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MAX870

更新时间: 2024-11-01 14:57:19
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描述
开关电容电压反相器

MAX870 数据手册

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19-1240; Rev 1; 2/04  
Switched-Capacitor Voltage Inverters  
General Description  
Features  
The ultra-small MAX870/MAX871 monolithic, CMOS  
charge-pump inverters accept input voltages ranging  
from +1.4V to +5.5V. The MAX870 operates at 125kHz,  
and the MAX871 operates at 500kHz. Their high efficien-  
cy (90%) and low operating current (0.7mA for the  
MAX870) make these devices ideal for both battery-pow-  
ered and board-level voltage-conversion applications.  
5-Pin SOT23-5 Package  
99% Voltage Conversion Efficiency  
Invert Input Supply Voltage  
0.7mA Quiescent Current (MAX870)  
+1.4V to +5.5V Input Voltage Range  
Require Only Two Capacitors  
25mA Output Current  
Oscillator control circuitry and four power MOSFET  
switches are included on-chip. A typical MAX870/  
MAX871 application is generating a -5V supply from a  
+5V logic supply to power analog circuitry. Both parts  
come in a 5-pin SOT23-5 package and can deliver 25mA  
with a voltage drop of 500mV.  
Shutdown Control  
For a similar device with logic-controlled shutdown,  
refer to the MAX1720/MAX1721. For applications  
requiring more power, the MAX860 delivers up to 50mA  
with a voltage drop of 600mV, in a space-saving µMAX  
package.  
Ordering Information  
PIN-  
SOT  
PART  
TEMP RANGE  
PACKAGE TOP MARK  
MAX870EUK  
MAX871EUK  
-40°C to +85°C 5 SOT23-5  
-40°C to +85°C 5 SOT23-5  
ABZN  
ABZO  
________________________Applications  
Local -5V Supply from 5V Logic Supply  
Small LCD Panels  
Cell Phones  
Medical Instruments  
Handy-Terminals, PDAs  
Battery-Operated Equipment  
Pin Configuration  
Typical Operating Circuit  
TOP VIEW  
INPUT  
SUPPLY  
VOLTAGE  
5
2
IN  
C1+  
MAX870  
MAX871  
OUT  
IN  
1
2
3
C1+  
5
4
MAX870  
MAX871  
3
4
C1-  
NEGATIVE  
OUTPUT  
VOLTAGE  
1
OUT  
C1-  
GND  
GND  
SOT23-5  
NEGATIVE VOLTAGE CONVERTER  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  

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