RT7277 datasheet(5/14 Pages) RICHTEK

5 / 14 page

RT7277

DS7277-00

October 2012

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 70mm

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

RDS(ON)

High Side

RDS(ON)_H

Switch On

Resistance

Low Side

RDS(ON)_L

Current Limit

ILIM

3.5

4.1

5.7

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 On-Time

tON(MIN)

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

UVLO Threshold

VIN Rising to Wake up VPVCC

3.55

3.85

4.15

Hysteresis

0.3

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