TC1240

2

TC1240-1 7/7/00 DS21333A

Positive Doubling Charge Pump with

Shutdown in SOT Package

© 2001 Microchip Technology Inc.

ABSOLUTE MAXIMUM RATINGS*

Current at OUT Pin ................................................. 50 mA

Short-Circuit Duration –OUT to GND ................ Indefinite

Operating Temperature Range ...............–40

°C to +85°C

≤ 70°C)

6-Pin SOT-23A ..........................................240 mW

Storage Temperature (Unbiased) ......... –65

°C to +150°C

Lead Temperature (Soldering, 10 sec) ................. +300

°C

*Static-sensitive device. Unused devices must be stored in conductive

material. Protect devices from static discharge and static fields. Stresses

above those listed under Absolute Maximum Ratings may cause perma-

nent 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 operational sections of the specifications is not implied.

Exposure to Absolute Maximum Rating Conditions for extended periods

may affect device reliability.

°C.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Units

IDD

Supply Current

∞

—

180

300

µA

Shutdown Supply Current

—

0.1

1.0

µA

Minimum Supply Voltage

Ω

2.5

—

—

V

Maximum Supply Voltage

Ω

—

—

4.0

V

Oscillator Frequency

°C to +85°C

—

160

—

kHz

Switching Frequency

°C to +85°C

40

80

125

kHz

Shutdown Input Logic High

1.4

—

—

V

Shutdown Input Logic Low

—

—

0.4

V

Power Efficiency

Ω

86

93

—

%

Voltage Conversion

∞

97.5

99.96

—

%

Efficiency

Output Resistance

Ω

—17

—

Ω

(Note 1)

°C to +85°C—

—

30

NOTE: 1. Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / pump frequency x capacitance)].

2. Switching frequency is one-half internal oscillator frequency.

PIN DESCRIPTION

Pin No.

(6-Pin SOT-23A)

Symbol

Description

1

Power Supply Input.

2

GND

Ground.

3

C –

Commutation Capacitor Negative Terminal.

4

SHDN

Shutdown Input (Active High).

5

OUT

Doubled Output Voltage.

6

C+

Commutation Capacitor Positive Terminal.