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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1222 Datasheet

(TC1221) High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages

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TC1222 pdf
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


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1222 Datasheet

(TC1221) High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages

No Preview Available !

TC1222 pdf
TC1221/TC1222
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (VIN to GND)....................... +6.0V, -0.3V
Output Voltage (OUT to GND).................. -6.0V, +0.3V
Current at OUT Pin..............................................50mA
Short-Circuit Duration OUT to GND ............Indefinite
Power Dissipation (TA 70°C)
6-Pin SOT-23A .........................................240mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature (Unbiased) .......-65°C to +150°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent 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
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC1121 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = -40°C to +85°C, VIN = +5V, C1 = C2 = 1µF, (TC1221), C1 = C2 = 0.22µF (TC1222), Typical values
are at TA = +25°C.
Symbol
Parameter
Min Typ Max Units Device
Test Conditions
IDD Supply Current
290 600
1800 2800
µA TC1221
TC1222
ISHDN
VMIN
VMAX
FOSC
Shutdown Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
0.01 1.0
1.8
— — 5.5
81 125
550 750
169
950
µA
V
V
kHz TC1221
TC1222
SHDN = GND, VIN = 5V (Note 2)
RLOAD = 1k
RLOAD = 1k
VIH
VIL
PEFF
SHDN Input Logic High
SHDN Input Logic Low
Power Efficiency
1.4
——
90
70
0.4
V VIN = VMIN to VMAX
V VIN = VMIN to VMAX
% TC1221 RLOAD = 1k
TC1222
VEFF
ROUT
Voltage Conversion Efficiency
Output Resistance
94 96
25
65
%
RLOAD =
ILOAD = 0.5mA to 25mA (Note 1)
TWK Wake-up Time From Shutdown 80 µsec TC1221 RLOAD = 1k
Mode
25
TC1222
Note 1: Capacitor contribution is approximately 20% of the output impedance [ESR = 1/ pump frequency x capacitance].
2: VIN is guaranteed to be disconnected from OUT when the converter is in shutdown..
DS21367B-page 2
2002 Microchip Technology Inc.


Part Number TC1222
Description (TC1221) High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages
Maker Microchip Technology
Total Page 16 Pages
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