TC1222

Features:

• Charge Pumps in 6-Pin SOT-23A Package
• 96% Voltage Conversion Efficiency
• Voltage Inversion and/or Doubling
• Operates from +1.8V to +5.5V
• Up to 25mA Output Current
• Only Two External Capacitors Required
• Power-Saving Shutdown Mode
• Fully Compatible with 1.8V Logic Systems




Application

• LCD Panel Bias
• Cellular Phones
• Pagers
• PDAs, Portable Data Loggers
• Battery-Powered Devices




Pinout






Specifications

Parameter NameValueTypical Active Output Current (mA)25Output Voltage (V)Vout = -Vin or Vout = 2VinTypical Quiescent Current (A)1800Input Voltage Range (V)1.8 to 5.5Operating Temp. Range (°C)-45 to 85Device DescriptionInverting or Doubling

Parameter Name	Value
Typical Active Output Current (mA)	25
Output Voltage (V)	Vout = -Vin or Vout = 2Vin
Typical Quiescent Current (A)	1800
Input Voltage Range (V)	1.8 to 5.5
Operating Temp. Range (°C)	-45 to 85
Device Description	Inverting or Doubling

Input Voltage (V_IN to GND)......................... +6.0V, -0.3V
Output Voltage (OUT to GND).................... -6.0V, +0.3V
Current at OUT Pin................................................50mA
Short-Circuit Duration OUT to GND.............Indefinite
Power Dissipation (T_A 70)
6-Pin SOT-23A .................................................240mW
Operating Temperature Range..............-40 to +85
Storage Temperature (Unbiased) .......-65 to +150

*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.

Description

The TC1221/1222 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 +1.8V to +5.5V. Conversion efficiency is typically 96%. Switching frequency is 125 kHz for the TC1221, 750KHz for the TC1222. When the shutdown pin is held at a logic low, the device goes into a very low power mode of operation, consuming less than 1mA of supply current. For standard voltage inverter applications, the device requires only two external capacitors. 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 290A (TC1221) and 1800A (TC1222). All devices are available in 6-Pin SOT-23A surface mount packages.