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Texas Instruments LM4951ASDBD/NOPB
- Part No.:
- LM4951ASDBD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Audio Amplifier Evaluation Boards
- Package:
- Datasheet:
-
LM4951ASDBD/NOPB.pdf
- Description:
- EVAL BOARD FOR LM4951A
- Quantity:
- Payment:
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Product details
Overview
LM4951ASDBD/NOPB from Texas Instruments is a mono bridge-tied-load (BTL) audio power amplifier delivering 1.8 W into 8 Ω at 7.5 V with <1% THD+N, featuring active-low shutdown, thermal/short-circuit protection, and pop/click suppression. It operates across 2.7–9 V supply range and targets space-constrained portable audio systems.
For engineers reviewing the LM4951ASDBD/NOPB datasheet, LM4951ASDBD/NOPB pinout, LM4951ASDBD/NOPB application, or LM4951ASDBD/NOPB equivalent, this page provides verified specifications, package details, real-world use cases, and validated alternative options for BTL audio amplifier selection in battery-powered devices.
Technical Context
The LM4951ASDBD/NOPB implements a dual-op-amp BTL architecture: AMPA (inverting input, external gain-setting resistors Ri/Rf) drives VO+, while AMPB (fixed −1 gain, internal 20 kΩ resistors) inverts AMPA's output to drive VO−-producing 180° phase difference for differential speaker drive. Its internal half-supply bias at BYPASS eliminates DC-blocking capacitors.
It integrates controlled CCHG-based input capacitor charging for fast 25 ms wake-up, low-quiescent 2.5 mA operation, and micro-power shutdown drawing only 0.01 µA. Protection includes thermal shutdown (150–190 °C trip), short-circuit detection, and no-bootstrap/no-snubber design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 1.8 W (typ) into 8 Ω BTL @ 7.5 V, 1% THD+N - enables loud, clean mono audio in compact portable speakers |
| Supply Voltage Range | 2.7 V to 9 V - supports single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (3.0–3.6 V), and regulated 5 V/7.5 V rails |
| Quiescent Current | 2.5 mA (typ) @ 7.5 V - minimizes standby power draw in always-on audio subsystems |
| Shutdown Current | 0.01 µA (typ) - extends battery life during device sleep without external power gating |
| THD+N | 0.07% (typ) @ 600 mW, 1 kHz, 6 dB gain - ensures high-fidelity playback with low harmonic distortion |
| PSRR | 66 dB (min) @ 217 Hz - rejects ripple from noisy switch-mode supplies without additional filtering |
| Turn-on Time | 25 ms (typ) with 1.0 µF BYPASS capacitor - balances fast startup against click/pop suppression |
Pinout & Package
LM4951ASDBD/NOPB uses a 10-pin WSON package (DPR0010A), 3 mm × 3 mm, 0.5 mm pitch, with exposed thermal pad (DAP) requiring solder connection to PCB ground plane for thermal performance (θJA = 73 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BYPASS) | ½-VDD reference bypass output | Connects to 1.0 µF tantalum capacitor to stabilize internal bias and improve PSRR; ceramic substitution causes oscillation |
| 2 (SHUTDOWN) | Active-low digital control input | Pull low to enter 0.01 µA shutdown; VIH ≥ 1.2 V, VIL ≤ 0.4 V; internal 75 kΩ pull-down ensures default active state |
| 3 (CCHG) | Analog charge control output | Sources current to rapidly charge input coupling capacitor (Ci); RC = 1 kΩ recommended for overvoltage protection |
| 4, 8 (NC) | No-connect terminals | Not bonded to die; may be left floating or tied to GND; no electrical function |
| 5 (VIN) | Single-ended analog input | Accepts line-level or codec output; high-impedance input sets gain via external Ri/Rf network |
| 6 (VO−) | Inverting amplifier output | Drives speaker negative terminal in BTL configuration; internally biased at VDD/2 |
| 7 (GND) | Power and signal ground reference | Mandatory low-impedance connection to PCB ground plane; ties to exposed DAP for thermal conduction |
| 9 (VDD) | Positive power supply input | Accepts 2.7–9 V; requires local 1.0 µF tantalum + 0.1 µF ceramic bypass to GND near pin |
| 10 (VO+) | Non-inverting amplifier output | Drives speaker positive terminal in BTL configuration; complements VO− for 2× voltage swing |
Key Features
| Feature | Design Value |
|---|---|
| Pop & click suppression | Controlled BYPASS ramp + internal delay prevents audible transients during power-up/shutdown without external circuitry |
| Unity-gain stable | Operates reliably with AV = 1 (Ri = Rf = 20 kΩ) or higher gains up to 26 dB; no external compensation required |
| External gain configuration | Set closed-loop gain from 6 dB to 26 dB using Ri/Rf ratio (AVD = 2×Rf/Ri); supports flexible input sensitivity matching |
| No bootstrap/snubber needed | Eliminates 2–3 external capacitors and resistors typical of Class-AB amplifiers, reducing BOM count and board area |
| Thermal & short-circuit protection | Auto-recovery shutdown at 150–190 °C junction temp and output current limiting prevent latch-up or permanent damage |
Applications
| Portable Media Players | Smartphone Audio Subsystem |
|---|---|
Use Scenario: Driving mono speaker in MP3 player with 3.3 V Li-ion supply and space-limited PCB layout. IC Role / Device Role / Timing Role: Mono BTL audio amplifier providing 280 mW into 8 Ω @ 3.3 V with <0.5% THD+N and 25 ms wake-up. Use Value: Delivers loud, low-distortion audio without output coupling capacitor or heatsink, enabling ultra-thin form factor. |
Use Scenario: Boosting ringer/speaker volume in entry-tier smartphones using shared 4.2 V battery rail. IC Role / Device Role / Timing Role: Low-quiescent (2.5 mA), fast-wake (25 ms) mono amplifier with shutdown control synchronized to baseband processor. Use Value: Enables instant audio response after call connect while minimizing impact on standby battery life. |
| Laptop Internal Speaker | USB-Powered Desktop Speaker |
Use Scenario: Replacing legacy Class-AB amp in 15.6″ laptop with 7.5 V regulated supply and 8 Ω speaker. IC Role / Device Role / Timing Role: 1.8 W BTL amplifier operating at 7.5 V with 66 dB PSRR to reject SMPS noise from CPU VRM. Use Value: Doubles output power vs single-ended amps at same supply, eliminating bulky output caps and improving bass response. |
Use Scenario: Compact 2.0 speaker system powered directly from USB 5 V port driving dual 8 Ω speakers via two LM4951A channels. IC Role / Device Role / Timing Role: Dual-mono BTL driver delivering 600 mW per channel @ 5 V with independent shutdown control. Use Value: Achieves >85 dBA SPL from small enclosures without external regulators or heat sinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mono BTL audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPA2012D2RTJR | 2-channel stereo Class-D, 1.4 W/ch @ 5 V, 8 Ω; integrated boost converter; 2.5 mm × 2.5 mm QFN-16 | Supports true stereo output; requires external boost for >5 V operation; higher efficiency (>85%) but larger footprint | Select when stereo output or higher efficiency at 5 V is required; not drop-in due to different pinout and control interface |
| MAX9718ETA+ | Single-channel Class AB, 1.4 W @ 5 V, 8 Ω; fixed 6 dB gain; 2.1 mm × 2.1 mm TDFN-8; no shutdown pin | Lacks active-low shutdown and external gain adjustment; lower quiescent current (1.8 mA) but no CCHG pop suppression | Select for cost-sensitive mono applications where simplified control and smaller package outweigh gain flexibility and advanced click/pop features |
Compared with TPA2012D2RTJR and MAX9718ETA+, the LM4951ASDBD/NOPB offers unique BTL gain configurability (6–26 dB), best-in-class 0.01 µA shutdown current, and integrated CCHG-based turn-on optimization-making it optimal for battery-constrained mono audio where design flexibility and ultra-low standby power are critical.
Availability
LM4951ASDBD/NOPB is available at Aetrix Electronics and suitable for portable media players, smartphone audio subsystems, laptop internal speakers, and USB-powered desktop speakers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM4951ASDBD/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-performance audio ICs and power-efficient signal chain solutions.
The LM4951A belongs to TI's Boomer™ audio amplifier family, designed specifically for portable and battery-powered applications demanding high output power, low quiescent current, and robust protection-all in minimal external-component configurations.
FAQ
What is the maximum continuous output power of the LM4951ASDBD/NOPB?
The LM4951ASDBD/NOPB delivers 1.8 W (typical) continuous average power into an 8 Ω load in bridge-tied-load configuration when supplied with 7.5 VDC and operating at <1% THD+N. At 3.3 V, output power drops to 280 mW (min) under the same conditions. Power scales approximately with VDD², and thermal limits constrain sustained output at elevated ambient temperatures.
Does the LM4951ASDBD/NOPB require an output coupling capacitor?
No, the LM4951ASDBD/NOPB does not require an output coupling capacitor. Its internal circuitry biases both VO+ and VO− outputs at VDD/2, resulting in zero net DC voltage across the speaker in BTL mode. This eliminates the need for large electrolytic capacitors, reduces cost and board area, and avoids low-frequency response degradation caused by capacitor impedance.
Can the LM4951ASDBD/NOPB be used with a 3.3 V supply?
Yes, the LM4951ASDBD/NOPB is fully specified for operation from 2.7 V to 9 V. At 3.3 V, it delivers 280 mW (min) into 8 Ω with <0.5% THD+N at 1 kHz and maintains 2.5 mA quiescent current. PSRR improves to 71 dB (min), making it well-suited for direct connection to 3.3 V LDOs in portable systems.
What is the purpose of the CCHG pin on the LM4951ASDBD/NOPB?
The CCHG pin on the LM4951ASDBD/NOPB sources controlled current to rapidly charge the input coupling capacitor (Ci) during power-up, reducing turn-on time to 25 ms (typ) and minimizing audible click/pop artifacts. A 1 kΩ resistor (RC) between Ci and CCHG protects against overvoltage; omitting RC is acceptable only if the input signal is disabled during shutdown.
Is the LM4951ASDBD/NOPB pin-compatible with earlier LM4951 variants?
Yes, the LM4951ASDBD/NOPB is a direct replacement for the LM4951SDBD/NOPB and LM4951ASD/NOPB in the same WSON-10 (DPR0010A) package. Electrical specifications-including shutdown behavior, gain configuration, protection thresholds, and timing-are identical. The "A" suffix denotes improved ESD rating and tighter THD+N distribution, with no layout or firmware changes required.
LM4951ASDBD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Boomer®
- Packaging:
- Box
- Product Status:
- Active
- Amplifier Type:
- Class AB
- Output Type:
- 1-Channel (Mono)
- Max Output Power x Channels @ Load:
- 1.8W x 1 @ 8Ohm
- Voltage - Supply:
- 2.7V ~ 9V
- Utilized IC / Part:
- LM4951A
- Contents:
- Board(s)
LM4951ASDBD/NOPB FAQ
1.How can I place an order for LM4951ASDBD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4951ASDBD/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 LM4951ASDBD/NOPB reliable?
The price and inventory of LM4951ASDBD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4951ASDBD/NOPB is usually 5 days.
3.What payment methods are accepted for LM4951ASDBD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4951ASDBD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4951ASDBD/NOPB?
LM4951ASDBD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4951ASDBD/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 LM4951ASDBD/NOPB?
For technical support, including LM4951ASDBD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4951ASDBD/NOPB requirements.
6.How does Aetrix verify that LM4951ASDBD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4951ASDBD/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 LM4951ASDBD/NOPB meets industry standards.
7.What is the process for return or replacement of LM4951ASDBD/NOPB?
All LM4951ASDBD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4951ASDBD/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 LM4951ASDBD/NOPB part is unused and in its original packaging.
Return procedure for LM4951ASDBD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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