RT9953 datasheet(7/19 Pages) RICHTEK

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RT9953

DS9953-02 April 2011

www.richtek.com

Electrical Characteristics

(VDDM = 3.3V, TA = 25

°C, unless otherwise specified)

Absolute Maximum Ratings

(Note 1)

Supply Voltage, VDDM, PVDD5 -------------------------------------------------------------------------------------- 0.3V to 7V

Power Switch :

LX1, LX2, LX3, LX4-------------------------------------------------------------------------------------------------------

−0.3V to 6.5V

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

−0.3V to 6.5V

Power Dissipation, PD @ TA = 25

°C

WQFN 24L 4x4 ----------------------------------------------------------------------------------------------------------- 1.852W

Package Thermal Resistance (Note 2)

WQFN 24L 4x4,

θJA ----------------------------------------------------------------------------------------------------- 54°C/W

WQFN 24L 4x4,

θJC -----------------------------------------------------------------------------------------------------7°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

Recommended Operating Conditions

(Note 4)

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

−40°C to 125°C

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

−40°C to 85°C

Parameter

Symbol

Test Conditions

Min

Typ

M ax

Unit

Supply Voltage

VDDM Operating Voltage

VDDM

2.7

5.5

VDDM Startup Voltage

VST

1.5

VDDM Over Voltage Protection

5.7

6.25

PVDD5 Operating Voltage

VPVDD5

2.5

5.5

Supply Current

Shutdown Supply Current into VDDM

IOFF

All EN = 0

0.1

µA

CH1 (Syn Step-Up) : Supply Current

into VDDM

IQ1

Non Switching, EN1 = 3.3V

800

µA

CH2 (Syn Step-Up or Syn

Step-Down) : Supply Current into

VDDM

IQ2

Non Switching, EN2 = 3.3V

800

µA

CH3 (Syn Step-Down) :

Supply Current into VDDM

IQ3

Non Switching, EN3 = 3.3V

800

µA

CH4 (Syn Step-Down) :

Supply Current into VDDM

IQ4

Non Switching, EN4 = 3.3V

800

µA

CH5 (LDO) :

Supply Current into PVDD5

IQ5

EN5 = 3.3V, IOUT = 0mA

130

µA

To be continued

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