MAX8901B Ver la hoja de datos (PDF) - Maxim Integrated

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MAX8901B

Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package

Maxim Integrated 

MAX8901A/MAX8901B

Highest Efficiency Supply

for 2 to 6 Series WLEDs in a

2mm x 2mm TDFN Package

MAX8901A

THERMAL

SHUTDOWN

INTERNAL

750kHz OSC

SHUTDOWN

TIMER

REF

BOOST

CONTROL

LOGIC

GND

IC

IN

POWER

LX

PGND

OVP

Gm

D*0.5V

EP

CS

PWM

COMP

ON

Figure 2. MAX8901A Block Diagram

Detailed Description

The high efficiency and tiny size of the MAX8901A/

MAX8901B WLED step-up converters make them ideally

suited for driving LCD backlighting in cell phones, PDAs,

and other portable and handheld devices. The

MAX8901_ drive from 2 to 6 series-connected WLEDs

with constant current for uniform WLED intensity and are

optimized for the highest possible efficiency (up to 91%)

over the full 1-cell Li+/Li-Poly battery range. These tiny

2mm x 2mm devices operate at a constant 750kHz

switching frequency, and use small external components

to achieve minimal input and output ripple while occupy-

ing the smallest possible footprint.

These converters use a single input (ON) to enable the IC

and to control WLED intensity. The MAX8901A requires a

direct PWM input to modulate WLED intensity, with WLED

current proportional to the PWM duty cycle. The

MAX8901B uses single-wire, serial-pulse dimming that

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