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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1240A Datasheet

Positive Doubling Charge Pumps

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TC1240A pdf
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 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+ VIN
TC1240
TC1240A
INPUT
C-
SHDN
OFF
ON
GND
VOUT
+ 2 x INPUT
C2
2001-2012 Microchip Technology Inc.
DS21516D-page 1
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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1240A Datasheet

Positive Doubling Charge Pumps

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TC1240A pdf
TC1240/TC1240A
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage (VIN to GND)
TC1240 ............................................. +4.5V, -0.3V
TC1240A ........................................... +5.8V, -0.3V
Output Voltage (VOUT to GND)
TC1240 ....................................... +9.0V, VIN -0.3V
TC1240A ................................... +11.6V, VIN -0.3V
Current at VOUT Pin............................................50 mA
Short-Circuit Duration: VOUT to GND .............Indefinite
Thermal Resistance .......................................210°C/W
Power Dissipation (TA = +25°C)........................600 mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature (Unbiased) .......-65°C to +150°C
† Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. These
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.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1240 ELECTRICAL SPECIFICATIONS
Electrical Specifications: Unless otherwise noted, typical values apply at TA = +25°C. Minimum and maximum val-
ues apply for TA = -40° to +85°C, and VIN = +2.8V, C1 = C2 = 3.3 µF, SHDN = GND.
Parameters
Sym Min Typ Max Units
Conditions
Supply Current
IDD — 180 300 µA RLOAD =
Shutdown Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
ISHDN
0.1 1.0 µA SHDN = VIN
VMIN
2.5
V RLOAD = 1.0 k
VMAX
— 4.0
V RLOAD = 1.0 k
Oscillator Frequency
FOSC — 160 — kHz TA = -40°C to +85°C
Switching Frequency (Note 1) FSW 40 80 125 kHz TA = -40°C to +85°C
Shutdown Input Logic High
VIH 1.4 — — V VIN = VMIN to VMAX
Shutdown Input Logic Low
VIL — — 0.4 V VIN = VMIN to VMAX
Power Efficiency
PEFF
86
93
% RLOAD = 1.0 k
Voltage Conversion Efficiency
Output Resistance (Note 2)
VEFF
ROUT
97.5 99.96
— 17
——
30
% RLOAD =
RLOAD = 1.0 k
TA = -40°C to +85°C
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.


Part Number TC1240A
Description Positive Doubling Charge Pumps
Maker Microchip
Total Page 18 Pages
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