MAX870 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 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.
________________________Applications
Local -5V Supply from 5V Logic Supply
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
____________________________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
______________Ordering Information
PART
TEMP. RANGE
MAX870C/D
MAX870EUK
MAX871C/D
MAX871EUK
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
* Dice are tested at T_A = +25°C.
PIN-
PACKAGE
Dice*
5 SOT23-5
Dice*
5 SOT23-5
SOT
TOP MARK
—
ABZN
—
ABZO
__________Typical Operating Circuit __________________Pin Configuration
5
C1+
2
IN
3
C1-
4
GND
MAX870
MAX871
OUT ¹
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
NEGATIVE VOLTAGE CONVERTER
TOP VIEW
OUT 1
5 C1+
MAX870
IN 2 _MAX871
C1- 3
4 GND
SOT23-5
________________________________________________________________ Maxim Integrated Products 1
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