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参数资料
| 型号： | TC1237EUNRT |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | MSOP-10 |
| 文件页数： | 1/10页 |
| 文件大小： | 1046K |
| 代理商： | TC1237EUNRT |
TC1235
TC1236
TC1237
TC1235/6/7-1 3/24/00
2001 Microchip Technology Inc.
DS21371A
Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters with Shutdown
FEATURES
s
10-Pin MSOP Package
s
Operates from 1.8V to 5.5V
s
Up to 5mA Output Current at –VIN Pin
s
Up to 1mA Output Current at –2VIN Pin
s
Power-Saving Shutdown Mode
s
–VIN and –2VIN Outputs Available
s
Low Active Supply Current
.......................................... 120
A (MAX) for TC1235
.......................................... 360
A (MAX) for TC1236
.......................................... 1.5mA (MAX) for TC1237
s
Fully Compatible with 1.8V Logic Systems
TYPICAL APPLICATIONS
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LCD Panel Bias
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Cellular Phones PA Bias
s
Pagers
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PDAs, Portable Dataloggers
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Battery Powered Devices
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
A of
supply current.
These devices provide both a negative voltage inver-
sion (available at the –VIN output), and a negative doubling
voltage inversion (available at the –2 VIN output) with a low
output impedance capable of providing output currents up to
5mA for the –VIN output and 1mA for the –2VIN output. The
input voltage can range from +1.8V to +5.5V.
ORDERING INFORMATION
Part No.
Package Osc Freq (KHz) Temp Range
TC1235EUN
10-Pin MSOP
12
–40
°C to +85°C
TC1236EUN
10-Pin MSOP
35
–40
°C to +85°C
TC1237EUN
10-Pin MSOP
125
–40
°C to +85°C
TYPICAL OPERATING CIRCUIT
C1+
C2+
SHDN
VIN
–VIN
C1–
C2
C2–
C1
TC1235
TC1236
TC1237
COUT1
ON
OFF
NC
–2 VIN
+
COUT2
+
OUTPUT 1
OUTPUT 2
INPUT
GND
Notes:
1) C1 and COUT1 must have a voltage rating greater
than or equal to VIN
2) C2 and COUT2 must have a voltage rating greater
than or equal to 2VIN
GND
10-Pin MSOP
TC1235
–2 VIN
1
2
3
4
5
10
9
8
7
6
TC1236
TC1237
C1–
C2–
C1+
C2+
NC
–VIN
SHDN
VIN
PIN CONFIGURATION
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