TC1268 datasheet(3/12 Pages) MICROCHIP

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DS21379B-page 3

TC1268

TC1268 ELECTRICAL SPECIFICATIONS

(CONTINUED)

Electrical Characteristics: VIN =VOUT +1V, IL =100µA, CL =3.3µF, SHDN >VIH,TA = 25°C, unless otherwise noted. Boldface

type specifications apply for junction temperatures of -40°C to +125°C.

ERROR Output

VMIN

Minimum Operating Voltage

1.0

—

VOL

Output Logic Low Voltage

—

400

1 mA Flows to ERROR

VTH

ERROR Threshold Voltage

—

0.95 x VR

—V

Note 1:

VR is the regulator output voltage setting.

Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested over a load range from

0.1mA to the maximum specified output current. Changes in output voltage due to heating effects are covered by the thermal regulation

specification.

Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at a 1V

differential.

Thermal Regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or

line regulation effects. Specifications are for a current pulse equal to ILMAX at VIN = 6V for T = 10 msec.

The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the

thermal resistance from junction-to-air (i.e., TA,TJ, θJA). Exceeding the maximum allowable power dissipation causes the device to initiate

thermal shutdown. Please see Section 4.0 Thermal Considerations for more details.

Hysteresis voltage is referenced to VR.

The minimum VIN has to justify the conditions: VIN ≥ VR +VDROPOUT and VIN ≥ 2.7V for IL = 0.1mA to IOUTMAX.

TC VOUT =(VOUTMAX –VOUTMIN)x 10

VOUT x ∆T

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