MAX1698 Maxim, MAX1698 Datasheet
MAX1698
Manufacturer Part Number
MAX1698
Description
High-Efficiency Step-Up Current Regulator for LEDs
Manufacturer
Maxim
Datasheet
1.MAX1698.pdf
(8 pages)
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The MAX1698 is the most efficient driver for white or
color LEDs. The device is ideal for LED backlit displays
in PDAs and digital cameras, and can also be used for
larger displays like those in laptop computers. Its
numerous benefits include greater simplicity, lower
cost, higher efficiency, longer bulb life, and greater reli-
ability when compared to fluorescent (CCFL) and elec-
troluminescent (EL) lamps.
The MAX1698 is a switch-mode boost controller in
which LED current, rather than output voltage, provides
the feedback signal. It can operate with battery inputs
as low as 0.8V. The device drives series-connected
LEDs with a controlled current that is measured at a
sense resistor connected at the feedback pin. The
required sense resistor is typically 15Ω, not an expen-
sive fractional-ohm value. LED current control and dim-
ming are accomplished with an adjust input (ADJ), not
with lossy current-limiting resistors. For larger light out-
put, multiple LED banks can be connected in parallel
with up to 5W total output power.
The MAX1698 is supplied in a space-saving 10-pin
µMAX package that occupies half the space of an 8-pin
SO. An evaluation kit (MAX1698EVKIT) is available to
speed designs.
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.
19-1621; Rev 0; 1/00
Battery-Powered Backlight Applications
Backlight for LCD Panels
Cell Phones
Handy Terminals
PDAs
OFF
V
________________________________________________________________ Maxim Integrated Products
BATT
V
CC
ON
General Description
V
SHDN
REF
ADJ
GND
CC
MAX1698
L
Applications
PGND
EXT
CS
FB
Current Regulator for LEDs
D1
High-Efficiency Step-Up
o Over 90% Efficiency
o Lossless, Adjustable LED Brightness
o Space-Saving 10-Pin µMAX Package
o Simpler, Lower Cost, More Reliable Compared
o Up to 5W Output Power
to CCFL or EL Backlights
MAX1698EUB
PART
R
FB
TOP VIEW
I
LED
SHDN
GND
ADJ
Typical Operating Circuit
V
REF
CC
1
2
3
4
5
R
TEMP. RANGE
-40°C to +85°C
N
Ordering Information
MAX1698
µMAX
Pin Configuration
C
10
OUT
9
8
7
6
V
EXT
CS
PGND
GND
FB
OUT
PIN-PACKAGE
10 µMAX
Features
1
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