MAX8901: the most efficient 2 to 6 series WLED power supplies

Crystal plug-in 2*6 206 2.0*6.0MM 24.576MHZ

MOS power IC full range

Probe domestic high frequency needle JKT-50L high frequency needle with 3 probes

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)