TC1240_13 Datasheet, PDF (1/18 Pages) Microchip Technology – Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package

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+ V_OUT SHDN
6
5
4
TC1240ECH
TC1240AECH
1
2
3
V_IN 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 supply cur-
rent is 180 µA for the TC1240 and 550 µA for the
TC1240A. Both devices are available in a 6-Pin SOT-
23A surface mount package.
Typical Application Circuit
Positive Voltage Doubler
+
C₁
C+
V_IN
TC1240
TC1240A
INPUT
C-
SHDN
OFF
ON
GND
V_OUT
+
2 x INPUT
C₂
 2001-2012 Microchip Technology Inc.
DS21516D-page 1