2

Switched Capacitor

Voltage Converters

TC828A

TC828A-1 5/1/00

ABSOLUTE MAXIMUM RATINGS*

Output Voltage (OUT to GND) .................... –6.0V, + 0.3V

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

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

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

°C to +85°C

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

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

°C to +150°C

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

°C

*This is a stress rating 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.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Supply Current

—

38

80

µA

V

+

Minimum Supply

1.8

—

—

V

Voltage

V

+

Maximum Supply

—

—

5.5

V

Voltage

Oscillator Frequency

6

12

20

KHz

Power Efficiency

96

—

%

Voltage Conversion

95

99.9

—

%

Efficiency

Output Resistance

—

25

50

Ω

—

65

PIN DESCRIPTION

Pin No.

(5-Pin SOT-23A)

Symbol

Description

1

OUT

Inverting charge pump output.

Positive power supply input.

3C

–

1

Commutation capacitor negative terminal.

4

GND

Ground.

+

Commutation capacitor positive terminal.

NOTE: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)].

2. All – 40

°C to +85°C specifications above are guaranteed by design.