MAX828 Datasheet, PDF (1/8 Pages) ON Semiconductor – Switched Capacitor Voltage Converters

19-0495; Rev 2; 4/97
Switched-Capacitor Voltage Inverters
_______________General Description
The ultra-small MAX828/MAX829 monolithic, CMOS
charge-pump inverters accept input voltages ranging
from +1.5V to +5.5V. The MAX828 operates at 12kHz,
and the MAX829 operates at 35kHz. Their high efficiency
(greater than 90% over most of the load-current range)
and low operating current (60µA for the MAX828) make
these devices ideal for both battery-powered and board-
level voltage-conversion applications.
The MAX828/MAX829 combine low quiescent current
and high efficiency. Oscillator control circuitry and four
power MOSFET switches are included on-chip.
Applications include 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
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
____________________________Features
o 5-Pin SOT23-5 Package
o 95% Voltage Conversion Efficiency
o Inverts Input Supply Voltage
o 60µA Quiescent Current (MAX828)
o +1.5V to +5.5V Input Voltage Range
o Requires Only Two Capacitors
o 25mA Output Current
______________Ordering Information
PART
TEMP. RANGE
MAX828C/D
MAX828EUK
MAX829C/D
MAX829EUK
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
—
AABI
—
AABJ
__________Typical Operating Circuit __________________Pin Configuration
5
C1+
2
IN
3
C1-
4
GND
MAX828
MAX829
OUT ¹
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
NEGATIVE VOLTAGE CONVERTER
TOP VIEW
OUT 1
5 C1+
MAX828
IN 2 _MAX829
C1- 3
4 GND
SOT23-5
________________________________________________________________ Maxim Integrated Products 1
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