RT9284B20PJ6 datasheet(4/14 Pages) RICHTEK

Part #	RT9284B20PJ6

Description	Tiny Package, High Performance, Constant Current Switching Regulator for White LED

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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RT9284A/B

www.richtek.com

DS9284A/B-05 August 2007

Absolute Maximum Ratings (Note 1)

Supply Input Voltage ------------------------------------------------------------------------------------------------------

−0.3V to 7V

LX Input Voltage -----------------------------------------------------------------------------------------------------------

−0.3V to 22V

OVP Voltage ----------------------------------------------------------------------------------------------------------------

−0.3V to 22V

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

−0.3V to 6V

Power Dissipation, PD @ TA = 25

°C

TSOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.455W

TSOT-23-6 ------------------------------------------------------------------------------------------------------------------- 0.455W

Package Thermal Resistance

(Note 4)

TSOT-23-5,

θJA ------------------------------------------------------------------------------------------------------------- 220°C/W

TSOT-23-6,

θJA ------------------------------------------------------------------------------------------------------------- 220°C/W

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

°C

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

°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 Input Voltage ------------------------------------------------------------------------------------------------------ 2.7V to 5.5V

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

−40°C to 125°C

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

−40°C to 85°C

Electrical Characteristics

To be continued

(VIN = 3.7V, TA = 25

°C unless otherwise specified)

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

System Supply Input

Operation voltage Range

VDD

2.7

--

5.5

V

Under Voltage Lock Out

VDD

1.8

2.2

2.5

V

Quiescent Current

IDD

FB = 1.5V, No switch

50

300

1000

uA

Supply Current

IDD

FB = 0V, Switch

0.1

2

3

mA

Shut Down Current

IDD

VEN < 0.4V

--

1

uA

Line Regulation

VIN : 3.0~4.3V

--

3

--

%

Oscillator

Operation Frequency

fOSC

0.9

1.2

1.5

MHz

Maximum Duty Cycle

85

--

%

Dimming Frequency

100

--

100k

Hz

Reference Voltage

RT9284A

1.173

1.235

1.296

V

Feedback Voltage

(Note 5)

RT9284B

0.237

0.25

0.263

V

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