High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs

Smallest, Highest Efficiency, 40V Driver for Up to 10 White LEDs

Please check latest availability status for a specific part variant.


The MAX1553/MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held devices. The step-up converter includes an internal 40V, low RDSON, N-channel MOSFET switch for high efficiency and maximum battery life. The MAX1553 has a current limit of 480mA for driving two to six white LEDs, while the MAX1554 has a current limit of 970mA for driving up to 10 white LEDs.

A single analog/PWM Dual Mode™ input provides two simple means of brightness adjustment. A separate enable input provides on/off control. Soft-start minimizes inrush current during startup.

The MAX1553/MAX1554 are available in space-saving 8-pin TDFN 3mm x 3mm packages.
MAX1553, MAX1554: Typical Operating Circuit Integrated 1-cell Li+ chargers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs | Typical Operating Circuit Enlarge+

Key Features

  • Highly Integrated and Flexible Solution for Wide Range of Backlighting Applications
    • Constant-Current Regulation for Even LED Illumination
    • Internal 40V MOSFET Switch Capable of Driving 10 LEDs
    • 2.7V to 5.5V Input Voltage Range
    • Analog or PWM Control of LED Intensity
    • Optimized for Low Input Ripple
  • Soft-Start Minimizes Inrush Current
  • High Efficiency Improves Battery Life
    • Up to 88% Efficiency Driving 6 LEDs
    • Up to 82% Efficiency Driving 9 LEDs (20mA, VCC = 3.6V)
  • Tiny 8-Pin, 3mm x 3mm TDFN Package Saves Space
    • Small, Low-Profile External Components


  • Cell Phones
  • Color Display Backlight
  • PDA, Palmtop, and Wireless Handhelds
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
PWM Dimming Freq.
Dimming RatioDimming ControlVCURR_SENSE
LED String Volt.
Oper. Freq.
maxmaxmaxminmaxmaxmaxSee Notes
MAX1553 1-Cell Li+Inductor Based61Series0.021010
$1.31 @1k
MAX1554 100.80.65
$1.42 @1k
See All LED Drivers (79)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX1553EVKIT: MAX1553 Evaluation Kit
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Type ID Title
Evaluation Board4042MAX1553EVKIT MAX1553 Evaluation Kit