TC1240/TC1240A Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package Features General Description Charge Pumps in 6-Pin SOT-23A Package The TC1240/TC1240A is a doubling CMOS charge pump voltage converter in a small 6-Pin SOT-23A >99% Typical Voltage Conversion Efficiency package. The TC1240 doubles an input voltage that Voltage Doubling can range from +2.5V to +4.0V, while the TC1240A Input Voltage Range, TC1240: +2.5V to +4.0V, doubles an input voltage that can range from +2.5V to TC1240A: +2.5V to +5.5V +5.5V. Conversion efficiency is typically >99%. Internal Low Output Resistance, TC1240: 17 (Typical) oscillator frequency is 160 kHz for both devices. The TC1240A: 12 (Typical) TC1240 and TC1240A have an active-high shutdown Only Two External Capacitors Required that limits the current consumption of the devices to less than 1 A. Low Supply Current, TC1240: 180 A (Typical) TC1240A: 550 A (Typical) External component requirement is only two capacitors Power-Saving Shutdown Mode (1 A Maximum) for standard voltage doubler applications. All other circuitry (including control, oscillator and power Shutdown Input Fully Compatible with 1.8V Logic MOSFETs) are integrated on-chip. Typical supply cur- Systems rent is 180A for the TC1240 and 550A for the TC1240A. Both devices are available in a 6-Pin SOT- Applications 23A surface mount package. Cellular Phones Pagers Typical Application Circuit PDAs, Portable Data Loggers Battery Powered Devices Positive Voltage Doubler Handheld Instruments V INPUT C+ IN + TC1240 Package Type C 1 TC1240A 6-Pin SOT-23A C- OFF SHDN ON V C+ SHDN OUT 6 5 4 V OUT 2 x INPUT GND + C 2 TC1240ECH TC1240AECH 132 V GND C- IN NOTE: 6-Pin SOT-23A is equivalent to the EIAJ (SC-74A) 2001-2012 Microchip Technology Inc. DS21516D-page 1TC1240/TC1240A Stresses above those listed under Absolute Maximum 1.0 ELECTRICAL Ratings may cause permanent damage to the device. These CHARACTERISTICS 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. Absolute Maximum Ratings Exposure to Absolute Maximum Rating conditions for Input Voltage (V to GND) extended periods may affect device reliability. IN TC1240 ............................................. +4.5V, -0.3V TC1240A........................................... +5.8V, -0.3V Output Voltage (V to GND) OUT TC1240 ....................................... +9.0V, V -0.3V IN TC1240A................................... +11.6V, V -0.3V IN Current at V Pin............................................50 mA OUT Short-Circuit Duration: V to GND .............Indefinite OUT Thermal Resistance .......................................210C/W Power Dissipation (T = +25C)........................600 mW A Operating Temperature Range.............-40C to +85C Storage Temperature (Unbiased) .......-65C to +150C TC1240 ELECTRICAL SPECIFICATIONS Electrical Specifications: Unless otherwise noted, typical values apply at T = +25C. Minimum and maximum val- A ues apply for T = -40 to +85C, and V = +2.8V, C = C = 3.3 F, SHDN = GND. A IN 1 2 Parameters Sym Min Typ Max Units Conditions Supply Current I 180 300 A R = DD LOAD Shutdown Supply Current I 0.1 1.0 A SHDN = V SHDN IN Minimum Supply Voltage V 2.5 V R = 1.0 k MIN LOAD Maximum Supply Voltage V 4.0 V R = 1.0 k MAX LOAD Oscillator Frequency F 160 kHzT = -40C to +85C OSC A Switching Frequency (Note 1) F 40 80 125 kHz T = -40C to +85C SW A Shutdown Input Logic High V 1.4 V V = V to V IH IN MIN MAX Shutdown Input Logic Low V 0.4 V V = V to V IL IN MIN MAX Power Efficiency P 86 93 % R = 1.0 k EFF LOAD Voltage Conversion Efficiency V 97.5 99.96 % R = EFF LOAD Output Resistance (Note 2) R 17 R = 1.0 k OUT LOAD 30 T = -40C to +85C A Note 1: Switching frequency is one-half internal oscillator frequency. 2: Capacitor contribution is approximately 26% of the output impedance ESR = 1 / switching frequency x capacitance . DS21516D-page 2 2001-2012 Microchip Technology Inc.