RT9385 datasheet(4/10 Pages) RICHTEK

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RT9385

DS9385-01 April 2011

www.richtek.com

Absolute Maximum Ratings (Note 1)

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

−0.3V to 5V

Power Dissipation, PD @ TA = 25

°C

WQFN-16L 2x3 ------------------------------------------------------------------------------------------------------------ 1.111W

Package Thermal Resistance (Note 2)

WQFN-16L 2x3,

θJA ------------------------------------------------------------------------------------------------------- 90°C/W

WQFN-16L 2x3,

θJC ------------------------------------------------------------------------------------------------------ 15°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 Mode) ---------------------------------------------------------------------------------------------- 2kV

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

Electrical Characteristics

(VIN = 3.6V, VF = 3.5V, CIN = COUT = 1uF, CFLY1 = CFLY2 = 1

μF, ILED1 to LED5 = 25mA, TA = 25°C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Input Power Supply

Input Supply Voltage

VIN

2.8

4.5

Under-Voltage Lockout

Threshold

VUVLO

VIN Rising

1.8

2.5

Under-Voltage Lockout

Hysteresis

ΔVUVLO

100

Quiescent Current

x1 Mode

Shutdown Current

ISHDN

VIN = 4.5V

0.4

μA

LED Current

LED Current Accuracy

ILEDx

ILEDx = 25mA

−5

Current Matching

ILEDx = 25mA

−2

Charge Pump

Oscillator Frequency

fOSC

1000

kHz

PWM Dimming Frequency

200

kHz

Internal CF Resistance

160

Mode Decision

x1 Mode to x1.5 Mode

Transition Voltage (VIN Falling)

IOUT = 125mA, ILEDx = 25mA.

3.65

3.8

Mode Transition Hystersis

IOUT = 125mA, ILEDx = 25mA.

200

Recommended Operating Conditions

(Note 4)

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

−40°C to 125°C

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

−40°C to 85°C

To be continued

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