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19-1621; Rev 2; 2/07
High-Efficiency Step-Up
Current Regulator for LEDs
General Description
The MAX1698 and MAX1698A are efficient drivers for
white or color LEDs. They are ideal for large LED backlit
displays in PDAs and laptop computers. Numerous
benefits include greater simplicity, lower cost, higher
efficiency, longer bulb life, and greater reliability when
compared to fluorescent (CCFL) and electrolumines-
cent (EL) lamps.
The MAX1698/MAX1698A are switch-mode boost con-
trollers in which LED current, rather than output voltage,
is regulated The devices drive series-connected LEDs
with a controlled current that is measured with a typical-
Features
? Over 90% Efficiency
? Lossless, Adjustable LED Brightness
? Space-Saving 10-Pin μ MAX Package
? Simpler, Lower Cost, More Reliable Compared
to CCFL or EL Backlights
? Up to 5W Output Power
Ordering Information
ly 15 ? sense resistor, not an expensive fractional-ohm
value. LED current control and dimming are accom-
plished with an adjust input (ADJ). For larger light out-
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
put, multiple LED banks can be connected in parallel
with up to 5W total output power.
MAX1698 EUB
MAX1698A EUB
-40°C to +85°C 10μMAX
-40°C to +85°C 10μMAX
U10-2
U10-2
The MAX1698A has a higher, and more accurately
specified, CS current limit than the MAX1698 for higher-
power applications of 5W or more. Both devices are
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.
TOP VIEW
Pin Configuration
Applications
V CC 1
SHDN 2
10 EXT
9 CS
Battery-Powered Backlight Applications
Backlight for LCD Panels
Notebook PCs
REF
ADJ
GND
3
4
5
MAX1698
MAX1698A
8
7
6
PGND
GND
FB
Handy Terminals
μ MAX
PDAs
Typical Operating Circuit
L
V BATT
D1
C OUT
V OUT
V CC
V CC
MAX1698
EXT
OFF
ON
SHDN
MAX1698A
CS
I LED
REF
PGND
ADJ
FB
GND
R FB
R N
________________________________________________________________ Maxim Integrated Products
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.
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MAX1698EUB+ 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX1698EUB+ 制造商:Maxim Integrated Products 功能描述:IC DRIVER LED SMD 1698 MSOP10 制造商:Maxim Integrated Products 功能描述:IC, DRIVER, LED, SMD, 1698, MSOP10
MAX1698EUB+T 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX1698EUB-T 功能描述:LED照明驱动器 Step-Up Current Regulator for LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX1698EVKIT 功能描述:LED照明驱动器 Evaluation Kit for the MAX1698 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16990ATCD/V+T 制造商:Maxim Integrated Products 功能描述:
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