MAX870EUK+T Maxim Integrated Products, MAX870EUK+T Datasheet

IC VOLT INVERT SW CAP SOT23-5

MAX870EUK+T

Manufacturer Part Number
MAX870EUK+T
Description
IC VOLT INVERT SW CAP SOT23-5
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX871EUKT.pdf (8 pages)

Specifications of MAX870EUK+T

Applications
Charge Pump, LCD
Voltage - Input
1.4 ~ 5.5 V
Number Of Outputs
1
Voltage - Output
-1.4 ~ 5.5 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Function
Inverting
Output Voltage
- 1.4 V to - 5.5 V
Output Current
25 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
19-1240; Rev 1; 2/04
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.
Local -5V Supply from 5V Logic Supply
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
NEGATIVE VOLTAGE CONVERTER
5
3
4
Typical Operating Circuit
C1+
C1-
GND
________________________________________________________________ Maxim Integrated Products
General Description
Switched-Capacitor Voltage Inverters
MAX870
MAX871
OUT
IN
2
1
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
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
MAX870EUK
MAX871EUK
PART
TOP VIEW
OUT
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
C1-
IN
1
2
3
Ordering Information
SOT23-5
MAX870
MAX871
Pin Configuration
5 SOT23-5
5 SOT23-5
PIN-
PACKAGE
5
4
C1+
GND
Features
TOP MARK
ABZN
ABZO
SOT
1

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MAX870EUK+T Summary of contents

Page 1

... MAX871 3 C1- 4 GND NEGATIVE VOLTAGE CONVERTER ________________________________________________________________ Maxim Integrated Products 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. o 5-Pin SOT23-5 Package o 99% Voltage Conversion Efficiency o Invert Input Supply Voltage o 0.7mA Quiescent Current (MAX870 ...

Page 2

Switched-Capacitor Voltage Inverters ABSOLUTE MAXIMUM RATINGS IN to GND ..............................................................+6.0V to -0.3V OUT to GND ..........................................................-6.0V to +0.3V C1+ ..............................................................(V C1-............................................................(V OUT Output Current ...........................................................50mA OUT Short Circuit to GND .............................................Indefinite Stresses beyond those listed under “Absolute Maximum Ratings” may ...

Page 3

Switched-Capacitor Voltage Inverters __________________________________________Typical Operating Characteristics (Circuit of Figure +5V C3 SUPPLY CURRENT vs. SUPPLY VOLTAGE 3.0 2.5 2.0 1.5 MAX871 1.0 MAX870 0.5 0 1.5 2.0 2.5 3.0 3.5 4.0 ...

Page 4

Switched-Capacitor Voltage Inverters ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +5V C3 MAX870 EFFICIENCY vs. OUTPUT CURRENT 100 5. 3. ...

Page 5

Switched-Capacitor Voltage Inverters _______________Detailed Description The MAX870/MAX871 capacitive charge pumps invert the voltage applied to their input. For highest perfor- mance, use low equivalent series resistance (ESR) capacitors (e.g., ceramic). During the first half-cycle, switches S2 and S4 open, switches ...

Page 6

Switched-Capacitor Voltage Inverters Flying Capacitor (C1) Increasing the flying capacitor’s size reduces the output resistance. Small C1 values increase the output resis- tance. Above a certain point, increasing C1’s capaci- tance has a negligible effect, because the output resistance becomes ...

Page 7

Switched-Capacitor Voltage Inverters … MAX870 C1 C1 MAX871 “1” … C2 Figure 4. Cascading MAX870s or MAX871s to Increase Output Voltage Paralleling Devices Paralleling multiple MAX870s or MAX871s reduces the ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2004 Maxim Integrated Products 3 ...

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