MAX870 Datasheet PDF


Part Number

MAX870

Description

Switched-Capacitor Voltage Inverters

Manufacture

Maxim

Total Page 8 Pages
PDF Download
Download MAX870 Datasheet PDF


Features Datasheet pdf 19-1240; Rev 0; 6/97 Switched-Capacitor Voltage Inverters _______________Gener al Description The ultra-small MAX870/M AX871 monolithic, CMOS charge-pump inve rters accept input voltages ranging fro m +1.4V to +5.5V. The MAX870 operates a t 125kHz, and the MAX871 operates at 50 0kHz. Their high efficiency (90%) and l ow operating current (0.7mA for the MAX 870) make these devices ideal for both battery-powered and board-level voltage -conversion applications. Oscillator co ntrol circuitry and four power MOSFET s witches are included on-chip. A typical MAX870/ MAX871 application is generati ng a -5V supply from a +5V logic supply to power analog circuitry. Both parts come in a 5-pin SOT23-5 package and .
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MAX870 Datasheet
19-1240; Rev 1; 2/04
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 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.
________________________Applications
Local -5V Supply from 5V Logic Supply
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
Typical Operating Circuit
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
MAX870EUK
MAX871EUK
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
SOT
TOP MARK
ABZN
ABZO
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
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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