Rainbow Electronics MAX684 User Manual
General description, Applications, Features
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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.
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
Features
♦
Ultra-Small: 1µF Capacitors per 100mA of Output
Current
♦
No Inductors Required
♦
1.1mm Height in µMAX Package (MAX683/MAX684)
♦
Up to 250mA Output Current (MAX682)
♦
Regulated ±4% Output Voltage
♦
50kHz to 2MHz Adjustable Switching Frequency
♦
2.7V to 5.5V Input Voltage
♦
100µA Quiescent Current in Pulse-Skipping Mode
♦
0.1µA Shutdown Current
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
________________________________________________________________
Maxim Integrated Products
1
CXN
PGND
GND
1
2
8
7
OUT
CXP
SHDN
IN
SKIP
SO
TOP VIEW
3
4
6
5
MAX682
CXN
PGND
GND
1
2
8
7
OUT
CXP
SHDN
IN
SKIP
µ
MAX
3
4
6
5
MAX683
MAX684
Pin Configurations
OUTPUT
5V/250mA
OUT
SHDN
IN
INPUT
2.7V TO 5.5V
SKIP
R
EXT
GND
PGND
CXN
CXP
MAX682
Typical Operating Circuit
19-0177; Rev 1; 8/98
PART
MAX682
ESA
MAX683
EUA
MAX684
EUA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
8 SO
8 µMAX
8 µMAX
Ordering Information