TC1268

DS21379B-page 2

© 2002 Microchip Technology Inc.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Input Voltage .........................................................6.5V

Power Dissipation................Internally Limited (Note 6)

Storage Temperature.......................... -65°C to +150°C

*Stresses above 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 above those indicated in the

operation sections of the specifications is not implied.

Exposure to Absolute Maximum Rating conditions for

extended periods may affect device reliability.

TC1268 ELECTRICAL SPECIFICATIONS

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

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Input Operating Voltage

2.7

—

6.0

V

Note 8

Maximum Output Current

500

——

mA

Output Voltage

—

—

—

V

Note 1

∆V

—

40

—

ppm/°C

Note 2

∆V

Line Regulation

—

0.05

0.35

Load Regulation

—

0.002

0.01

%/mA

Dropout Voltage

—

—

—

—

20

60

200

350

30

160

480

800

mV

Supply Current (Active Mode)

—

80

130

Supply Current (Shutdown Mode)

—

5

—

µASHDN =0V

Wake-up Time

(from Shutdown Mode)

—5

10

µsec

Settling Time

(from Shutdown Mode)

—15

—

µsec

PSRR

Power Supply Rejection Ratio

—

64

—

dB

Output Short Circuit Current

—

1200

1400

mA

Thermal Regulation

—

0.04

—

V/W

Note 5

eN

Output Noise

—

260

—

nV/

MAX

SHDN Input

SHDN Input High Threshold

45

——

SHDN Input Low Threshold

—

—

15

Note 1:

2:

3:

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.

4:

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.

5:

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

6:

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

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

7:

8:

6