Summary:
The MAX8901 boost converter can drive 2 to 6 series white LEDs (WLEDs) at a fixed current, providing a uniform brightness WLED driver for mobile phones, PDAs, and other handheld devices for LCD backlighting. Operating at a fixed 750kHz (typ) switching frequency, the MAX8901 allows the use of small external components that are optimized to maintain maximum efficiency over the entire voltage range of a 1-cell Li-Ion/Li-Polymer battery.
The MAX8901 features an internal soft-start to eliminate inrush current during startup. It also features input overvoltage protection, WLED overvoltage protection, and shutdown mode. It consumes only 0.01μA (typical) in shutdown mode. There is no WLED current in shutdown mode, and the forward conduction voltage of the WLED is higher than the input voltage. In addition, the devices feature undervoltage lockout (UVLO) and thermal shutdown protection.
Key characteristics
Up to 91% efficiency
2.6V to 5.5V input voltage range
Fixed frequency mode of operation
Capable of driving 2 to 6 series WLEDs, 1.3% LED current accuracy
Flexible dimming control
Direct PWM dimming (MAX8901A)
32-level, single-wire serial dimming (MAX8901B)
Input undervoltage lock
Input overvoltage latch
WLED overvoltage protection (25V typical value)
0.01μA (typ) shutdown current
No WLED current in shutdown mode
Internal soft start and thermal shutdown
Application field
Cellular phone
Digital camera
Display backlight (2 to 6 WLEDs)
MP3 and portable media player
PDA and smart phone
Portable navigation device
Typical working circuit
For more information on related devices, please see: http://
The MAX8901 data sheet can be found in the PDF document (click on the PDF file to download)
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