19-2107; Rev 2; 6/09
Regulated 3.3V/5.0V Step-Up/Step-Down
Charge Pump
General Description
Features
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.
♦ Ultra-Small: Requires Only Three Ceramic
Capacitors
♦ No Inductors Required
♦ Up to 125mA Output Current
♦ Regulated ±±3 Output ꢀoltage
♦ 1MHz Switching Frequency
♦ 1.8ꢀ to 5.5ꢀ Input ꢀoltage
♦ 220µA Quiescent Current
♦ 0.1µA Shutdown Current
♦ Load Disconnect in Shutdown
Applications
Ordering Information
White LED Power
PART
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
Flash Memory Supplies
MAX1595EUA33+
MAX1595ETC33+
MAX1595EUA50+
Battery-Powered Applications
Miniature Equipment
12 Thin QFN-EP*
8 µMAX
PCMCIA Cards
MAX1595ETC50+
12 Thin QFN-EP*
3.3V to 5V Local Conversion Applications
Backup-Battery Boost Converters
3V to 5V GSM SIMM Cards
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Selector Guide
PART
ꢀ
OUT
(ꢀ)**
TOP MARK
UDAA
AAEH
MAX1595EUA33+
MAX1595ETC33+
MAX1595EUA50+
3.3
3.3
5.0
5.0
UJAN
Typical Operating Circuit
MAX1595ETC50+
AAEI
**Contact factory for other fixed-output voltages from 2.7V to 5.0V.
Pin Configurations
CXN
CXP
TOP VIEW
MAX1595
INPUT
OUTPUT
IN
OUT
AOUT
AOUT
SHDN
IN
1
2
3
4
8
7
6
5
OUT
SHDN
CXP
MAX1595
CXN
PGND
PGND GND
GND
μMAX
Pin Configurations continued at end of data sheet.
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.