LR8421 datasheet(4/7 Pages) LRC

4 / 7 page

ABSOLUTE MAXIMUM RATINGS

(1)

PARAMETER

SYMBOL

RATINGS

UNITS

CE Voltage

(2)

VCE

VOUT+0.3

Other Pins Voltage

(2)

Power Dissipation

(3)

SOP8-PP

PD@TA=25°C

Package Thermal Resistance

(4)

125

°C/W

Operating Junction Temperature Range

150

°C

Lead Temperature(Soldering, 10 sec)

Tsolder

260

°C

Storage Temperature Range

Tstg

-65~150

°C

(1) Stresses beyond those listed under 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 under

recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods

my affect device reliability.

(2) All voltages are with respect to network ground terminal.

(3) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-to

ambient thermal resistance JA, and the ambient temperature TA. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by PD (MAX) = [ TJ(MAX)-TA ]/ JA. Exceeding the maximum allowable power

dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal

shutdown circuitry protects the device from permanent damage.

(4) JA is measured in the natural convection at TA=25

on a two-layer Chipower Evaluation Board

RECOMMENDED OPERATING CONDITIONS

(5)

MIN

NOM

MAX

UNITS

Supply voltage at VBAT

1.8

5.25

Output voltage at VOUT

2.5

5.5

VOUT+0.3

All other pins

5.5

Operating Ambient temperature range, TA

-40

°C

Operating junction temperature range, Tj

-40

125

°C

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

LESHAN RADIO COMPANY, LTD.

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