Rainbow Electronics MAX1595 - Manual

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2
3
4
8
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5
OUT
CXP
CXN
PGND GND
IN
SHDN
AOUT
MAX1595
µMAX
TOP VIEW
OUTPUT OUT IN INPUT
SHDN
GND
CXN CXP
PGND
AOUT
MAX1595
MAX1595
Regulated 3.3V/5.0V Step-Up/Step-Down
Charge Pump
Maxim Integrated Products 1
Typical Operating Circuit
19-2107; Rev 1; 8/02
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
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
MAX1595EUA50 -40°C to +85°C 8 µMAX
MAX1595ETC50 -40°C to +85°C 12 Thin QFN
Pin Configurations continued at end of data sheet.
Selector Guide
PART V OUT * TOP M ARK
MAX1595EUA33 3.3V —
MAX1595ETC33 3.3V AAAP
MAX1595EUA50 5.0V —
MAX1595ETC50 5.0V AAAM
*Contact factory for other fixed-output voltages from 2.7V to 5.0V.
Pin Configurations