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TC1222 데이터시트 PDF




Microchip Technology에서 제조한 전자 부품 TC1222은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 TC1222 기능
기능 (TC1221) High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages
제조업체 Microchip Technology
로고 Microchip Technology 로고


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TC1222 데이터시트, 핀배열, 회로
M TC1221/TC1222
High Frequency Switched Capacitor Voltage Converters
with Shutdown in SOT Packages
Features
• 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
• LCD Panel Bias
• Cellular Phones
• Pagers
• PDAs, Portable Data Loggers
• Battery-Powered Devices
Device Selection Table
Part
Number
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC1221ECH 6-Pin SOT-23A 125 -40°C to +85°C
TC1222ECH 6-Pin SOT-23A 750 -40°C to +85°C
Package Type
6-Pin SOT-23A
C+ SHDN GND
6 54
TC1221ECH
TC1222ECH
1
OUT
2
VIN
3
C–
NOTE: 6-Pin SOT-23A is equivalent to the EIAJ SC-74
General Description
The TC1221/TC1222 are CMOS “charge-pump”
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 1µA 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 290µA (TC1221) and 1800µA (TC1222).
All devices are available in 6-pin SOT-23A surface
mount packages.
Functional Block Diagram
Negative Voltage Inverter
C+ VIN
Input
+
C1 TC1221
TC1222
CON
SHDN
OFF
GND
OUT
C2
+
V
Output
2002 Microchip Technology Inc.
DS21367B-page 1




TC1222 pdf, 반도체, 판매, 대치품
TC1221/TC1222
3.0 DETAILED DESCRIPTION
The TC1221/TC1222 charge pump converters invert
the voltage applied to the VIN pin. Conversion consists
of a two-phase operation (Figure 3-1). During the first
phase, switches S2 and S4 are opened and S1 and S3
are closed. During this time, C1 charges to the voltage
on VIN and load current is supplied from C2. During the
second phase, S2 and S4 are closed, and S1 and S3
are opened. This action connects C1 across C2,
restoring charge to C2.
FIGURE 3-1:
IDEAL SWITCHED
CAPACITOR CHARGE
PUMP
S1
VIN
S2
C1
TC1221/1222
S3 S4
C2
VOUT = (VIN)
OSC
Phase 1
DS21367B-page 4
2002 Microchip Technology Inc.

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TC1222 전자부품, 판매, 대치품
TC1221/TC1222
4.7 Cascading Devices
Two or more TC1221/TC1222 can be cascaded to
increase output voltage (Figure 4-4). If the output is
lightly loaded, it will be close to (-2 x VIN) but will droop
at least by ROUT of the first device multiplied by the IQ
of the second. It can be seen that the output resistance
rises rapidly for multiple cascaded devices.
4.8 Paralleling Devices
To reduce the value of ROUT, multiple TC1221/
TC1222s can be connected in parallel (Figure 4-5).
The output resistance will be reduced by a factor of N
where N is the number of TC1221/TC1222. Each
device will require its own pump capacitor (C1), but all
devices may share one reservoir capacitor (C2).
However, to preserve ripple performance the value of
C2 should be scaled according to the number of
paralleled TC1221/TC1222.
FIGURE 4-4:
CASCADING MULTIPLE DEVICES TO INCREASE OUTPUT VOLTAGE
C1
+
VIN
3
TC1221
4 TC1222
6 "1"
5 SHDN
...
VIN
2
C1
1
3
TC1221
4 TC1222
+
6 "n"
. . . 5 SHDN
C2
+
VOUT = -nVIN
2
1 VOUT
C2
+
FIGURE 4-5:
PARALLELING MULTIPLE DEVICES TO REDUCE OUTPUT RESISTANCE
ROUT = ROUT OF SINGLE DEVICE
NUMBER OF DEVICES
VIN . . .
VIN
C1
+
Shutdown
Control
3
TC1221
4 TC1222
6 "1"
5 SHDN
22
3
C1
+
TC1221
4 TC1222
1
6 "n"
5 SHDN
1
VOUT
...
VOUT = -VIN
C2
+
2002 Microchip Technology Inc.
DS21367B-page 7

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