RT4531 datasheet(4/14 Pages) RICHTEK

4 / 14 page

RT4531

www.richtek.com

DS4531-01

July 2016

is a registered trademark of Richtek Technology Corporation.

Electrical Characteristics

Recommended Operating Conditions

(Note 4)



Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ 2.5V to 5.5V



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

−40°C to 125°C



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

−40°C to 85°C

(VIN = 3.6V, CIN = 2.2

μF, COUT = 1μF, L = 4.7μH, TA = 25°C, unless otherwise specified)

Absolute Maximum Ratings

(Note 1)



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

−0.3V to 6V



LED Switching Voltage, SW -------------------------------------------------------------------------------------------- 38V



LED Current Source Voltage, IFB1, IFB2 ----------------------------------------------------------------------------

−0.3V to 6V



Digital Clock Control Pin, EN, PWM ---------------------------------------------------------------------------------

−0.3V to 6V



Other Pins, ISET ----------------------------------------------------------------------------------------------------------

−0.3V to 6V



Power Dissipation, PD @ TA = 25

°C

WL-CSP-9B 1.35x1.35 (BSC) ------------------------------------------------------------------------------------------ 1.22W



Package Thermal Resistance (Note 2)

WL-CSP-9B 1.35x1.35 (BSC),

θJA ------------------------------------------------------------------------------------ 81.5°C/W



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

°C



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

°C



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

−65°C to 150°C



ESD Susceptibility (Note 3)

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

MM (Machine Model) ----------------------------------------------------------------------------------------------------- 200V

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Power Supply

UVLO

VUVLO

VIN falls

2.2

2.3

UVLO Hysteresis Voltage

VUVLO

VIN rises after UVLO

200

VIN Supply Current

EN = High, Non-switching

1.2

VIN Shutdown Current

ISHDN

VIN = 5V

A

Thermal Shutdown

TSD

150

C

Thermal Shutdown

Hysteresis

C

Back Light LED

Accuracy of Back Light

Output Current 1/2

AIBL1, 2

IFBx = 20mA

2

Matching of Output Current

MIBL

IFBx = 20mA

IFBx = 500A

BLED Sense Voltage 1/2

VDSBL

IFBx = 20mA, measured on

IFBx pin which has a lower

voltage.

200

300

430

Back Light Switching

Frequency

fblosc

0.88

1.12

MHz

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