IRF7821 datasheet(5/18 Pages) RICHTEK

5 / 18 page

DS8298-01

November 2011

www.richtek.com

RT8298

is a registered trademark of Richtek Technology Corporation.

Recommended Operating Conditions

(Note 4)

Supply Input Voltage, VIN ------------------------------------------------------------------------------------------ 4.5V to 24V

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

−40°C to 125°C

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

−40°C to 85°C

Absolute Maximum Ratings

(Note 1)

Supply Input Voltage, VIN ------------------------------------------------------------------------------------------ –0.3V to 26V

Switching Voltage, SW --------------------------------------------------------------------------------------------

–0.3V to (V

IN + 0.3V)

BOOT to SW ---------------------------------------------------------------------------------------------------------

–0.3V to 6V

All Other Voltage ----------------------------------------------------------------------------------------------------

−0.3V to 6V

Power Dissipation, PD @ TA = 25

°C

WDFN-14L 4x3 ------------------------------------------------------------------------------------------------------- 1.667W

SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 1.333W

Package Thermal Resistance (Note 2)

WDFN-14L 4x3,

θJA ------------------------------------------------------------------------------------------------- 60°C/W

WDFN-14L 4x3,

θJC ------------------------------------------------------------------------------------------------- 7.5°C/W

SOP-8 (Exposed Pad),

θJA ---------------------------------------------------------------------------------------- 75°C/W

SOP-8 (Exposed Pad),

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

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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

VEN = 0V

μA

Supply Current

VEN = 3V, VFB = 1V

0.9

Feedback Reference Voltage

VREF

4.5V

≤ VIN ≤ 24V

0.796 0.808

0.82

Feedback Current

IFB

VFB = 0.8V

High-Side Switch On Resistance

RDS(ON)

High-Side Switch Current Limit

BOOT

− SW = 4.8V

Oscillation Frequency

fOSC1

600

kHz

Short Circuit Oscillation Frequency

fOSC2

VFB = 0V

190

kHz

Maximum Duty Cycle

DMAX

VFB = 0.6V

Minimum On-Time

tON

VFB = 1V

100

Input Under Voltage Lockout Threshold

VUVLO

4.2

4.4

Input Under Voltage Lockout Threshold

Hysteresis

ΔVUVLO

400

Logic-High

VIH

5.5

EN Threshold

Voltage

Logic-Low

VIL

0.4

(VIN = 12V, TA = 25

°C, unless otherwise specified)

Electrical Characteristics

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