The LM9022 is a National Semiconductor product that is a vacuum fluorescent display filament driver. It is capable of delivering 2 watts of continuous average power into a 10 ohm filament load when powered by a 5V power supply. The LM9022's micropower shutdown mode (IQ = 0.6µA, typical) is activated when VDD is applied to the SHUTDOWN pin, which can be used to conserve power in portable applications. Additional LM9022 features include thermal shutdown protection, unity-gain stability, and external gain set.
The LM9022 is a bridged power amplifier designed to drive vacuum fluorescent display (VFD) filaments. It delivers up to 2 W of continuous average power into a 10 Ω filament load from a 5 V supply and includes features such as thermal shutdown, micropower shutdown mode, and external gain setting.
The document provides key electrical characteristics, absolute maximum ratings, typical application circuits, and mechanical dimensions for MSOP, Small‑Outline, and DIP packages. It also outlines recommended bypass and shutdown pin usage for low‑noise operation and power‑saving in portable applications.
| Output Voltage across 10 Ω load (typ) | 3.6 V |
|---|---|
| Thermal Resistance (SO package) | 140 °C/W |
| Supply Voltage Range | -0.3 V to +6.0 V |
| Operating Temperature Range | -65 °C to +150 °C |
| Package Types | MSOP, Small‑Outline, DIP |
The LM9022 is offered in MSOP, Small‑Outline, and DIP packages.