 2002 Microchip Technology Inc.

DS21366B-page 1

Features

• Charge Pumps in 6-Pin SOT-23A Package

• >95% Voltage Conversion Efficiency

• Voltage Inversion and/or Doubling

• Operates from +2.5V to +5.5V

• Up to 25mA Output Current

• Only Two External Capacitors Required

• Low Power Consumption

• Power-Saving Shutdown Mode

• TC1220 Compatible with 1.8V Logic Systems

Applications

• LCD Panel Bias

• Cellular Phones

• Pagers

• PDAs, Portable Dataloggers

• Battery-Powered Devices

Device Selection Table

Package Type

General Description

The

TC1219/TC1220

are

CMOS

“charge-pump”

voltage converters in ultra-small 6-Pin SOT-23A

packages. They invert and/or double an input voltage

which can range from +2.5V to +5.5V. Conversion

efficiency is typically >95%. Switching frequency is

12kHz for the TC1219, 35kHz for the TC1220. When

the shutdown pin is held at a logic low, the device goes

into a very low power mode of operation, consuming

less than 1

µA of supply current.

External component requirement is only two capacitors

for standard voltage inverter applications. With a few

additional components a positive doubler can also be

built. All other circuitry, including control, oscillator,

power MOSFETs are integrated on-chip. Typical supply

currents are 60

µA (TC1219), 115µA (TC1220).

All devices are available in 6-pin SOT-23A surface

mount packages.

Functional Block Diagram

Part

Number

Package

Osc.

Freq.

(kHz)

Operating

Temp.

Range

TC1219ECH 6-Pin SOT-23A

12

-40°C to +85°C

TC1220ECH 6-Pin SOT-23A

35

-40°C to +85°C

C+

C–

TC1219ECH

TC1220ECH

12

3

54

SHDN

GND

6-Pin SOT-23A

NOTE: 6-Pin SOT-23A is equivalent to the EIAJ SC-74

OUT

6

TC1219

TC1220

V–

Output

C+

C–

C1

C2

Input

GND

OUT

SHDN

ON

OFF

+

+

Negative Voltage Inverter

Switched Capacitor Voltage Converters with Shutdown in SOT Packages