Positive Doubling Charge Pumps
TC1240/TC1240A
Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
Features
• Charge Pumps in 6-Pin SOT-2...
Description
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...
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