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High-Efficiency Step-Up Current Regulator for LEDs

Product Details

Key Features

Parametric specs for LED Drivers
VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 50
# LED Channels 4
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.35
Dimming Ratio (max) 20
Dimming Control Analog
VCURR_SENSE (mV) 300
POUT (W) 5
ICC (mA) (max) 0.5
LED String Volt. (V) (max) 60
Switching Frequency (kHz) 300
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.67
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 50
# LED Channels 4
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.35
Dimming Ratio (max) 20
Dimming Control Analog
VCURR_SENSE (mV) 300
POUT (W) 5
ICC (mA) (max) 0.5
LED String Volt. (V) (max) 60
Switching Frequency (kHz) 300
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.67

Key Features

  • Over 90% Efficiency
  • Lossless, Adjustable LED Brightness
  • Space-Saving 10-Pin µMAX Package
  • Simpler, Lower Cost, More Reliable Compared to CCFL or EL Backlights
  • Up to 5W Output Power

Applications/Uses

  • Backlight for LCD Panels
  • Battery-Powered Backlight Applications
  • Cell Phones
  • Handy Terminals
  • PDAs

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 electroluminescent (EL) lamps.

The MAX1698/MAX1698A are switch-mode boost controllers 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 typically 15Ω sense resistor, not an expensive fractional-ohm value. LED current control and dimming are accomplished with an adjust input (ADJ). For larger light output, multiple LED banks can be connected in parallel with up to 5W total output power.

The MAX1698A has a higher, and more accurately specified, CS current limit than the MAX1698 for higherpower 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.

Simplified Block Diagram

MAX1698, MAX1698A: Typical Operating Circuit MAX1698, MAX1698A: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.