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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1240 Datasheet

Positive Doubling Charge Pump with Shutdown in SOT Package

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TC1240 pdf
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 (17Typical)
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
C3
4 SHDN
NOTE: *6-Pin SOT-23A is equivalent to EIAJ SC-74
TC1240-1 7/7/00 DS21333A
1 © 2001 Microchip Technology Inc.


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1240 Datasheet

Positive Doubling Charge Pump with Shutdown in SOT Package

No Preview Available !

TC1240 pdf
Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VIN to GND) .......................... +4.5V, –0.3V
Output Voltage (OUT to GND) .............. +9.0V, VIN – 0.3V
Current at OUT Pin ................................................. 50 mA
Short-Circuit Duration –OUT to GND ................ Indefinite
Operating Temperature Range ...............–40 °C to +85°C
Power Dissipation (TA 70°C)
6-Pin SOT-23A ..........................................240 mW
Storage Temperature (Unbiased) ......... –65 °C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent 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 operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.
ELECTRICAL CHARACTERISTICS: TA = –40 to +85 °C, VIN = +2.8V, C1 = C2 = 3.3µF , SHDN = GND,
unless otherwise noted. Typical values are at TA = +25°C.
Symbol
Parameter
Test Conditions
Min Typ
IDD Supply Current
RLOAD =
— 180
ISHDN
Shutdown Supply Current
SHDN = VIN
— 0.1
VMIN
VMAX
FOSC
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
RLOAD = 1.0K
RLOAD = 1.0K
TA = –40 °C to +85°C
2.5 —
——
— 160
FSW Switching Frequency
TA = –40 °C to +85°C
40 80
VIH
Shutdown Input Logic High
VIN = VMIN to VMAX
1.4 —
VIL
PEFF
VEFF
Shutdown Input Logic Low
Power Efficiency
Voltage Conversion
Efficiency
VIN = VMIN to VMAX
RLOAD = 1.0K
RLOAD =
——
86 93
97.5 99.96
ROUT
Output Resistance
(Note 1)
RLOAD = 1.0K
TA = –40°C to +85°C
— 17
——
NOTE: 1. Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / pump frequency x capacitance)].
2. Switching frequency is one-half internal oscillator frequency.
Max
300
1.0
4.0
125
0.4
30
Units
µA
µA
V
V
kHz
kHz
V
V
%
%
PIN DESCRIPTION
Pin No.
(6-Pin SOT-23A)
1
2
3
4
5
6
Symbol
VIN
GND
C–
SHDN
OUT
C+
Description
Power Supply Input.
Ground.
Commutation Capacitor Negative Terminal.
Shutdown Input (Active High).
Doubled Output Voltage.
Commutation Capacitor Positive Terminal.
TC1240-1 7/7/00 DS21333A
2 © 2001 Microchip Technology Inc.


Part Number TC1240
Description Positive Doubling Charge Pump with Shutdown in SOT Package
Maker Microchip Technology
Total Page 11 Pages
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