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

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

Product Details

Key Features

Parametric specs for LED Drivers
VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series
ILED per Channel (A) (max) 0.02
PWM Dimming Freq. (kHz) (max) 10
Dimming Ratio (max) 10
Dimming Control Analog
PWM
VCURR_SENSE (mV) 200
POUT (W) 0.5
ICC (mA) (max) 0.35
LED String Volt. (V) (max) 40
Switching Frequency (kHz) 250
Package/Pins TDFN/8
Budgetary
Price (See Notes)
1.39
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Simplified Block Diagram

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 2.7
VIN (V) (max) 5.5
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series
ILED per Channel (A) (max) 0.02
PWM Dimming Freq. (kHz) (max) 10
Dimming Ratio (max) 10
Dimming Control Analog
PWM
VCURR_SENSE (mV) 200
POUT (W) 0.5
ICC (mA) (max) 0.35
LED String Volt. (V) (max) 40
Switching Frequency (kHz) 250
Package/Pins TDFN/8
Budgetary
Price (See Notes)
1.39

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

Applications/Uses

  • Cell Phones
  • Color Display Backlight
  • PDA, Palmtop, and Wireless Handhelds

Description

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.

Simplified Block Diagram

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 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 .