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MAX17105

Maxim
Part Number MAX17105
Manufacturer Maxim
Description 8-String WLED Driver
Published Oct 30, 2014
Detailed Description 19-4562; Rev 1; 12/09 TION KIT EVALUA BLE AVAILA 8-String WLED Driver with Integrated Step-Up Regulator and SMBus/PWM ...
Datasheet PDF File MAX17105 PDF File

MAX17105
MAX17105

Overview
19-4562; Rev 1; 12/09 TION KIT EVALUA BLE AVAILA 8-String WLED Driver with Integrated Step-Up Regulator and SMBus/PWM Dimming Capability General Description The MAX17105 is a high-efficiency driver for white-lightemitting diodes (WLEDs).
It is designed for large liquidcrystal displays (LCDs) that employ an array of LEDs as the light source.
An internal switch-current mode step-up controller drives the LED array, which can be configured for up to 8 strings in parallel and 10 LEDs per string.
Each string is terminated with ballast that achieves Q2% current regulation accuracy, ensuring even LED brightness.
The MAX17105 has a wide input voltage range from 6V to 28V, and provides adjustable 0 to 30mA fullscale LED current.
The MAX17105 can internally generate a digitally adjusted pulse-width modulation (DPWM) signal for accurate WLED dimming control.
The DPWM frequency is resistor programmable, while DPWM duty cycle is controlled directly from an external PWM signal or through a control word through the MAX17105’s SMBus™ interface.
This DPWM control provides a dimming range with 8-bit resolution and supports Intel display power-saving technology (DPST) to maximize battery life.
The MAX17105 also has direct PWM control mode, in which the PWMI directly controls the LED current turn on/off and the SMBus interface is disabled.
The MAX17105 has multiple features to protect the controller from fault conditions.
Separate feedback loops limit the output voltage under any circumstance, ensuring safe operation.
Once an open string is detected, the string is disabled while other strings operate normally.
The MAX17105 also features short LED detection.
The shorted strings are also disabled.
The controller features cycle-by-cycle current limit to provide constant operation and soft-start capability.
If the MAX17105 is in currentlimit condition, the step-up regulator is latched off after an internal timer expires.
A thermal-shutdown circuit provides another level of protection.
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