Rainbow Electronics MAX871 - Manual

_______________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.
________________________Applications
Local -5V Supply from 5V Logic Supply
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
____________________________Features
♦ 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
♦ Shutdown Control
MAX870/MAX871
Switched-Capacitor Voltage Inverters
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
IN
GND C1-
C1+ OUT
SOT23-5
1 5
MAX870
MAX871
2
3 4
__________________Pin Configuration
NEGATIVE VOLTAGE CONVERTER
C1+
C1-
IN
OUT
GND
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
MAX870
MAX871
4
3
5 2
1
__________Typical Operating Circuit
19-1240; Rev 0; 6/97
PART
MAX870 C/D
MAX870EUK -40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-
PACKAGE
Dice*
5 SOT23-5
______________Ordering Information
* Dice are tested at T A = +25°C.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX871 C/D
MAX871EUK -40°C to +85°C
0°C to +70°C Dice*
5 SOT23-5
SOT
TOP MARK
—
ABZN
—
ABZO