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MAX1848

Maxim
Part Number MAX1848
Manufacturer Maxim
Description White LED Step-Up Converter
Published May 6, 2005
Detailed Description 19-2028; Rev 1; 9/02 White LED Step-Up Converter in SOT23 General Description The MAX1848 drives white LEDs with a cons...
Datasheet PDF File MAX1848 PDF File

MAX1848
MAX1848

Overview
19-2028; Rev 1; 9/02 White LED Step-Up Converter in SOT23 General Description The MAX1848 drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices.
The step-up converter topology allows series connection of the white LEDs so that the LED currents are identical for uniform brightness.
This configuration eliminates the need for ballast resistors and expensive factory calibration.
Other benefits include greater simplicity, lower cost, higher efficiency, and greater reliability.
This step-up PWM converter includes an internal, highvoltage, low RDSON N-channel MOSFET switch for high efficiency and maximum battery life.
A single analog voltage Dual Mode™ input provides a simple means of brightness adjustment and on/off control.
Fast 1.
2MHz current-mode PWM control allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery.
Programmable softstart eliminates inrush current during...


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