RT8294 datasheet(4/15 Pages) RICHTEK

4 / 15 page

RT8294

DS8294-02

March 2011

www.richtek.com

Absolute Maximum Ratings (Note 1)

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

−0.3V to 25V

Input Voltage, SW ------------------------------------------------------------------------------------------------

−0.3V to (VIN + 0.3V)

VBOOT

− VSW ------------------------------------------------------------------------------------------------------- −0.3V to 6V

Other Pins Voltages ----------------------------------------------------------------------------------------------

−0.3V to 6V

Power Dissipation, PD @ TA = 25°C

SOP-8 ---------------------------------------------------------------------------------------------------------------- 1.111W

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

Package Thermal Resistance (Note 2)

SOP-8,

θJA ---------------------------------------------------------------------------------------------------------- 90°C/W

SOP-8 (Exposed Pad),

θJA -------------------------------------------------------------------------------------- 75°C

SOP-8 (Exposed Pad),

θJC-------------------------------------------------------------------------------------- 15°C

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 ---------------------------------------------------------------------------------------------- 4.5V to 23V

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

−40°C to 125°C

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

−40°C to 85°C

Electrical Characteristics

(VIN = 12V, TA = 25

°C unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

VEN = 0V

0.5

µA

Supply Current

ICC

VEN = 3 V, VFB = 1V

0.8

1.2

Feedback Voltage

VFB

4.5V ≦ VIN ≦ 23V

0.909

0.923

0.937

Error Amplifier Transconductance

GEA

ΔIC = ± 10µA

940

µA/V

High-Side Switch-On Resistance

RDS(ON)1

130

Ω

Low-Side Switch-On Resistance

RDS(ON)2

130

Ω

High-Side Switch Leakage Current

VEN = 0V, VSW = 0V

µA

Upper Switch Current Limit

Min.Duty Cycle, VBOOT−SW = 4.8V

4.3

Low Switch Current Limit

From Drain to Source

1.3

COMP to Current Sense

Transconductance

GCS

A/V

Oscillator Frequency

fOSC1

300

340

380

kHz

Short Circuit Oscillation

Frequency

fOSC2

VFB = 0V

100

kHz

Maximum Duty Cycle

DMAX

VFB = 0.7V

Minimum On-Time

tON

100

To be continued

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