19-0177; Rev 1; 8/98
3.3V-Input to Regulated 5V-Output
Charge Pumps
These complete 5V regulators require only one resistor
and three external capacitors—no inductors are needed. High switching frequencies (externally adjustable
up to 2MHz) and a unique regulation scheme allow the
use of capacitors as small as 1µF per 100mA of output
current. The MAX683/MAX684 are offered in a spacesaving 8-pin µMAX package that is only 1.1mm high,
while the MAX682 is available in an 8-pin SO.
Features
o Ultra-Small: 1µF Capacitors per 100mA of Output
Current
o No Inductors Required
o 1.1mm Height in µMAX Package (MAX683/MAX684)
o Up to 250mA Output Current (MAX682)
o Regulated ±4% Output Voltage
o 50kHz to 2MHz Adjustable Switching Frequency
o 2.7V to 5.5V Input Voltage
o 100µA Quiescent Current in Pulse-Skipping Mode
o 0.1µA Shutdown Current
Applications
Ordering Information
Flash Memory Supplies
Battery-Powered Applications
PART
TEMP. RANGE
PIN-PACKAGE
-40°C to +85°C
8 SO
MAX683EUA
-40°C to +85°C
8 µMAX
MAX684EUA
-40°C to +85°C
8 µMAX
Miniature Equipment
MAX682ESA
PCMCIA Cards
3.3V to 5V Local Conversion Applications
Backup-Battery Boost Converters
3V to 5V GSM SIMM Cards
Typical Operating Circuit
Pin Configurations
TOP VIEW
CXN
CXP
SKIP 1
MAX682
INPUT
2.7V TO 5.5V
IN
REXT
OUT
SHDN
7
2
OUT
CXP
SKIP 1
SHDN
3
6
CXN
IN
GND 4
SHDN
PGND
8
5
PGND
CXP
6
CXN
5
GND 4
SO
3
MAX683
MAX684
OUT
7
2
MAX682
IN
SKIP
GND
OUTPUT
5V/250mA
8
PGND
µMAX
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX682/MAX683/MAX684
General Description
The MAX682/MAX683/MAX684 charge-pump regulators generate 5V from a 2.7V to 5.5V input. They are
specifically designed to serve as high-efficiency auxiliary supplies in applications that demand a compact
design. The MAX682, MAX683, and MAX684 deliver
250mA, 100mA, and 50mA output current, respectively.
