MAX158 - Maxim

MAX158 High-Efficiency / 26V Step-Up Converter

The MAX1582 drives up to six white LEDs in series with a constant current to provide display backlighting for two (main and sub-) displays in cell phones and other hand-held devices. This configuration eliminates the need for ballast resistors and expensive factory calibration. The proprietary dual-output, step-up pulse-width modulation (PWM) converter inclu.

Features

o Accurate Current Regulation for Uniform Illumination o Lights Up Two LED Sections for Main and Subdisplays o Up to 84% Efficiency o Internal High-Power, 30V MOSFET o Low 15mVP-P Input Ripple o Flexible Dimming Control Analog DAC Controlled Direct-Digital PWM (No RC Required) from 200Hz to 200kHz o Overvoltage Protection to Eliminate Zener Diode o Constant 1MHz PWM Operation o Low-Profile Inductor and Capacitors o Soft-Start Eliminates Inrush Current o 2.6V to 5.5V Input o 0.01µA (typ) Shutdown Current o Tiny UCSP (2.1mm ✕ 2.1mm ✕ 0.61mm) and Thin QFN (4mm ✕ 4mm) Packages MAX1582 Applicatio.