RT8274 datasheet(3/12 Pages) RICHTEK

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RT8274

DS8274-01 March 2011

www.richtek.com

Function Block Diagram

Absolute Maximum Ratings (Note 1)

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

−0.3V to 26V

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

−0.3V to (VIN + 0.3V)

BOOT Voltage ------------------------------------------------------------------------------------------------ (VSW

− 0.3V) to (VSW + 6V)

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

−0.3V to 6V

Power Dissipation, PD @ TA = 25

°C

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

Package Thermal Resistance (Note 2)

SOP-8 (Exposed Pad),

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

SOP-8 (Exposed Pad),

θJC -------------------------------------------------------------------------------- 28°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)

Supply Voltage, VIN ----------------------------------------------------------------------------------------- 4.75V to 24V

Enable Voltage, VEN ----------------------------------------------------------------------------------------- 0V to 5.5V

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

−40°C to 125°C

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

−40°C to 85°C

Comparator

Oscillator

400kHz/120kHz

Foldback

Control

0.6V

Internal

Regulator

1.1V

1µA

Shutdown

Comparator

Current Sense

Amplifier

BOOT

VIN

GND

COMP

10k

VCC

Slope Comp

Current

Comparator

10µA

VCC

1.222V

Gm = 930µA/V

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