TC1240 Datasheet, PDF (1/11 Pages) Microchip Technology – Positive Doubling Charge Pump with Shutdown in SOT Package

Positive Doubling Charge Pump with
Shutdown in SOT Package
T^TC^C1¹2⁴4⁰0
Positive Doubling Charge Pump with Shutdown
in SOT Package
FEATURES
I Space Saving 6-Pin SOT-23A Package
I >99% Typical Voltage Conversion Efficiency
I Voltage Doubling
I Operates from +2.5V to +4.0V
I Low Output Resistance (17Ω Typical)
I Only Two External Capacitors Required
I Consumes 180µA (Typical) in Active Mode
I Power-Saving Shutdown Mode (1µA Maximum)
I Fully Compliant with 1.8V Logic Sytems
APPLICATIONS
I Cellular Phones
I Pagers
I PDAs, Portable Data Loggers
I Battery-Powered Devices
I Handheld Instruments
GENERAL DESCRIPTION
The TC1240 is a doubling CMOS charge-pump voltage
converter in a small 6-Pin SOT-23A package. TC1240
doubles an input voltage which can range from +2.5V to
+4.0V. Conversion efficiency is typically >99%. Internal
oscillator frequency is 160kHz for the TC1240. The TC1240
has an active high shutdown which limits the current con-
sumption of the device to less than 1µA.
External component requirement is only two capacitors
for standard voltage doubler applications. All other circuitry,
including control, oscillator, power MOSFETs are integrated
on-chip. Typical supply current is 180µA and the device is
available in a 6-Pin SOT-23A surface mount package.
ORDERING INFORMATION
Part
Number
Package
TC1240ECH
6-Pin SOT-23A
Temp. Range
–40°C to +85°C
TYPICAL OPERATING CIRCUIT
Positive Voltage Doubler
C⁺
V_IN
C₁
INPUT
C^–
SHDN
TC1240
OFF
ON
GND
OUT
2 x INPUT
C2
PIN CONFIGURATION
6-Pin SOT-23A
V_{IN 1}
6 C+
GND 2 ^TC1240ECH 5 ^OUT
C^– 3
4 SHDN
NOTE: *6-Pin SOT-23A is equivalent to EIAJ SC-74
TC1240-1 7/7/00 DS21333A
1
© 2001 Microchip Technology Inc.