RT8279 查看數據表（PDF） - Richtek Technology

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RT8279

5A, 36V, 500kHz Step-Down Converter

Richtek Technology 

RT8279

Absolute Maximum Ratings (Note 1)

z Supply Voltage, VIN ------------------------------------------------------------------------------------------ −0.3V to 40V

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

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

z The Other Pins ------------------------------------------------------------------------------------------------ −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

SOP-8 (Exposed Pad), θJC -------------------------------------------------------------------------------- 15°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 ------------------------------------------------------------------------------------------ 5.5V to 36V

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

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

Electrical Characteristics

(VIN = 12V, TA = 25°C unless otherwise specified)

Parameter

Symbol

Reference Voltage

High Side Switch-On Resistance

Low Side Switch-On Resistance

High Side Switch Leakage

VREF

RDS(ON)1

RDS(ON)2

Current Limit

Oscillator Frequency

Short Circuit Frequency

ILIM

fOSC

Maximum Duty Cycle

Minimum On-Time

Under Voltage Lockout Threshold

Rising

DMAX

tON

Under Voltage Lockout Threshold

Hysteresis

EN Threshold

Voltage

Logic-High VIH

Logic-Low VIL

Enable Pull Up Current

Shutdown Current

Quiescent Current

Soft-Start Period

ISHDN

IQ

Thermal Shutdown

TSD

Test Conditions

5.5V ≤ VIN ≤ 36V

VEN = 0V, VSW = 0V

Duty = 90%, VBOOT−SW = 4.8V

VFB = 0V

VFB = 0.8V

EN_hys = 350mV

VEN = 0V

VEN = 2V, VFB = 1.5V

CSS = 0.1μF

Min Typ Max Unit

1.202 1.222 1.239 V

-- 110 160 mΩ

-- 10 15 Ω

--

-- 10 μA

6 7.5 9

A

425 500 575 kHz

-- 150 -- kHz

85 90 95 %

-- 100 150 ns

3.8 4.2 4.5 V

-- 315 -- mV

1.4 --

--

V

--

-- 0.4

--

1

-- μA

-- 25 45 μA

-- 0.6 1 mA

3

5 8.2 ms

-- 150 -- °C

www.richtek.com

4

DS8279-01 December 2011

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