19-0177; Rev 1; 8/98
3.3V-Input to Regulated 5V-Output
Charge Pumps
General Description
The MAX682/MAX683/MAX684 charge-pump regula-
tors generate 5V from a 2.7V to 5.5V input. They are
specifically designed to serve as high-efficiency auxil-
iary supplies in applications that demand a compact
design. The MAX682, MAX683, and MAX684 deliver
250mA, 100mA, and 50mA output current, respectively.
These complete 5V regulators require only one resistor
and three external capacitors—no inductors are need-
ed. 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 space-
saving 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
MAX682/MAX683/MAX684
Applications
Flash Memory Supplies
Battery-Powered Applications
Miniature Equipment
PCMCIA Cards
3.3V to 5V Local Conversion Applications
Backup-Battery Boost Converters
3V to 5V GSM SIMM Cards
PART
MAX682ESA
MAX683EUA
MAX684EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 µMAX
8 µMAX
Typical Operating Circuit
TOP VIEW
CXN
INPUT
2.7V TO 5.5V
R
EXT
CXP
SKIP
1
8
7
Pin Configurations
OUT
CXP
CXN
PGND
SKIP
SHDN
IN
1
2
3
8
7
OUT
CXP
CXN
PGND
MAX682
IN
SKIP
SHDN
GND
PGND
OUT
OUTPUT
5V/250mA
SHDN
IN
2
MAX682
3
6
5
GND
4
GND
4
MAX683
MAX684
6
5
SO
µMAX
________________________________________________________________
Maxim Integrated Products
1
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For small orders, phone 408-737-7600 ext. 3468.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
