TC1240ECH View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC1240ECH

Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package

Microchip Technology 

TC1240/TC1240A

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

Input Voltage (VIN to GND)

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

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

Output Voltage (VOUT to GND)

TC1240 ....................................... +9.0V, VIN -0.3V

TC1240A ................................... +11.6V, VIN -0.3V

Current at VOUT Pin............................................50 mA

Short-Circuit Duration: VOUT to GND .............Indefinite

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

Power Dissipation (TA = +25°C)........................600 mW

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

Electrical Specifications: Unless otherwise noted, typical values apply at TA = +25°C. Minimum and maximum val-

ues apply for TA = -40° to +85°C, and VIN = +2.8V, C1 = C2 = 3.3 µF, SHDN = GND.

Parameters

Sym Min Typ Max Units

Conditions

Supply Current

IDD

—

180

300

µA RLOAD = ∞

Shutdown Supply Current

Minimum Supply Voltage

Maximum Supply Voltage

ISHDN

—

0.1

1.0

µA SHDN = VIN

VMIN

2.5

—

—

V RLOAD = 1.0 kΩ

VMAX

—

—

4.0

V RLOAD = 1.0 kΩ

Oscillator Frequency

FOSC

—

160

—

kHz TA = -40°C to +85°C

Switching Frequency (Note 1) FSW

40

80

125 kHz TA = -40°C to +85°C

Shutdown Input Logic High

VIH

1.4

—

—

V VIN = VMIN to VMAX

Shutdown Input Logic Low

VIL

—

—

0.4

V VIN = VMIN to VMAX

Power Efficiency

PEFF

86

93

—

Voltage Conversion Efficiency VEFF 97.5 99.96 —

% RLOAD = 1.0 kΩ

% RLOAD = ∞

Output Resistance (Note 2)

ROUT

—

17

—

Ω RLOAD = 1.0 kΩ

—

—

30

TA = -40°C to +85°C

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].

DS21516C-page 2

 2003 Microchip Technology Inc.

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