19-0495; Rev 3; 9/99
Switched-Capacitor Voltage Inverters
General Description
Features
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.
ꢀ 5-Pin SOT23-5 Package
ꢀ 95% Voltage Conversion Efficiency
ꢀ Inverts Input Supply Voltage
ꢀ 60µA Quiescent Current (MAX828)
ꢀ +1.5V to +5.5V Input Voltage Range
ꢀ Requires Only Two Capacitors
ꢀ 25mA Output Current
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.
Ordering Information
For a similar device with logic-controlled shutdown,
refer to the MAX1719/MAX1720/MAX1721. For applica-
tions requiring more power, the MAX860 delivers up to
50mA with a voltage drop of 600mV, in a space-saving
µMAX package.
PIN-
SOT
PART
TEMP. RANGE
PACKAGE TOP MARK
MAX828EUK -40°C to +85°C
MAX829EUK -40°C to +85°C
5 SOT23-5
5 SOT23-5
AABI
AABJ
Applications
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
Pin Configuration
Typical Operating Circuit
TOP VIEW
INPUT
SUPPLY
VOLTAGE
5
2
IN
C1+
OUT
IN
1
2
3
C1+
5
4
MAX828
MAX829
MAX828
MAX829
3
4
C1-
NEGATIVE
OUTPUT
VOLTAGE
1
OUT
C1-
GND
GND
SOT23-5
NEGATIVE VOLTAGE CONVERTER
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.