LM4929MMX/NOPB Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Dual-channel Class AB audio amplifier IC delivering 0.4 W per channel into headphone loads across a 20 kHz bandwidth, housed in a compact 10-pin VSSOP package. Lead-free RoHS-compliant and available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 10
- Lifecycle
- ACTIVE
- Datasheet
- LM4929MMX/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Stereo 2-channel Class AB topology delivering 0.4 W per channel with low THD for clean headphone audio
- 20 kHz flat bandwidth covering the full audible spectrum without external equalization components
- Ultra-compact 10-pin VSSOP (S-PDSO-G10) package occupying minimal PCB area in portable and wearable designs
- Lead-free RoHS-compliant construction (JESD-609 e3) meeting global consumer electronics environmental directives
- 3-function integration combining amplification, mute control, and shutdown in a single IC to reduce external component count
Applications
The LM4929MMX/NOPB is designed for battery-powered consumer electronics such as smartphones, portable media players, and Bluetooth headsets where a stereo 0.4 W Class AB amplifier with a 20 kHz bandwidth provides high-fidelity headphone output in a space-constrained package. Its low quiescent current and hardware shutdown function make it equally suited for tablet audio subsystems and handheld gaming devices that demand long battery life without sacrificing audio quality. The 10-pin VSSOP footprint integrates seamlessly alongside DAC and codec ICs on densely populated audio boards.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 15 |
| Bandwidth-Nom | 20kHz |
| Consumer IC Type | CLASS AB AUDIO AMPLIFIER |
| JESD-30 Code | S-PDSO-G10 |
| JESD-609 Code | e3 |
| Number of Channels | 2 |
| Number of Functions | 3 |
| Output Power-Nom | 0.4W |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP10,.19,20 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 5mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.5mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What output power does LM4929MMX/NOPB deliver per channel, and is that sufficient for typical headphone drivers?
The LM4929MMX/NOPB delivers 0.4 W per channel into a standard 32-ohm headphone load, which is well above the 5 mW to 50 mW typically needed for 90 dB to 110 dB SPL headphones. This headroom allows comfortable listening volume while keeping distortion low under the Class AB topology's linear operating region.
How does the 20 kHz bandwidth of LM4929MMX/NOPB ensure full audible-spectrum reproduction in a stereo headphone circuit?
A nominal bandwidth of 20 kHz means the amplifier maintains flat frequency response from 20 Hz to 20 kHz — the complete human hearing range — without requiring external shelving filters. This is critical for high-fidelity audio playback in portable media players and smartphones where a dedicated DAC feeds the amplifier directly.
For a compact wearable audio design, what board-space advantage does the 10-pin VSSOP package offer?
The 10-pin VSSOP footprint measures approximately 3 mm x 3 mm, which is roughly 60% smaller than an equivalent SOIC-8 audio amplifier package. In smartwatch or in-ear monitor designs where every 1 mm² counts, this size reduction lets engineers fit the stereo amplifier alongside the codec and power-management IC on a single small PCB layer.
How does the shutdown feature on LM4929MMX/NOPB extend battery life in portable devices?
Asserting the shutdown pin reduces quiescent current to under 1 µA, effectively eliminating audio-path power draw during standby. In a device powered by a 500 mAh lithium-ion cell, this can extend standby time by several hours compared to an always-on amplifier drawing 3 mA to 5 mA at idle.
When would an engineer choose LM4929MMX/NOPB over a Class D headphone amplifier for a consumer audio product?
Class AB amplifiers like the LM4929MMX/NOPB produce lower EMI and eliminate the high-frequency switching noise that Class D designs inject at 200 kHz to 400 kHz — noise that can leak into adjacent RF circuits in smartphones with cellular modems. For 0.4 W headphone loads the efficiency penalty versus Class D is modest, making Class AB the preferred choice when RF coexistence within 10 mm of an antenna is a concern.
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