19-1666; Rev 1; 10/03
30V Internal Switch LCD Bias Supply
General Description
Features
The MAX1605 boost converter contains a 0.5A internal
switch in a tiny 6-pin SOT23 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 30V at the output.
o Adjustable Output Voltage up to 30V
o 20mA at 20V from a Single Li+ Battery
o 88% Efficiency
The MAX1605 uses a unique control scheme providing
the highest efficiency over a wide range of load condi-
tions. An internal 0.5A MOSFET reduces external com-
ponent 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 com-
ponent size in low-current applications.
o Up to 500kHz Switching Frequency
o Selectable Inductor Current Limit
(125mA, 250mA, or 500mA)
o 18µA Operating Supply Current
o 0.1µA Shutdown Current
o Avaiable in Two Small Packages
6-Pin TDFN
Additional features include a low quiescent supply cur-
rent and a shutdown mode to save power. The
MAX1605 is ideal for small LCD panels with low current
requirements, but can also be used in other applica-
tions. A MAX1605EVKIT evaluation kit (EV kit) is avail-
able to help speed up design time.
6-Pin SOT23
Applications
Ordering Information
LCD Bias Generators
Cellular/Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
TEMP
PIN-
SOT
PART
RANGE
PACKAGE
MARK
6 SOT23-6
6 TDFN
AAHP
ABW
MAX1605EUT-T -40°C to +85°C
MAX1605ETT-T -40°C to +85°C
Handy Terminals
Typical Operating Circuit
Pin Configuration
L1
10µH
TOP VIEW
V
V
= 0.8V TO V
OUT
IN
SHDN
1
2
3
6
5
4
FB
SHDN
FB
1
2
3
6
5
4
V
= V TO 30V
IN
OUT
= 2.4V TO 5.5V
CC
V
CC
LX
V
LIM
V
LIM
LX
CC
CC
MAX1605
MAX1605
MAX1605
GND
LX
GND
LIM
FB
SOT23
TDFN
3mm ✕ 3mm
ON
SHDN
GND
OFF
________________________________________________________________ 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.