TC1240

TC1240/TC1240A Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package 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: 17 (Typical) TC1240A: 12 (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 Package Type 6-Pin SOT-23A C+ VOUT SHDN 6 54 TC1240ECH TC1240AECH 123 VIN GND C- NOTE: 6-Pin SOT-23A is equivalent to the EIAJ (SC-74A) 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. External component requirement is only two capacitors for standard voltage doubler applications. All other circuitry (including control, oscillator and power MOSFETs) are integrated on-chip. Typical...