MAX1553:High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs

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

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.

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
Integrated 1-cell Li+ chargers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs | Typical Operating Circuit
Integrated 1-cell Li+ chargers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs | Typical Operating Circuit
  • Cell Phones
  • Color Display Backlight
  • PDA, Palmtop, and Wireless Handhelds
titleDownload file
MAX1553-MAX1554 Data SheetMAX1553-MAX1554.pdf
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
MAX15531-Cell Li+Inductor Based61Series0.021010Analog
2000.$1.25 @1k
MAX1554100.80.65TDFN-EP/8$1.35 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX1561:High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
  • MAX1848:White LED Step-Up Converter in SOT23
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1553ETA+ActiveTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CLead Free
MAX1553ETA+TActiveTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CLead Free
MAX1553ETA-TNo Longer AvailableMAX1553ETA+TTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CNo
MAX1553-MAX1554.pdf MAX1554
MAX1553-MAX1554_cn.pdf MAX1554
Reduce the Chances of Human Error: Part 2, Super Amps and Filters for Analog Interface MAX5492
MAX1553.pdf MAX1553