TC1240/TC1240A

DS21516D-page 2

 2001-2012 Microchip Technology Inc.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

TC1240 ............................................. +4.5V, -0.3V

TC1240A ........................................... +5.8V, -0.3V

Thermal Resistance .......................................210°C/W

Operating Temperature Range............. -40°C to +85°C

Storage Temperature (Unbiased) .......-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.

TC1240 ELECTRICAL SPECIFICATIONS

Parameters

Sym

Min

Typ

Max

Units

Conditions

Supply Current

—

180

300

µA

Shutdown Supply Current

—

0.1

1.0

µA

Minimum Supply Voltage

2.5

—

—

V

Maximum Supply Voltage

——

4.0

V

Oscillator Frequency

—160

—

kHz

Switching Frequency (Note 1)

40

80

125

kHz

Shutdown Input Logic High

1.4

—

—

V

Shutdown Input Logic Low

——

0.4

V

Power Efficiency

86

93

—

%

Voltage Conversion Efficiency

97.5

99.96

—

%

Output Resistance (Note 2)

—

—

17

—

—

30



Note 1:

Switching frequency is one-half internal oscillator frequency.

2:

Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / switching frequency x

capacitance].