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參數(shù)資料
| 型號： | TC1684EUA |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 228K |
| 代理商： | TC1684EUA |
2005 Microchip Technology Inc.
DS21537C-page 1
TC1682/TC1683/TC1684
Features
Small 8-Pin MSOP Package
Operates from 1.8V to 5.5V
120 Ohms (typ) Output Resistance
99% Voltage Conversion Efficiency
Only 3 External Capacitors Required
Power-Saving Shutdown Mode
Low Active Supply Current
-95
μA (typ) for TC1682
-225
μA (typ) for TC1683
-700
μA (typ) for TC1684
Fully Compatible with 1.8V Logic Systems
Applications
LCD Panel Bias
Cellular Phones PA Bias
Pagers
PDAs, Portable Data Loggers
Battery-Powered Devices
Device Selection Table
Package Type
General Description
The TC1682/TC1683/TC1684 are CMOS charge pump
converters that provide an inverted doubled output
from a single positive supply. An on-board oscillator
provides the clock and only three external capacitors
are required for full circuit implementation. Switching
frequencies are 12kHz for the TC1682, 35kHz for the
TC1683, and 125kHz for the TC1684. When the SHDN
pin is held at a logic high, the device goes into a very
low power mode of operation consuming less than 1
μA
(typ) of supply current.
Low output source impedance (typically
120
Ω),
provides output current up to 10mA. The TC1682/
TC1683/TC1684 feature a 1.8V to 5.5V operating
voltage range and high efficiency, which make them an
ideal choice for a wide variety of applications requiring
a negative doubled voltage derived from a single
positive supply (for example: generation of -7.2V from
a +3.6V lithium cell or -10V generated from a +5V logic
supply).
The minimum external part count, small physical size
and shutdown mode feature make this family of
products useful for a wide variety of negative bias
power supply applications.
Functional Block Diagram
Part
Number
Package
Osc.
Freq.
(kHz)
Operating
Temp.
Range
TC1682EUA
8-Pin MSOP
12
-40°C to +85°C
TC1683EUA
8-Pin MSOP
35
-40°C to +85°C
TC1684EUA
8-Pin MSOP
125
-40°C to +85°C
1
2
3
4
8
7
6
5
TC1682
TC1683
TC1684
VOUT
SHDN
VIN
C2–
GND
C1–
C1+
C2+
8-Pin MSOP
C1+
C2+
VIN
C1–
C2
C2–
C1
TC1682
TC1683
TC1684
VOUT
+
– C
OUT
Input
GND
C1 must have a voltage rating
≥ VIN
C2 and COUT must have a voltage rating ≥ 2VIN
VOUT = -(2 x VIN)
SHDN
ON
OFF
Inverting Charge Pump Voltage Doublers with Active High Shutdown
Obsolete Device
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