19-1240; Rev 0; 6/97
S w it c h e d -Ca p a c it o r Vo lt a g e In ve rt e rs
0/MAX871
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 5-Pin SOT23-5 Package
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-
c y (90%) a nd low op e ra ting c urre nt (0.7mA for the
MAX870) make these devices ideal for both battery-pow-
ered and board-level voltage-conversion applications.
♦ 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
s witc he s a re inc lud e d on-c hip . A typ ic a l 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 applications requiring more power, the MAX860
delivers up to 50mA with a voltage drop of 600mV, in a
space-saving µMAX package.
______________Ord e rin g In fo rm a t io n
PIN-
SOT
PART
TEMP. RANGE
PACKAGE TOP MARK
________________________Ap p lic a t io n s
Local -5V Supply from 5V Logic Supply
Small LCD Panels
MAX870C/D
0°C to +70°C
Dice*
—
MAX870EUK -40°C to +85°C
MAX871C/D 0°C to +70°C
MAX871EUK -40°C to +85°C
* Dice are tested at T = +25°C.
5 SOT23-5
Dice*
ABZN
—
5 SOT23-5
ABZO
Cell Phones
A
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
__________________P in Co n fig u ra t io n
__________Typ ic a l Op e ra t in g Circ u it
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 free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800