Overview
The LM48511SQX/NOPB, produced by Texas Instruments, is a 3-W, ultra-low EMI, filterless, mono, Class D audio power amplifier. This device integrates a boost converter with a high-efficiency Class D audio power amplifier, featuring a low-noise PWM architecture that eliminates the need for an output filter. This design reduces external component count, board area consumption, system cost, and simplifies the overall design process. The LM48511 is particularly suited for use in portable devices such as GPS, mobile phones, cameras, and handheld games due to its high efficiency and low power consumption.
Key Specifications
| Parameter | Condition | Typical Value | Unit |
|---|---|---|---|
| Output Power (PO) | VDD = 5 V, RL = 8 Ω, THD+N = 1% | 3 W | W |
| Output Power (PO) | VDD = 3 V, RL = 8 Ω, THD+N = 1% | 1 W | W |
| Output Power (PO) | VDD = 5 V, RL = 4 Ω, THD+N = 1% | 5.4 W | W |
| Efficiency | f = 1 kHz, RL = 8 Ω, PO = 1 W | 80% | % |
| Quiescent Power Supply Current | VDD = 3 V, Fixed Frequency Mode | 9 mA | mA |
| Quiescent Power Supply Current | VDD = 5 V, Fixed Frequency Mode | 13.5 mA | mA |
| Shutdown Current | VDD = 3 V | 0.01 μA | μA |
| Operating Voltage Range | 3 V to 5.5 V | V | |
| Package Type | WQFN (24-pin) | ||
| Body Size | 5.00 mm × 4.00 mm | mm |
Key Features
- Selectable spread spectrum mode to reduce EMI.
- High efficiency of up to 80% at 5 V.
- Independent regulator and amplifier shutdown controls.
- Dynamically selectable regulator output voltages.
- Filterless Class D amplifier with low-noise PWM architecture.
- Low shutdown current.
- Click and pop suppression.
- Output short circuit and thermal overload protection.
- Gain set by external resistors for independent gain control.
Applications
- GPS devices.
- Portable media players.
- Cameras.
- Mobile phones.
- Handheld games.
Q & A
- What is the maximum output power of the LM48511 at 5 V into an 8 Ω load?
The maximum output power is 3 W at 5 V into an 8 Ω load with THD+N = 1%.
- What is the efficiency of the LM48511 at 5 V?
The efficiency is up to 80% at 5 V.
- Does the LM48511 have EMI reduction features?
Yes, it has a selectable spread spectrum mode to reduce EMI.
- What is the typical quiescent power supply current at 3 V?
The typical quiescent power supply current is 9 mA at 3 V.
- What is the shutdown current at 3 V?
The shutdown current is 0.01 μA at 3 V.
- What type of package does the LM48511 come in?
The LM48511 comes in a 24-pin WQFN package.
- What are the dimensions of the WQFN package?
The dimensions are 5.00 mm × 4.00 mm.
- Does the LM48511 have protection against short circuits and thermal overload?
Yes, it has output short circuit and thermal overload protection.
- How is the gain of the LM48511 set?
The gain is set by external resistors, allowing independent gain control from multiple sources.
- What are some common applications of the LM48511?
Common applications include GPS devices, portable media players, cameras, mobile phones, and handheld games.
