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TC1221ECH Datasheet

  • TC1221ECH

  • High Frequency Switched Capacitor Voltage Converters with Sh...

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  • MICROCHIP   MICROCHIP

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M
Features
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TC1221/TC1222
General Description
The TC1221/TC1222 are CMOS 鈥渃harge-pump鈥?/div>
voltage converters in ultra-small 6-Pin SOT-23A
packages. They invert and/or double an input voltage
which can range from +1.8V to +5.5V. Conversion
efficiency is typically 96%. Switching frequency is
125kHz for the TC1221, 750kHz for the TC1222. When
the shutdown pin is held at a logic low, the device goes
into a very low power mode of operation, consuming
less than 1碌A(chǔ) of supply current.
For standard voltage inverter applications, the device
requires only two external capacitors. 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 290碌A(chǔ) (TC1221) and 1800碌A(chǔ) (TC1222).
All devices are available in 6-pin SOT-23A surface
mount packages.
High Frequency Switched Capacitor Voltage Converters
with Shutdown in SOT Packages
Charge Pumps in 6-Pin SOT-23A Package
96% Voltage Conversion Efficiency
Voltage Inversion and/or Doubling
Operates from +1.8V to +5.5V
Up to 25mA Output Current
Only Two External Capacitors Required
Power-Saving Shutdown Mode
Fully Compatible with 1.8V Logic Systems
Applications
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LCD Panel Bias
Cellular Phones
Pagers
PDAs, Portable Data Loggers
Battery-Powered Devices
Device Selection Table
Part
Number
Package
Osc.
Freq.
(kHz)
125
750
Operating
Temp.
Range
-40擄C to +85擄C
-40擄C to +85擄C
Functional Block Diagram
Negative Voltage Inverter
C+
+
C1
C鈥?/div>
V
IN
Input
TC1221ECH 6-Pin SOT-23A
TC1222ECH 6-Pin SOT-23A
TC1221
TC1222
ON
SHDN
OFF
V鈥?/div>
Output
C2
+
Package Type
6-Pin SOT-23A
OUT
C+
6
SHDN
5
GND
4
GND
TC1221ECH
TC1222ECH
1
OUT
2
V
IN
3
C鈥?/div>
NOTE:
6-Pin SOT-23A is equivalent to the EIAJ SC-74
錚?/div>
2002 Microchip Technology Inc.
DS21367B-page 1

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