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MAX871C

Description
Switched-Capacitor Voltage Inverters
File Size94KB,8 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Compare View All

MAX871C Overview

Switched-Capacitor Voltage Inverters

19-1240; Rev 0; 6/97
Switched-Capacitor Voltage Inverters
_______________General Description
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.
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.
For applications requiring more power, the MAX860
delivers up to 50mA with a voltage drop of 600mV, in a
space-saving µMAX package.
____________________________Features
o
5-Pin SOT23-5 Package
o
99% Voltage Conversion Efficiency
o
Invert Input Supply Voltage
o
0.7mA Quiescent Current (MAX870)
o
+1.4V to +5.5V Input Voltage Range
o
Require Only Two Capacitors
o
25mA Output Current
o
Shutdown Control
MAX870/MAX871
______________Ordering Information
PART
MAX870C/D
MAX870EUK
MAX871C/D
MAX871EUK
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-
PACKAGE
Dice*
5 SOT23-5
Dice*
5 SOT23-5
SOT
TOP MARK
ABZN
ABZO
________________________Applications
Local -5V Supply from 5V Logic Supply
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
*
Dice are tested at T
A
= +25°C.
__________Typical Operating Circuit
__________________Pin Configuration
5
C1+
IN
2
INPUT
SUPPLY
VOLTAGE
TOP VIEW
MAX870
MAX871
3
C1-
OUT
4
1
NEGATIVE
OUTPUT
VOLTAGE
OUT
1
5
C1+
IN
2
MAX870
MAX871
4
GND
C1-
3
GND
SOT23-5
NEGATIVE VOLTAGE CONVERTER
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

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