RT8293B datasheet(4/14 Pages) RICHTEK

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RT8293B

DS8293B-03

March 2011

www.richtek.com

Electrical Characteristics

(VIN = 12V, TA = 25

°C, unless otherwise specified)

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

All Other Pin Voltages --------------------------------------------------------------------------------------------

−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

(Εxposed 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

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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

VEN = 0V

0.5

µA

Supply Current

VEN = 3V, VFB = 0.9V

0.8

1.2

Feedback Voltage

VFB

4.5V

≤ VIN ≤ 23V

0.788

0.8

0.812

Error Amplifier

Transconductance

GEA

∆IC = ±10µA

940

µA/V

High Side Switch

On-Resistance

RDS(ON)1

Ω

Low Side Switch

On-Resistance

RDS(ON)2

Ω

High Side Switch Leakage

Current

VEN = 0V, VSW = 0V

µA

High Side Switch Current Limit

Min. Duty Cycle, BOOT

−V

SW = 4.8V

5.1

Low Side Switch Current Limit

From Drain to Source

1.5

COMP to Current Sense

Transconductance

GCS

5.4

A/V

Oscillation Frequency

FOSC1

1.2

1.4

MHz

Short Circuit Oscillation

Frequency

FOSC2

VFB = 0V

270

kHz

Maximum Duty Cycle

DMAX

VFB = 0.7V

Minimum On-Time

tON

100

To be continued

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