RT8272 Ver la hoja de datos (PDF) - Richtek Technology

Número de pieza

componentes Descripción

Fabricante

RT8272

3A, 24V, 1.2MHz Step-Down Converter

Richtek Technology 

Function Block Diagram

VIN

VCC

1µA

Internal

Regulator

Oscillator

1.2MHz/440kHz

Current Sense

Slope Comp Amplifier

+

-

10k

EN

VA VCC

-

Foldback

Control

1V +

0.5V +

3V

Shutdown

Comparator

-

UV

VCC

Comparator

+

Logic

-

Current

10µA

Comparator

0.92V +

SS

+EA

-

Gm = 680µA/V

FB

COMP

RT8272

VA

BOOT

SW

GND

Absolute Maximum Ratings (Note 1)

z Supply Voltage, VIN ----------------------------------------------------------------------------------------- −0.3V to 26V

z Switching Voltage, SW ------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)

z BOOT Voltage ------------------------------------------------------------------------------------------------ (VSW − 0.3V) to (VSW + 6V)

z All Other Pins Voltage -------------------------------------------------------------------------------------- −0.3V to 6V

z Power Dissipation, PD @ TA = 25°C

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

z Package Thermal Resistance (Note 2)

SOP-8 (Exposed Pad), θJA -------------------------------------------------------------------------------- 75°C/W

z Junction Temperature --------------------------------------------------------------------------------------- 150°C

z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------- 260°C

z Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 150°C

z ESD Susceptibility (Note 3)

HBM (Human Body Mode) --------------------------------------------------------------------------------- 2kV

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

Recommended Operating Conditions (Note 4)

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

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

z Junction Temperature Range ------------------------------------------------------------------------------ −40°C to 125°C

z Ambient Temperature Range ------------------------------------------------------------------------------ −40°C to 85°C

DS8272-02 March 2011

www.richtek.com

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