LM49251TL/NOPBIn StockTexas Instruments
LM49251TL/NOPB is a stereo headphone amp with I2C volume control and DirectPath cap-free output, DSBGA-25. From $2.04 at 10K+pcs. In stock, ships globally.
- Manufacturer
- Texas Instruments
- Package
- DSBGA-25
- Pin Count
- 25
- Lifecycle
- ACTIVE
- Datasheet
- LM49251TL/NOPB Datasheet PDF
- Category
- amplifiers
- Price
- From $1.1900(MOQ 500)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Stereo headphone amplifier with DirectPath output — no coupling caps
- I2C-programmable 32-step volume control
- Ground-referenced output eliminates large DC blocking capacitors
- Low THD+N: 0.01% at 1kHz into 32Ω
- Ultra-compact DSBGA-25 (2.5mm x 2.5mm)
Applications
Designed for smartphone, tablet, and portable media player headphone outputs. Also used in portable DACs, wireless earbuds charging cases with audio passthrough, and compact audio test equipment.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Channel Separation | 84dB |
| Consumer IC Type | VOLUME CONTROL CIRCUIT |
| JESD-30 Code | R-PBGA-B30 |
| JESD-609 Code | e1 |
| Noise Figure-Nom | 98dB |
| Number of Channels | 2 |
| Number of Functions | 3 |
| Output Power-Nom | 1.37W |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | BGA30,5X6,20 |
| Package Shape | RECTANGULAR |
| Package Style | GRID ARRAY, VERY THIN PROFILE, FINE PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 6.8mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Surface Mount | YES |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Tin/Silver/Copper (Sn/Ag/Cu) |
| Terminal Form | BALL |
| Terminal Pitch | 0.5mm |
| Terminal Position | BOTTOM |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | DSBGA-25 |
Compliance & Regulatory
| RoHS Status | Compliant |
| 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 is DirectPath technology?
DirectPath eliminates the need for large DC-blocking output capacitors by using an internal charge pump to generate a negative supply rail. This enables ground-referenced output that drives headphones without coupling capacitors, saving PCB space and improving bass response.
How is volume controlled on LM49251?
The LM49251 includes a 32-step digital volume control accessible via I2C bus. Volume range is 0dB to -42dB in steps, plus mute. The I2C address is configurable. Volume changes include built-in soft-stepping to prevent audible clicks.
What headphone impedance does LM49251 drive?
LM49251 drives headphones from 16Ω to 600Ω. At 32Ω (typical), it delivers 30mW per channel at 0.01% THD+N. At 16Ω, output power increases to 50mW. High-impedance headphones (300-600Ω) work well with reduced power.
What is the power supply requirement?
LM49251 operates from 2.7V to 5.5V single supply. It internally generates the negative rail for DirectPath operation. Typical supply current is 3.5mA in playback. Shutdown mode reduces current to <1µA for battery conservation.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 500+ | $1.3400 | $670.00 |
| 1000+ | $1.2700 | $1270.00 |
| 10000+ | $1.1900 | $11900.00 |
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