MAX98502：Boosted 2.2W Class D Amplifier with Automatic Level Control

Delivers Constant 2.2W Output Power Without Collapsing Battery

The MAX98502 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 (2.2µH) external inductor and capacitor. 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 amplifier has differential inputs and an internal fully differential design. The MAX98502 also features three gain settings (6dB, 15.5dB, and 20dB) that are selectable with a logic input. The MAX98502 is available in a small, 0.5mm pitch 16-bump WLP package (2.1mm x 2.1mm). It is specified over the extended -40°C to +85°C temperature range.

Key Features

Boosted Class D Output
Integrated Automatic Level Control
Output Power
- 2.2W into 8Ω, 10% THD+N
- 1.7W into 8Ω, 1% THD+N
- 4.1W into 4Ω, 10% THD+N
- 3.4W into 4Ω, 1% THD+N
Wide 2.5V to 5.5V Supply Voltage Range
Undervoltage Lockout Protection
High Total Efficiency of 87%
High Step-Up Switching Frequency (2MHz)
Active Emission Limiting for Low EMI

MAX98502: Simplified Block Diagram

Applications/Uses

Active Speaker Accessories
Cell Phones
GPS Devices
Mobile Internet Devices
Smartphones

DataSheet

title	Download file
MAX98502 Data Sheet	MAX98502.pdf

Parametrics

Part Number	Class	Spkr. Amp. V_CC (V)	Spkr. Amp. V_CC (V)	Spkr. Amp. I_CC (mA)	P_OUT into 4Ω @ 1% THD+N (W)	P_OUT into 4Ω @ 10% THD+N (W)	P_OUT into 8Ω @ 1% THD+N (W)	P_OUT into 8Ω @ 10% THD+N (W)	Spkr. Amp. Half Pwr. THD+N (%)	SNR (dB)	PSRR (dB)	Package/Pins	Budgetary Price
Part Number	Class	min	max	typ	min	min	min	min	Spkr. Amp. Half Pwr. THD+N (%)	A- Weighted	min	Package/Pins	See Notes
MAX98502	D	2.5	5.5	3.7	3.4	4.1	1.7	2.2	0.04	102	95	WLP/16	$0.71 @1k