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Texas Instruments LM48511SQBD/NOPB
- Part No.:
- LM48511SQBD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Audio Amplifier Evaluation Boards
- Package:
- Datasheet:
-
LM48511SQBD/NOPB.pdf
- Description:
- EVAL BOARD FOR LM48511
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
LM48511SQBD/NOPB from Texas Instruments is a mono, filterless Class D audio power amplifier with integrated current-mode boost converter, delivering 3W into 8Ω at 5V supply, <1% THD+N at 1–2.5W (3–4V), and operating across –40°C to +85°C for portable audio systems.
For engineers reviewing the LM48511SQBD/NOPB datasheet, LM48511SQBD/NOPB pinout, LM48511SQBD/NOPB application, or LM48511SQBD/NOPB equivalent, key selection criteria include its spread-spectrum modulation for EMI reduction, dual-feedback PV1 voltage selection (4.8V/7.6V), differential input architecture, independent shutdown controls, and ultra-low pop/click suppression during power transitions.
Technical Context
The LM48511SQBD/NOPB integrates a fixed-frequency 1MHz current-mode boost regulator with a low-noise PWM Class D amplifier. Its selectable feedback network (via FB_SEL) enables dynamic PV1 output switching between ~4.8V and ~7.6V, optimizing efficiency across battery voltage and output power demands.
It supports two modulation modes-Fixed Frequency (FF) and Spread Spectrum (SS)-with SS mode suppressing RF emissions to eliminate external LC filters. The amplifier uses differential inputs (IN+, IN−), features independent SD_Amp and SD_Boost controls, and includes thermal/short-circuit protection plus soft-start circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 3W continuous into 8Ω @ 5V VDD; 1–2.5W @ 3–4V with <1% THD+N - enables high-fidelity mono audio in space-constrained portable devices. |
| THD+N | <1% @ 1kHz, 1–2.5W, 8Ω - ensures clean audio reproduction without audible distortion in consumer playback applications. |
| Supply Range (VDD) | 3.0V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V) and regulated 5V rails in GPS, MP3 players, and mobile handsets. |
| Boost Output (PV1) | Selectable 4.8V or 7.6V via FB_SEL - matches amplifier headroom needs to battery voltage, improving system efficiency by up to 15% vs fixed-boost designs. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade portable electronics requiring reliable operation across environmental extremes. |
| PSRR | –70dB @ 217Hz (typical) - rejects power supply ripple and noise, reducing need for additional input filtering in noisy battery-powered systems. |
| Efficiency | 80% @ 5V, 3W into 8Ω - extends battery runtime significantly over Class AB alternatives in always-on or burst-play audio use cases. |
Pinout & Package
The LM48511SQBD/NOPB is housed in a 24-pin WQFN package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad (EP) for enhanced power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− | Differential audio input | Accepts balanced analog signal; rejects common-mode noise and improves PSRR without requiring DC-blocking capacitors. |
| VGO+, VGO− | Class D output terminals | Drive speaker directly (filterless); support 8Ω loads; require no external LC output filter due to low-noise PWM architecture. |
| FB_SEL | Feedback select control | Logic-level input selecting PV1 output: Low → ~4.8V, High → ~7.6V; enables adaptive boost voltage scaling. |
| /SD_Amp | Amplifier shutdown | Active-low enable; disables Class D stage only while preserving boost regulator state for fast wake-up. |
| /SD_Boost | Boost regulator shutdown | Active-low enable; powers down entire boost stage to minimize quiescent current when high output power is not needed. |
| SS_EN | Spread spectrum enable | High = Spread Spectrum mode (reduced EMI); Low = Fixed Frequency mode (predictable switching noise). |
| GND1, GND2, GND3 | Separate ground domains | GND1 (device AGND), GND2 (quiet signal GND), GND3 (switching node GND) - isolation prevents noise coupling and ensures stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Filterless Class D topology | Eliminates external LC output filter, saving >15mm² PCB area and reducing BOM cost by two inductors and two capacitors. |
| Spread spectrum modulation | Reduces peak EMI by >10dB across 30–100MHz band, enabling compliance with FCC Part 15 Class B without shielding or layout rework. |
| Dual PV1 feedback selection | Optimizes boost voltage per load condition: lower PV1 at low output power cuts switching losses, extending battery life by up to 22%. |
| Independent shutdown controls | Allows granular power management: disable amplifier only (retain boosted rail) or disable both stages for deep sleep (<1μA total IQ). |
| Click-and-pop suppression | Hardware-based soft-start and controlled turn-on/turn-off sequencing eliminates audible transients during power-up/down in user-facing audio products. |
Applications
| GPS Navigation Units | Portable Media Players |
|---|---|
|
Use Scenario: Audio alerts and voice guidance in handheld GPS units powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Mono audio power amplifier with integrated boost converter providing regulated high-voltage rail for loudspeaker drive. Use Value: Delivers 2.5W into 8Ω at 3.6V input with <1% THD+N and 78% efficiency, ensuring clear voice output even at low battery voltage. |
Use Scenario: Embedded speaker playback in flash-based MP3 players with tight board space and strict EMI limits. IC Role / Device Role / Timing Role: Filterless Class D amplifier eliminating external output filter components while meeting CISPR-22 radiated emissions requirements. Use Value: Spread spectrum mode reduces peak RF emissions by >10dB, allowing pass/fail certification without added shielding or ferrite beads. |
| Smartphone Secondary Audio | Bluetooth Speaker Modules |
|
Use Scenario: Auxiliary mono speaker driver for notification sounds and voice assistant responses in smartphones with limited internal volume. IC Role / Device Role / Timing Role: Low-noise differential-input amplifier with independent SD_Amp control for rapid mute/unmute during call transitions. Use Value: Superior click-and-pop suppression ensures zero audible artifacts during simultaneous Bluetooth audio routing and UI sound generation. |
Use Scenario: Compact, battery-powered Bluetooth speaker using single 3.7V cell and 8Ω full-range driver. IC Role / Device Role / Timing Role: Integrated boost + Class D solution delivering 3W output with adaptive PV1 scaling as battery discharges from 4.2V to 3.0V. Use Value: Dual feedback selection maintains consistent output power and THD+N across full battery range, avoiding volume drop or distortion at end-of-life. |
Availability
LM48511SQBD/NOPB is available at Aetrix Electronics and suitable for GPS navigation units, portable media players, smartphone secondary audio subsystems, and Bluetooth speaker modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM48511SQBD/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and consumer markets.
The LM48511SQBD/NOPB belongs to TI's audio power amplifier product line, designed specifically for ultra-low-EMI, battery-efficient mono audio in space- and power-constrained portable electronics.
FAQ
What is the maximum continuous output power of the LM48511SQBD/NOPB into an 8Ω load?
The LM48511SQBD/NOPB delivers 3W continuous output power into an 8Ω load when operating from a 5V supply. At lower supply voltages (3–4V), it provides 1–2.5W with less than 1% THD+N. This performance is verified under thermal conditions specified in the official TI datasheet and confirmed on the LM48511 evaluation board with proper PCB layout and heatsinking.
Does the LM48511SQBD/NOPB require an external LC output filter?
No, the LM48511SQBD/NOPB does not require an external LC output filter due to its low-noise PWM architecture and selectable spread-spectrum modulation. This filterless operation is validated across all operating conditions in the TI AN-1922 evaluation report and reduces component count, PCB area, and system cost without compromising audio quality or EMI compliance.
How does the FB_SEL pin affect the LM48511SQBD/NOPB's boost output voltage?
The FB_SEL pin selects between two feedback networks: logic Low sets PV1 to ~4.8V (VFB × [1 + 25.5kΩ/9.31kΩ]), and logic High sets PV1 to ~7.6V (VFB × [1 + 25.5kΩ/4.87kΩ]), where VFB = 1.23V. This allows dynamic optimization of the boost rail to match instantaneous output power demand, improving overall system efficiency in battery-powered applications.
What are the thermal and short-circuit protections built into the LM48511SQBD/NOPB?
The LM48511SQBD/NOPB includes internal thermal shutdown that activates above +150°C junction temperature and output short-circuit protection that disables the Class D stage upon detection of sustained overload. These protections are hardware-implemented and do not require external components, ensuring robust fault handling in real-world portable device deployments.
Can the LM48511SQBD/NOPB operate from a 3.0V supply, and what output power is achievable?
Yes, the LM48511SQBD/NOPB operates from 3.0V to 5.5V. At 3.0V supply, it delivers up to 1.5W into 8Ω with less than 1% THD+N when configured with appropriate feedback and output settings. Performance data is documented in TI's AN-1922 test reports, including THD+N vs. output power curves at 3V, 3.6V, and 5V.
LM48511SQBD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Boomer®
- Packaging:
- Box
- Product Status:
- Active
- Amplifier Type:
- Class D
- Output Type:
- 1-Channel (Mono)
- Max Output Power x Channels @ Load:
- 6.7W x 1 @ 4Ohm
- Voltage - Supply:
- 3V ~ 5.5V
- Utilized IC / Part:
- LM48511
- Contents:
- Board(s)
LM48511SQBD/NOPB FAQ
1.How can I place an order for LM48511SQBD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM48511SQBD/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM48511SQBD/NOPB reliable?
The price and inventory of LM48511SQBD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM48511SQBD/NOPB is usually 5 days.
3.What payment methods are accepted for LM48511SQBD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM48511SQBD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM48511SQBD/NOPB?
LM48511SQBD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM48511SQBD/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM48511SQBD/NOPB?
For technical support, including LM48511SQBD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM48511SQBD/NOPB requirements.
6.How does Aetrix verify that LM48511SQBD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM48511SQBD/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM48511SQBD/NOPB meets industry standards.
7.What is the process for return or replacement of LM48511SQBD/NOPB?
All LM48511SQBD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM48511SQBD/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM48511SQBD/NOPB part is unused and in its original packaging.
Return procedure for LM48511SQBD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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