RT8274 datasheet(4/12 Pages) RICHTEK

4 / 12 page

RT8274

DS8274-01 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 four layers thermal conductivity test board of

JEDEC 51-7 thermal measurement standard. The 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

Feedback Reference Voltage

VFB

4.75V

≤ VIN ≤ 24V

1.184

1.222

1.258

High Side Switch-On Resistance

RDS(ON)1

0.1

0.16

Low Side Switch-On Resistance

RDS(ON)2

Switch Leakage

VEN = 0V, VSW = 0V

μA

Current Limit

ILIM

Duty = 90%; VBOOT−SW = 4.8V

3.6

4.4

5.2

Current Sense Transconductance

GCS

Output Current to VCOMP

A/V

Error Amplifier Tansconductance

ΔIC = ±10μA

930

μA/V

Oscillator Frequency

fSW

340

400

460

kHz

Short Circuit Oscillation Frequency

VFB = 0V

120

kHz

Maximum Duty Cycle

DMAX

VFB = 0.8V

Minimum On-Time

tON

100

Under Voltage Lockout Threshold

Rising

3.8

4.2

4.5

Under Voltage Lockout Threshold

Hysteresis

300

Logic-High

VIH

1.4

EN Threshold

Voltage

Logic-Low

VIL

0.4

Enable Pull Up Current

0.5

μA

Shutdown Current

ISHDN

VEN = 0V

μA

Quiescent Current

VEN = 2V, VFB = 1.5V

0.8

Soft-Start Current

ISS

μA

Soft-Start Period

CSS = 0.1μF

Thermal Shutdown

TSD

150

°C

(VIN = 12V, TA = 25

°C unless otherwise specified)

To be continued

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