RT7274 datasheet(10/22 Pages) RICHTEK

10 / 22 page

RT7274/79/80/81

DS7274/79/80/81-01 February 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Note 1.

Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and 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 may

affect device reliability.

Note 2.

θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is

measured at the exposed pad of the package. The PCB copper area of exposed pad is 70mm2.

Note 3.

Devices are ESD sensitive. Handling precaution is recommended.

Note 4.

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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

VPVCC Output

VPVCC Output Voltage

VPVCC

≤ VIN ≤ 18V, 0 < IPVCC < 5mA

4.7

5.1

5.5

Line Regulation

≤ VIN ≤ 18V, IPVCC = 5mA

Load Regulation

< IPVCC < 5mA

100

Output Current

IPVCC

VIN = 6V, VPVCC = 4V

110

RDS(ON)

High Side

RDS(ON) _H

150

Switch On

Resistance

Low Side

RDS(ON) _L

105

Current Limit

ILIM

LSW = 2μH

2.5

3.5

4.7

Thermal Shutdown

Thermal Shutdown Threshold TSD

150

°C

Thermal Shutdown

Hysteresis

ΔTSD

°C

On-Time Timer Control

On-Time

tON

VIN = 12V, VOUT = 1.05V

145

Minimum Off-Time

tOFF(MIN)

230

Soft-Start

SS Charge Current

VSS = 0V

1.4

2.6

μA

SS Discharge Current

VSS = 0.5V

0.05

0.1

UVLO

Wake up VPVCC

3.55

3.85

4.15

UVLO Threshold

Hysteresis

0.3

Power Good (RT7279/80)

FB Rising

PGOOD Threshold

FB Falling

PGOOD Sink Current

PGOOD = 0.5V

Output Under Voltage and Over Voltage Protection (RT7279/80)

OVP Trip Threshold

OVP Detect

115

120

125

OVP Delay Time

μs

UVP Detect

UVP Trip Threshold

Hysteresis

UVP Delay Time

250

μs

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