MAX97200 Class H DirectDrive Headphone Amplifier

The MAX97200 uses a Dual Mode™ charge pump to generate the supply voltage required by the amplifier. The charge pump can output either ±PVIN/2 or ±PVIN voltages, depending on the output signal amplitude. When the output signal amplitude is low, the supply voltage is ±PVIN/2. When a larger output signal is required, the charge pump switches modes to generate a higher supply voltage, thereby providing more output power to the load.

The second generation of DirectDrive technology offers lower power consumption than the first generation DirectDrive amplifiers. The MAX97200 operates from a regulated 1.8V supply and consumes the same power as a conventional DirectDrive amplifier powered from a 0.9V supply.

Maxim's DirectDrive architecture uses an inverting charge pump to generate a negative supply voltage. The headphone amplifier is powered from both positive and negative supplies. This approach allows the audio output signal to be biased near ground potential, eliminating the need for large DC-blocking capacitors between the amplifier output and the headphone load.

Low output offset voltage provides excellent click-and-pop immunity when entering and exiting shutdown. Very high signal-to-noise ratio supports high-fidelity design of the system.

The MAX97200 is available in a small 12-bump wafer-level package (WLP 1.27mm x 1.65mm) with a tiny 0.4mm bump pitch and operates over the -40°C to +85°C extended temperature range.

Key Features

Second Generation DirectDrive Technology

Dynamic, Class H, Dual-Mode Charge Pump

Low operating voltage, VPVIN = 1.8V

Low Quiescent Current, 1.15mA (Typical) at VPVIN = 1.8V

No need for large output DC blocking capacitors

Industry-leading click and pop suppression

High Fidelity, 105dB SNR (5.6µV Output Noise)

34mW output power into 32Ω load (THD+N is 1%)

45mW output power into 16Ω load (THD+N is 10%)

Small 12-bump, 1.27mm x 1.65mm WLP package (0.4mm ball pitch)