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TC1235EUN Datasheet

  • TC1235EUN

  • Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters ...

  • 10頁

  • MICROCHIP   MICROCHIP

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TC1235
TC1236
TC1237
Inverting Dual (鈥揤
IN
, 鈥?V
IN
) Charge Pump Voltage Converters with Shutdown
FEATURES
s
s
s
s
s
s
s
10-Pin MSOP Package
Operates from 1.8V to 5.5V
Up to 5mA Output Current at 鈥揤
IN
Pin
Up to 1mA Output Current at 鈥?V
IN
Pin
Power-Saving Shutdown Mode
鈥揤
IN
and 鈥?V
IN
Outputs Available
Low Active Supply Current
.......................................... 120
碌
A (MAX) for TC1235
.......................................... 360
碌
A (MAX) for TC1236
.......................................... 1.5mA (MAX) for TC1237
Fully Compatible with 1.8V Logic Systems
GENERAL DESCRIPTION
The TC1235/1236/1237 are CMOS dual inverting
charge pump voltage converters with a low power shutdown
mode in MSOP 10-Pin packages. Only four external capaci-
tors are required for full circuit implementation. Switching
frequencies are 12kHz for the TC1235, 35kHz for the
TC1236 and 125kHz for the TC1237. 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 of
supply current.
These devices provide both a negative voltage inver-
sion (available at the 鈥揤
IN
output), and a negative doubling
voltage inversion (available at the 鈥? V
IN
output) with a low
output impedance capable of providing output currents up to
5mA for the 鈥揤
IN
output and 1mA for the 鈥?V
IN
output. The
input voltage can range from +1.8V to +5.5V.
s
TYPICAL APPLICATIONS
s
s
s
s
s
LCD Panel Bias
Cellular Phones PA Bias
Pagers
PDAs, Portable Dataloggers
Battery Powered Devices
ORDERING INFORMATION
Part No.
TC1235EUN
TC1236EUN
TC1237EUN
Package Osc Freq (KHz) Temp Range
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
12
35
125
鈥?0擄C to +85擄C
鈥?0擄C to +85擄C
鈥?0擄C to +85擄C
PIN CONFIGURATION
TYPICAL OPERATING CIRCUIT
INPUT
V
IN
OUTPUT 1
鈥揤
IN
10-Pin MSOP
+
C1
C1+
C1鈥?/div>
C2+
C1鈥?/div>
C2+
NC
C2鈥?/div>
鈥? V
IN
Notes:
1
2
3
4
10
9
鈥揤
IN
C1+
SHDN
V
IN
GND
+
C2
+
TC1235
TC1236
TC1237 SHDN
鈥? V
IN
C
OUT1
ON
OFF
C2鈥?/div>
TC1235
TC1236
TC1237
8
7
GND
NC
OUTPUT 2
+
C
OUT2
5
6
1) C1 and C
OUT1
must have a voltage rating greater
than or equal to V
IN
2) C2 and C
OUT2
must have a voltage rating greater
than or equal to 2V
IN
DS21371A
漏 2001 Microchip Technology Inc.
TC1235/6/7-1 3/24/00

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