RT8249 datasheet(6/23 Pages) RICHTEK

6 / 23 page

RT8249A/B/C

DS8249A/B/C-02

June 2014

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Electrical Characteristics

Absolute Maximum Ratings

(Note 1)



VIN to GND ---------------------------------------------------------------------------------------------------------

−0.3V to 30V



BOOTx to PHASEx ----------------------------------------------------------------------------------------------

−0.3V to 6V



PHASEx to GND

DC --------------------------------------------------------------------------------------------------------------------

−0.3V to 30V

<20ns ---------------------------------------------------------------------------------------------------------------

−8V to 38V



UGATEx to PHASEx

DC --------------------------------------------------------------------------------------------------------------------

−0.3V to (LDO5 + 0.3V)

<20ns ---------------------------------------------------------------------------------------------------------------

−5V to 7.5V



LGATEx to GND

DC --------------------------------------------------------------------------------------------------------------------

−0.3V to (LDO5 + 0.3V)

<20ns ---------------------------------------------------------------------------------------------------------------

−2.5V to 7.5V



Other Pins ----------------------------------------------------------------------------------------------------------

−0.3V to 6V



Power Dissipation, PD @ TA = 25

°C

WQFN-20L 3x3 --------------------------------------------------------------------------------------------------- 3.33W



Package Thermal Resistance (Note 2)

WQFN-20L 3x3,

θJA ---------------------------------------------------------------------------------------------- 30°C/W

WQFN-20L 3x3,

θJC --------------------------------------------------------------------------------------------- 7.5°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

Recommended Operating Conditions

(Note 4)



Supply Voltage, VIN --------------------------------------------------------------------------------------------- 5V to 25V



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

−40°C to 125°C



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

−40°C to 85°C

(VIN = 12V, VEN1 = VEN2 = 3.3V, VCS1 = VCS2 = 2V, VCLK disable by 200

Ω to GND, No Load, TA = 25°C, unless otherwise

specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Input Supply

VIN Power On Reset

VIN_POR

Rising Threshold

4.6

4.9

Falling Threshold

3.2

3.7

VIN Standby Supply

Current

IVIN_SBY

RT8249A

Both Buck Controllers

Off, VEN1 = VEN2 = GND

A

RT8249B

RT8249C

VIN Quiescent Current

IVIN_nosw

Both Buck Controllers On,

VFBx = 2.05V, VBYP1 = 5.05V

A

BYP1 Supply Current

IBYP1_nosw

Both Buck Controllers On,

VFBx = 2.05V, VBYP1 = 5.05V

120

180

A

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