19-1744; Rev 1; 1/04
28V Internal Switch LCD Bias Supply
with True Shutdown
Features
The MAX1606 is a step-up DC-DC converter that contains a 0.5A internal power switch and a 0.5A output
isolation switch in an 8-pin µMAX package. The IC
operates from a 2.4V to 5.5V supply voltage but can
boost battery voltages as low as 0.8V up to 28V.
The MAX1606 uses a unique control scheme that provides high efficiency over a wide range of load conditions. An internal 0.5A MOSFET reduces external
component count, and a high switching frequency (up
to 500kHz) allows for tiny surface-mount components.
The current limit can be set to 500mA, 250mA, or
125mA, allowing the user to reduce the output ripple
and component size in low-current applications.
♦ Adjustable Output Voltage up to 28V
Additional features include a low quiescent supply current and a true shutdown mode that saves power by
disconnecting the output from the input. The MAX1606
is ideal for small LCD panels with low current requirements but can also be used in other applications. A
MAX1606 evaluation kit is available to help speed up
design time.
♦ 8-Pin µMAX Package
♦ 20mA at 20V from a Single Li+ Battery
♦ True Shutdown (Output Disconnected from Input)
♦ Output Short-Circuit Protection
♦ 88% Efficiency
♦ Up to 500kHz Switching Frequency
♦ Selectable Inductor Current Limit
(125mA, 250mA, or 500mA)
♦ 0.1µA Shutdown Current
Ordering Information
________________________Applications
LCD Bias Generators
PART
TEMP RANGE
PIN-PACKAGE
MAX1606EUA
Cellular or Cordless Phones
-40°C to +85°C
8 µMAX
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
Pin Configuration
Typical Operating Circuit
VIN = 0.8V TO 5.5V
SW
LX
BATT
VCC
TOP VIEW
BATT
FB
LIM
ON
1
8
FB
MAX1606
VCC = 2.4V TO 5.5V
VOUT = VIN TO 28V
2
7
SHDN
VCC
3
6
LIM
GND
4
5
LX
MAX1606
SW
µMAX
OFF
SHDN
GND
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX1606
General Description
