LM48560 - High Voltage Class H Ceramic Speaker Driver with Automatic Level Control

The LM48560 device is a high voltage, high efficiency, Class H driver for ceramic speakers and piezo actuators. The LM48560 device’s Class H architecture offers significant power savings compared to traditional Class AB amplifiers. The device provides 30 V_P–P output drive while consuming just 4 mA of quiescent current from a 3.6 V supply.

The LM48560 device features TI’s unique automatic level control (ALC) that provides output limiter functionality. The LM48560 device features two fully differential inputs with separate gain settings, and a selectable control interface. In software control mode, the gain control and device modes are configured through the I²C interface. In hardware control mode, the gain and input mux are configured through a pair of logic inputs.

The LM48560 device has a low power shutdown mode that reduces quiescent current consumption to 0.1 µA. The LM48560 device is available in an ultra-small 16-bump DSBGA package (1.97 mm × 1.97 mm).

• Class H Topology
• Integrated Boost Converter
• Bridge-Tied Load (BTL) Output
• Selectable Differential Inputs
• Selectable Control Interfaces
  • (Hardware or Software mode)
• I²C Programmable ALC
• Low Supply Current
• Minimum External Components
• Micro-Power Shutdown
• Available in Space-Saving DSBGA Package
• Key Specifications:
  • Output Voltage at V_DD = 3.6 V,
    R_L = 1.5 µF + 10 Ω, THD+N ≤ 1%
    • 30 V_P-P (Typical)
  • Quiescent Power Supply Current
    at 3.6 V (ALC Enabled)
    • 4 mA (Typical)
  • Power Dissipation at 25 V_P–P, 1 W (Typical)
  • Shutdown Current, 0.1 µA (Typical)