RT8290 datasheet(4/12 Pages) RICHTEK

4 / 12 page

RT8290

DS8290-02

March 2011

www.richtek.com

Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may remain possibility to affect device reliability.

Note 2.

θJA is measured in the natural convection at TA = 25°C on a high effective thermal conductivity four-layer test board of

JEDEC 51-7 thermal measurement standard. The measurement case position of

θJC is on the exposed pad of the

package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Electrical Characteristics

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Shutdown Supply Current

VEN = 0V

0.3

μA

Supply Current

VEN = 3V, VFB = 1V

0.8

1.2

Feedback Voltage

VFB

4.5V

≤ VIN ≤ 23V

0.911

0.925

0.939

Error Amplifier Transconductance

GEA

ΔIC = ±10μA

940

μA/V

High Side Switch On-Resistance

RDS(ON)1

100

Low Side Switch On-Resistance

RDS(ON)2

High Side Switch Leakage Current

VEN = 0V, VSW = 0V

μA

Upper Switch Current Limit

Min. Duty Cycle

VBOOT − VSW = 4.8V

5.1

Lower Switch Current Limit

From Drain to Source

1.5

COMP to Current Sense

Transconductance

GCS

5.4

A/V

Oscillation Frequency

fOSC1

300

340

380

kHz

Short Circuit Oscillation Frequency

fOSC2

VFB = 0V

100

kHz

Maximum Duty Cycle

DMAX

VFB = 0.8V

Minimum On Time

tON

100

Logic-High

VIH

2.7

EN Input Threshold

Voltage

Logic-Low

VIL

0.4

Input Under Voltage Lockout

Threshold

VUVLO

VIN Rising

3.8

4.2

4.5

Input Under Voltage Lockout

Threshold Hysteresis

ΔVUVLO

320

Soft-Start Current

ISS

VSS = 0V

μA

Soft-Start Period

tSS

CSS = 0.1μF

15.5

Thermal Shutdown

TSD

150

°C

(VIN = 12V, TA = 25

°C unless otherwise specified)

RT8290 Datasheet(PDF) 4 Page - Richtek Technology Corporation

RT8290 Datasheet(HTML) 4 Page - Richtek Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Datasheet Download

Link URL