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TC1219 Datasheet, PDF (1/16 Pages) Microchip Technology – Switched Capacitor Voltage Converters with Shutdown in SOT Packages | |||
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M TC1219/TC1220
Switched Capacitor Voltage Converters with Shutdown in SOT Packages
Features
⢠Charge Pumps in 6-Pin SOT-23A Package
⢠>95% Voltage Conversion Efficiency
⢠Voltage Inversion and/or Doubling
⢠Operates from +2.5V to +5.5V
⢠Up to 25mA Output Current
⢠Only Two External Capacitors Required
⢠Low Power Consumption
⢠Power-Saving Shutdown Mode
⢠TC1220 Compatible with 1.8V Logic Systems
Applications
⢠LCD Panel Bias
⢠Cellular Phones
⢠Pagers
⢠PDAs, Portable Dataloggers
⢠Battery-Powered Devices
Device Selection Table
Part
Number
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC1219ECH 6-Pin SOT-23A 12 -40°C to +85°C
TC1220ECH 6-Pin SOT-23A 35 -40°C to +85°C
Package Type
6-Pin SOT-23A
C+ SHDN GND
6
5
4
TC1219ECH
TC1220ECH
1
2
3
OUT VIN
Câ
NOTE: 6-Pin SOT-23A is equivalent to the EIAJ SC-74
General Description
The TC1219/TC1220 are CMOS âcharge-pumpâ
voltage converters in ultra-small 6-Pin SOT-23A
packages. They invert and/or double an input voltage
which can range from +2.5V to +5.5V. Conversion
efficiency is typically >95%. Switching frequency is
12kHz for the TC1219, 35kHz for the TC1220. When
the shutdown pin is held at a logic low, the device goes
into a very low power mode of operation, consuming
less than 1µA of supply current.
External component requirement is only two capacitors
for standard voltage inverter applications. With a few
additional components a positive doubler can also be
built. All other circuitry, including control, oscillator,
power MOSFETs are integrated on-chip. Typical supply
currents are 60µA (TC1219), 115µA (TC1220).
All devices are available in 6-pin SOT-23A surface
mount packages.
Functional Block Diagram
Negative Voltage Inverter
C+
VIN
+
C1
TC1219
TC1220
Câ
Input
ON
SHDN
OFF
GND
OUT
C2
+
Vâ
Output
 2002 Microchip Technology Inc.
DS21366B-page 1
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