Rainbow Electronics MAX829 - Manual

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 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.
Applications
Small LCD Panels
Cell Phones
Medical Instruments
Handy-Terminals, PDAs
Battery-Operated Equipment
Features
♦ 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
MAX828/MAX829
Switched-Capacitor Voltage Inverters
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
IN
GND C1-
C1+ OUT
SOT23-5
1 5
MAX828
MAX829
2
3 4
Pin Configuration
NEGATIVE VOLTAGE CONVERTER
C1+
C1-
IN
OUT
GND
INPUT
SUPPLY
VOLTAGE
NEGATIVE
OUTPUT
VOLTAGE
MAX828
MAX829
4
3
5 2
1
Typical Operating Circuit
19-0495; Rev 3; 9/99
PART
MAX828EUK -40°C to +85°C
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
Ordering Information
MAX829EUK -40°C to +85°C 5 SOT23-5
SOT
TOP MARK
AABI
AABJ
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.