19-2107; Rev 1; 8/02
Regulated 3.3V/5.0V Step-Up/Step-Down
Charge Pump
General Description
The MAX1595 charge-pump regulator generates either
3.3V or 5V from a 1.8V to 5.5V input. The unique control
architecture allows the regulator to step up or step
down the input voltage to maintain output regulation.
The 1MHz switching frequency, combined with a
unique control scheme, allows the use of a ceramic
capacitor as small as 1µF for 125mA of output current.
The complete regulator requires three external capaci-
tors—no inductor is needed. The MAX1595 is specifi-
cally designed to serve as a high-power, high-
efficiency auxiliary supply in applications that demand
a compact design. The MAX1595 is offered in space-
saving 8-pin µMAX and high-power 12-pin thin QFN
packages.
Features
o
Ultra-Small: Requires Only Three Ceramic
Capacitors
o
No Inductors Required
o
Up to 125mA Output Current
o
Regulated ±3% Output Voltage
o
1MHz Switching Frequency
o
1.8V to 5.5V Input Voltage
o
220µA Quiescent Current
o
0.1µA Shutdown Current
o
Load Disconnect in Shutdown
MAX1595
Applications
White LED Power
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
MAX1595EUA33
MAX1595ETC33
MAX1595EUA50
PART
MAX1595EUA33
MAX1595ETC33
MAX1595EUA50
MAX1595ETC50
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
12 Thin QFN
8 µMAX
12 Thin QFN
Selector Guide
V
OUT
*
3.3V
3.3V
5.0V
TOP MARK
—
AAAP
—
Typical Operating Circuit
MAX1595ETC50
AAAM
5.0V
*Contact
factory for other fixed-output voltages from 2.7V to 5.0V.
Pin Configurations
CXN
CXP
INPUT
MAX1595
IN
OUT
AOUT
SHDN
PGND GND
OUTPUT
TOP VIEW
AOUT
SHDN
IN
GND
1
2
3
4
8
OUT
CXP
CXN
PGND
MAX1595
7
6
5
µMAX
Pin Configurations continued at end of data sheet.
Maxim Integrated Products
1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
