MAX98500

The MAX98500 also features three gain settings (6dB, 15.5dB, and 20dB)that are selectable with a logic input. It is specified over the extended -40°C to +85°C temperature range. The MAX98500 is available in a small, 0.5mm pitch 16-bump WLP package (2.1mm x 2.1mm). The MAX98500 is a high-efficiency, Class D audio amplifier that features an integrated boost converter to deliver a constant output power over a wide range of battery supply voltages. The boost converter operates at 2MHz, requiring only a small (2.2FH)external inductor and capacitor. The amplifier MAX98500 has differential inputs and an internal fully differential design. The automatic level control has a battery tracking function that reduces the output swing as the supply voltage drops, preventing collapse of battery voltage.

The features of MAX98500 can be summarized as (1)boosted class D output; (2)integrated automatic level control; (3)output power 2.2w into 8i, 10% thd+n / 1.7w into 8i, 1% thd+n; (4)wide 2.5V to 5.5V supply voltage range; (5)undervoltage lockout protection; (6)high total efficiency of 87%; (7)high step-up switching frequency (2MHz); (8)active emission limiting for low EMI.

The absolute maximum ratings of MAX98500 are (1)VBAT to AGND: -0.3V to +6V; (2)VCCOUT to BSTPGND, AGND: -0.3V to +6V; (3)PVDD to SPKPGND: -0.3V to +6V; (4)BSTPGND, SPKPGND to AGND: -0.3V to +0.3V; (5)GAIN to AGND: -0.3V to (VBAT + 0.3V); (6)SDBST, SDSPK to AGND: -0.3V to VBAT; (7)all other pins (excluding LX)to AGND: -0.3V to +6V; (8)current into/out of LX, VCCOUT, BSTPGND: ±3.9A; (9)continuous current into/out of SPK_, PVDD, SPKPGND: ±800mA; (10)continuous input current (all other pins): ±20mA; (11)duration of Short circuit between VCCOUT and BSTPGND: continuous; (12)duration of SPK_ short circuit to PVDD or SPKPGND: continuous; (13)duration of short circuit between SPKP and SPKN: continuous; (14)continuous power dissipation, multilayer board (TA = +70°C)WLP (derate 20.4mW/°C above +70°C): 1.33W / JA: 49°C/W; (15)junction temperature: +150°C; (16)operating temperature range: -40°C to +85°C; (17)storage temperature range: -65°C to +150°C; (18)soldering temperature (reflow): +260°C.