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PDF TC1240 Data sheet ( Hoja de datos )

Número de pieza TC1240
Descripción Positive Doubling Charge Pump with Shutdown in SOT Package
Fabricantes Microchip Technology　
Logotipo Microchip Technology Logotipo



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No Preview Available ! TC1240 Hoja de datos, Descripción, Manual

Positive Doubling Charge Pump with
Shutdown in SOT Package
TTCC1124400
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+ VIN
C1
INPUT
C–
SHDN
TC1240
OFF
ON
GND
OUT
2 x INPUT
C2
PIN CONFIGURATION
6-Pin SOT-23A
VIN 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.

1 page




TC1240 pdf
Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240
ROUT =
R
OUT
OF
SINGLE
DEVICE
NUMBER OF DEVICES
VIN . . .
VIN
C1A
3
TC1240
2
1
C1B
3
TC1240
2
1
6 "1"
4
SHDN
5
6 "n"
4 SHDN
5
VOUT
...
Shutdown
Control
VOUT = 2 x VIN
C2
Figure 5. Paralleling Multiple Devices to Reduce Output Resistance
PARALLELING DEVICES
To reduce the value of ROUT, multiple TC1240s can be
connected in parallel (Figure 5). The output resistance will
be reduced by a factor of N where N is the number of
TC1240s. Each device will require its own pump capacitor
(C1x), but all devices may share one resevoir capacitor (C2).
However, to preserve ripple performance the value of C2
should be scaled according to the number of paralleled
TC1240s.
LAYOUT CONSIDERATIONS
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
TC1240 DEMO CARD
The TC1240 Demo Card is a 1.25” x 1.0” card contain-
ing a TC1240 and all of the necessary external components
that allow the user to evaluate the device’s ability to gener-
ate a 2X non-regulated output voltage. The demo card is
fully assembled with the required external capacitors along
with a variable load resistor that allows the user to vary the
output load current of the output stage. For convenience,
several test points and jumpers are available for measuring
various voltages and currents on the circuit board.
TC1240-1 7/7/00 DS21333A
Figure 6. TC1240 Demo Card Schematic
5
© 2001 Microchip Technology Inc.

5 Page





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Microchip Technology Inc.
DS21333A - page 11

11 Page







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