-23-6 ---------------------------------------------------------------------------------------------------------------- 0.4W

Package Thermal Resistance (Note 4)

SOT-23-6,

θJA ----------------------------------------------------------------------------------------------------------- 250°C/W

Maximum Junction Temperature ----------------------------------------------------------------------------------- 125

°C

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

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

−65°C to 150°C

ESD Susceptibility (Note 2)

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

MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions

(Note 3)

Supply Voltage, VCC -------------------------------------------------------------------------------------------------- 2.4V to 6V

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

−40°C to 125°C

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

System Supply Input

Under Voltage Lock Out

UVLO

1.8

2.2

2.3

Maximum Output Voltage

Supply Current

ICC1

VCC=6V, Continuously Switching

Quiescent Current

ICC2

VCC=6V, FB=1.3V, No Switching

120

μA

Shut Down Current

ICC3

VCC=6V, VEN<0.4V

0.1

μA

Oscillator

Operation Frequency

FOSC

0.9

1.1

1.3

MHz

Maximum Duty Cycle

Dmax

Reference Voltage

Feedback Voltage

VFB

0.237

0.25

0.263

MOSFET

On Resistance of MOSFET

Rds(on)

0.5

0.75

1.0

Current Limit

Imax1

Normal Operation

800

900

1000

Current Limit

Imax2

Start up Condition

500

625

750

Control and Protection

Shut Down Voltage

VEN1

0.4

0.8

Enable Voltage

VEN2

0.8

1.4

EN Pin Pull Low Current

IEN

μA

OVP Threshold (Note 5)

OVP

14.5

15.5

20.0

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