General Description
The TC1240/TC1240A is a doubling CMOS charge pump voltage converter in a small 6-Pin SOT-23A package. The TC1240 doubles an input voltage that can range from +2.5V to +4.0V, while the TC1240A doubles an input voltage that can range from +2.5V to +5.5V. Conversion efficiency is typically >99%. Internal oscillator frequency is 160 kHz for both devices. The TC1240 and TC1240A have an active-high shutdown that limits the current consumption of the devices to less than 1 µA.

Features
• Charge Pumps in 6-Pin SOT-23A Package
• >99% Typical Voltage Conversion Efficiency
• Voltage Doubling
• Input Voltage Range,
   TC1240: +2.5V to +4.0V,
   TC1240A: +2.5V to +5.5V
• Low Output Resistance,
   TC1240: 17Ω (Typical)
   TC1240A: 12Ω (Typical)
• Only Two External Capacitors Required
• Low Supply Current,
   TC1240: 180 µA (Typical)
   TC1240A: 550 µA (Typical)
• Power-Saving Shutdown Mode (1 µA Maximum)
• Shutdown Input Fully Compatible with 1.8V Logic
   Systems

Applications
• Cellular Phones
• Pagers
• PDAs, Portable Data Loggers
• Battery Powered Devices
• Handheld Instruments