The MAX9788 features a mono Class G power amplifier with an integrated inverting charge-pump power supply specifically designed to drive the high capacitance of a ceramic loudspeaker. The charge pump can supply greater than 700mA of peak output current at 5.5VDC, guaranteeing an output of 14VP-P. The MAX9788 maximizes battery life by offering high- performance efficiency. Maxim’s proprietary Class G output stage provides efficiency levels greater than Class AB devices without the EMI penalties commonly associated with Class D amplifiers. The MAX9788 is ideally suited to deliver the high out- put-voltage swing required to drive ceramic/piezoelec- tric speakers. The device utilizes fully differential inputs and outputs, comprehensive click-and-pop suppression, shutdown control, and soft-start circuitry. The MAX9788 is fully spec- ified over the -40°C to +85°C extended temperature range and is available in small lead-free 28-pin TQFN (4mm x 4mm) or 20-bump WLP (2mm x 2.5mm) packages.
The MAX9788 is a single‑channel Class G power amplifier with an integrated inverting charge‑pump power supply, specifically designed to drive the high capacitance of ceramic or piezoelectric loudspeakers. It provides a 14 V P‑P voltage swing and can source more than 700 mA of peak current while operating from a 2.7 V to 5.5 V supply.
Key features include click‑and‑pop suppression, shutdown mode with 0.3 µA quiescent current, differential inputs, and two compact lead‑free packages (28‑pin TQFN and 20‑bump WLP). The device operates over –40 °C to +85 °C and is suited for mobile‑phone, handheld, and other space‑constrained applications that require a ceramic speaker driver.
| Peak Output Current | > 700 mA |
|---|---|
| Output Voltage Swing | 14 V P‑P |
| Operating Temperature Range | -40 °C to +85 °C |
| Gain | 4 V/V (12 dB) |
| Power Consumption | ≈ 3 mW (at 2.7 V) |
It can deliver a 14 V P‑P voltage swing.
The charge‑pump can supply greater than 700 mA of peak output current.