MAX98400A

The MAX98400A/MAX98400B are available in 36-pin and 24-pin TQFN packages, respectively, and are specified over the -40°C to +85°C temperature range. The MAX98400A delivers 2x20W into 8I loads or 1x40W into a 4I load. The MAX98400B delivers 2x12W into 8I loads. An integrated limiting circuit prevents output clipping distortion, protects small speakers from transient voltages, and reduces power dissipation. The MAX98400A/MAX98400B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. A thermal-foldback feature can be enabled to automatically reduce the output power at above a junction temperature of +120°C. Traditional thermal protection is also available in addition to robust overcurrent protection. Filterless modulation allows the ICs to pass EN55022B EMI limits with 1m cables using only a low-cost ferrite bead and small-value capacitor on each output. Both devices feature eight digitally controlled gain settings. The ICs operate from a single 8V to 28V supply and provide a high 67dB PSRR, eliminating the need for a regulated power supply. They offer up to 90% efficiency from a 12V supply. Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown.

The features of MAX98400A can be summarized as (1)wide 8V to 28V supply voltage range; (2)single-supply operation; (3)low EMI: active emissions limiting; (4)clipping limiter; (5)low quiescent current; (6)thermal foldback; (7)thermal and overcurrent protection.

The absolute maximum ratings of MAX98400A are (1)PVDD to PGND: -0.3V to +30V; (2)Vto GND: -0.3V to +6V; (3)SHDN, MONO to GND: -0.3V to +6V; (4)IN_ to GND: -0.3V to +6V; (5)G1, G2, RELEASE, TEMPLOCK, LIM_TH to GND: -0.3V to (V+ 0.3V); (6)OUT_ to PGND: -0.3V to (VPVDD + 0.3V); (7)PGND to GND: -0.3V to +0.3V; (8)continuous current into OUT_: +2.4A; (9)continuous current into PVDD, PGND: +4.8A; (10)continuous current into all other pins: +10mA; (11)duration of OUT_ short circuit to PVDD or PGND: continuous; (12)duration of short circuit between OUT_+ and OUT_-: continuous; (13)continuous power dissipation (TA = +70°C)36-pin TQFN multilayer board (derate 35.7mW/°C above +70°C): 2857.1mW / JA: 28°C/W / JC: 1°C/W / 24-Pin TQFN multilayer board (derate 27.8mW/°C above +70°C): 35.7mW / JA: 36°C/W / JC: 3°C/W; (14)junction temperature: +150°C; (15)operating temperature range: -40°C to +85°C; (16)storage temperature range: -65°C to +150°C; (17)lead temperature (soldering, 10s): +300°C; (18)soldering temperature (reflow): +260°C.