RT4532WSC datasheet(4/12 Pages) RICHTEK

4 / 12 page

RT4532

www.richtek.com

DS4532-01 August 2015

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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Input Power Supply

Input Supply Voltage

VIN

2.5

5.5

VIN Quiescent Current

PWM, No Switching

0.6

Shutdown Current

ISHDN

VIN = 4.2V, EN = GND

A

Under-Voltage Lockout

Threshold

VUVLO

VIN Falling, Check IQ < 200A

2.3

Under-Voltage Lockout

Hysteresis

VUVLO

After UVLO, VIN Rising,

Until IQ > 200µA

150

Backlight LED Current Source

Accuracy of Output Current ILED_ACC

FB1, FB2 = 0.15V, IFB1 = IFB2 = 20mA

5

Matching of Output Current

ILED_MAT

FB1, FB2 = 0.15V, IFB1 = IFB2 = 20mA

3

Oscillator and Timing

Operating Frequency

fSW

Reg0x03 [6] = 1

0.88

1.1

1.32

MHz

Maximum Duty Cycle

DMAX

FB1 = FB2 = 0V, check MAX duty

Brightness Ramp Rate

TRAMP

Reg0x03 [5:0] = 111111

209.72 262.14 314.58

Absolute Maximum Ratings

(Note 1)



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

−0.3V to 6V



Boost Output Voltage, VOUT -------------------------------------------------------------------------------------------

−0.3V to 26V



Switching Voltage, LX ----------------------------------------------------------------------------------------------------

−0.3V to 26V



Current Source Voltage, FB1, FB2 ------------------------------------------------------------------------------------

−0.3V to 26V



Other Pins, EN, PWM, SCL, SDA ------------------------------------------------------------------------------------

−0.3V to 6V



Power Dissipation, PD @ TA = 25

°C

WL-CSP-10B 0.87x2.07 (BSC) ---------------------------------------------------------------------------------------- 1W



Package Thermal Resistance (Note 2)

WL-CSP-10B 0.87x2.07 (BSC),

θJA ---------------------------------------------------------------------------------- 99.6°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

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

(VIN = 3.6V, CIN = 10

μF, COUT = 1μF, L = 10μH, TA = 25°C, unless otherwise specified)

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