Datasheet MAX1698, MAX1698A (Maxim)
| Manufacturer | Maxim |
| Description | High-Efficiency Step-Up Current Regulator for LEDs |
| Pages / Page | 8 / 1 — High-Efficiency Step-Up. Current Regulator for LEDs. MAX1698/MAX1698A. … |
| File Format / Size | PDF / 172 Kb |
| Document Language | English |
High-Efficiency Step-Up. Current Regulator for LEDs. MAX1698/MAX1698A. General Description. Features. Over 90% Efficiency
Model Line for this Datasheet
Text Version of Document
19-1621; Rev 2; 2/07
High-Efficiency Step-Up Current Regulator for LEDs MAX1698/MAX1698A General Description Features
The MAX1698 and MAX1698A are efficient drivers for ♦
Over 90% Efficiency
white or color LEDs. They are ideal for large LED backlit displays in PDAs and laptop computers. Numerous ♦
Lossless, Adjustable LED Brightness
benefits include greater simplicity, lower cost, higher ♦
Space-Saving 10-Pin µMAX Package
efficiency, longer bulb life, and greater reliability when compared to fluorescent (CCFL) and electrolumines- ♦
Simpler, Lower Cost, More Reliable Compared
cent (EL) lamps.
to CCFL or EL Backlights
The MAX1698/MAX1698A are switch-mode boost con- ♦
Up to 5W Output Power
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-
Ordering Information
ly 15Ω sense resistor, not an expensive fractional-ohm
PIN - PKG
value. LED current control and dimming are accom-
PART T EM P RA N G E PA C K A G E CODE
plished with an adjust input (ADJ). For larger light out- put, multiple LED banks can be connected in parallel
MAX1698
EUB -40°C to +85°C 10µMAX U10-2 with up to 5W total output power.
MAX1698A
EUB -40°C to +85°C 10µMAX U10-2 The MAX1698A has a higher, and more accurately specified, CS current limit than the MAX1698 for higher-
Pin Configuration
power applications of 5W or more. Both devices are supplied in a space-saving 10-pin µMAX package that TOP VIEW occupies half the space of an 8-pin SO. An evaluation kit (MAX1698EVKIT) is available to speed designs. VCC 1 10 EXT
Applications
SHDN 2 9 CS MAX1698 Battery-Powered Backlight Applications REF 3 8 PGND MAX1698A Backlight for LCD Panels ADJ 4 7 GND Notebook PCs GND 5 6 FB Handy Terminals µ
MAX
PDAs
Typical Operating Circuit
L V D1 BATT VOUT COUT VCC VCC EXT MAX1698 ON MAX1698A OFF SHDN CS ILED REF PGND ADJ FB GND RFB RN
________________________________________________________________ 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.
High-Efficiency Step-Up Current Regulator for LEDs MAX1698/MAX1698A General Description Features
The MAX1698 and MAX1698A are efficient drivers for ♦
Over 90% Efficiency
white or color LEDs. They are ideal for large LED backlit displays in PDAs and laptop computers. Numerous ♦
Lossless, Adjustable LED Brightness
benefits include greater simplicity, lower cost, higher ♦
Space-Saving 10-Pin µMAX Package
efficiency, longer bulb life, and greater reliability when compared to fluorescent (CCFL) and electrolumines- ♦
Simpler, Lower Cost, More Reliable Compared
cent (EL) lamps.
to CCFL or EL Backlights
The MAX1698/MAX1698A are switch-mode boost con- ♦
Up to 5W Output Power
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-
Ordering Information
ly 15Ω sense resistor, not an expensive fractional-ohm
PIN - PKG
value. LED current control and dimming are accom-
PART T EM P RA N G E PA C K A G E CODE
plished with an adjust input (ADJ). For larger light out- put, multiple LED banks can be connected in parallel
MAX1698
EUB -40°C to +85°C 10µMAX U10-2 with up to 5W total output power.
MAX1698A
EUB -40°C to +85°C 10µMAX U10-2 The MAX1698A has a higher, and more accurately specified, CS current limit than the MAX1698 for higher-
Pin Configuration
power applications of 5W or more. Both devices are supplied in a space-saving 10-pin µMAX package that TOP VIEW occupies half the space of an 8-pin SO. An evaluation kit (MAX1698EVKIT) is available to speed designs. VCC 1 10 EXT
Applications
SHDN 2 9 CS MAX1698 Battery-Powered Backlight Applications REF 3 8 PGND MAX1698A Backlight for LCD Panels ADJ 4 7 GND Notebook PCs GND 5 6 FB Handy Terminals µ
MAX
PDAs
Typical Operating Circuit
L V D1 BATT VOUT COUT VCC VCC EXT MAX1698 ON MAX1698A OFF SHDN CS ILED REF PGND ADJ FB GND RFB RN
________________________________________________________________ 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.
