RT9271 datasheet(4/15 Pages) RICHTEK

Part #	RT9271

Description	White LED Step-Up Converter in Tiny Package

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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RT9271

4

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

V

Maximum Output Voltage

--

20

V

Supply Current

ICC1

VCC=6V, Continuously Switching

--

2

mA

Quiescent Current

ICC2

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

50

90

120

μA

Shut Down Current

ICC3

VCC=6V, VEN<0.4V

--

0.1

1

μA

Oscillator

Operation Frequency

FOSC

0.9

1.1

1.3

MHz

Maximum Duty Cycle

Dmax

85

90

--

%

Reference Voltage

Feedback Voltage

VFB

0.237

0.25

0.263

V

MOSFET

On Resistance of MOSFET

Rds(on)

0.5

0.75

1.0

Ω

Current Limit

Imax1

Normal Operation

800

900

1000

mA

Current Limit

Imax2

Start up Condition

500

625

750

mA

Control and Protection

Shut Down Voltage

VEN1

0.4

0.8

--

V

Enable Voltage

VEN2

--

0.8

1.4

V

EN Pin Pull Low Current

IEN

--

4

6

μA

OVP Threshold (Note 5)

OVP

14.5

15.5

20.0

V

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