MAX1595_09 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Regulated 3.3V/5.0V Step-Up/Step-Down Charge Pump

19-2107; Rev 2; 6/09
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.
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
Typical Operating Circuit
INPUT
CXN
CXP
MAX1595
IN
OUT
SHDN
AOUT
PGND GND
OUTPUT
Features
♦ Ultra-Small: Requires Only Three Ceramic
Capacitors
♦ No Inductors Required
♦ Up to 125mA Output Current
♦ Regulated ±3% Output Voltage
♦ 1MHz Switching Frequency
♦ 1.8V to 5.5V Input Voltage
♦ 220µA Quiescent Current
♦ 0.1µA Shutdown Current
♦ Load Disconnect in Shutdown
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1595EUA33+ -40°C to +85°C ^{8 µMAX}
MAX1595ETC33+ _{-40°C to +85°C} 12 Thin QFN-EP*
MAX1595EUA50+ _{-40°C to +85°C} 8 µMAX
MAX1595ETC50+ _{-40°C to +85°C} 12 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Selector Guide
PART
V_OUT (V)**
TOP MARK
MAX1595EUA33+
3.3
UDAA
MAX1595ETC33+
3.3
AAEH
MAX1595EUA50+
5.0
UJAN
MAX1595ETC50+
5.0
AAEI
**Contact factory for other fixed-output voltages from 2.7V to 5.0V.
Pin Configurations
TOP VIEW
AOUT 1
SHDN 2
IN 3
GND 4
MAX1595
μMAX
8 OUT
7 CXP
6 CXN
5 PGND
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.