The new MAX8821 module has the functions LED driver (for 6 white LEDs), audio amplifier (2W) and low-drop-out voltage stabilizer (double, low noise). Combinations of this type are suitable, for example, for GPS units, MP3 players and camcorders.

6 LEDs are operated with constant current and can be dimmed individually from 25.6 to 0.1 mA (32 increments). The efficient 2-watt Class-D amplifier uses active emissions limiting (AEL) to reduce interference. Additionally, the combination of fixed frequency mode (FFM) and spread spectrum mode (SSM) types of modulation leads to low radio frequency radiation (EMI).

Two LDO voltage stabilizers provide low-noise output voltages with currents up to 200 mA or 300 mA respectively. Each output voltage can be individually programmed via an FC interface. Both LDOs have a high power supply rejection ratio (PSRR) of 65dB at 1 kHz. The input voltage range of the MAX8821 is 2.7V to 5.5V.

Features at a glance:

• 6 charge pumps for white LEDs
• independent regulation for each LED
• flexibly programmable dimmer (I²C) for each LED
• 2 low-noise low-dropout voltage regulators (LDOs)
• flexibly adjustable output voltages
• Output voltage 200mA and 300mA
• 2W mono audio class D amplifier
• Differential inputs
• Amplification settings 3 dB to +24 dB
  in 3dB increments
• low distortion (0.05% THD + N at 1kHz)
• high power supply rejection ratio
  (65 dB PSRR at 1kHz)
• 45μV RMS output noise, 70dB PSRR
• 85% efficiency factor (RL=8Ω, Pout=600mW)
• low standby current (70 ΅A, typ.)
• TQFN-28 package (4x4 mm)


For you to download the datasheet:

Product Management Team MAXIM:

Achim Dobrunz
Product Manager
Phone: +49 5722 / 203-114
Fax:     +49 5722 / 203-131
Email:  achim_dobrunz@spezial.com

Arne Landsmann
Field Application Engineer
Phone: +49 7961 / 9047-317
Fax:     +49 7961 / 9047-350
Email:  arne_landsmann@spezial.com