RT9971 datasheet(11/22 Pages) RICHTEK

11 / 22 page

DS9971-01 April 2011

www.richtek.com

RT9971

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 point of

θJC is on the exposed pad for the WQFN

package.

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 Condition

Min

Typ

Max

Unit

RTC LDO, CN = High

Input Voltage Range

VIN

5.5

Standby Current

VIN = 4.2V

µA

Output Voltage

VOUT

IOUT = 0mA

3.25

3.3

Maximum Output Current

VIN = 4.2V

Dropout Voltage

VDROP

IOUT = 20mA

200

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