LM49251

ACTIVE

Stereo Audio Subsystem w/ Class G Headphone Amp & Class D Speaker Amp w/ Speaker Protection

Top

Product details

Parameters

Audio input type Analog Input Architecture Class-D Speaker channels (Max) Stereo Power stage supply (Max) (V) 5.5 Power stage supply (Min) (V) 2.7 Load (Min) (ohms) 4 Output power (W) 1.37 SNR (dB) 98 THD + N @ 1 kHz (%) 0.02 Iq (Typ) (mA) 1.15 Control interface I2C Closed/open loop Open Analog supply (Min) (V) 2.7 Analog supply (Max) (V) 5.5 PSRR (dB) 93 Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

DSBGA (YZR) 30 8 mm² 2.557 x 3.021 open-in-new Find other Speaker amps

Features

  • Class G Ground Referenced Headphone Outputs
  • E2S Class D Amplifier
  • No Clip Function
  • Power Limiter Speaker Protection
  • I2C Volume and Mode Control
  • Advanced Click-and-Pop Suppression
  • Micro-Power Shutdown

Key Specifications

  • Class G Headphone Amplifier, HPVDD = 1.8V, RL = 32Ω
    • IDDQHP: 1.15 mA (Typ)
    • Output Power, THD+N ≤ 1%: 20 mW (Typ)
  • Stereo Class D Speaker Amplifier RL = 8Ω
    • Output Power, THD+N ≤ 1%, LSVDD = 5.0V: 1.37 W (Typ)
    • Output Power, THD+N ≤ 1%, LSVDD = 3.6V: 680 mW (Typ)
    • Efficiency: 90% (Typ)

All trademarks are the property of their respective owners.

open-in-new Find other Speaker amps

Description

The LM49251 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI’s PowerWise family of products, the LM49251 utilizes a high efficiency class G headphone amplifier topology as well as a high efficiency class D loudspeaker.

The headphone amplifiers feature TI’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The stereo class D speaker amplifier provides both a no-clip feature and speaker protection. The Enhanced Emission Suppression (E2S) outputs feature a patented, ultra low EMI PWM architecture that significantly reduces RF emissions.

The LM49251 features separate volume controls for the mono and stereo inputs. Mode selection, shutdown control, and volume are controlled through an I2C compatible interface.

Click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49251 is available in an ultra-small 30-bump DSBGA package (2.55mmx3.02mm)

open-in-new Find other Speaker amps
Download

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 1
Type Title Date
* Datasheet Stereo Audio w/Class G Headphone Amp & Class D Speaker Amp w/Speaker Protection datasheet (Rev. A) Apr. 06, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

CALCULATION TOOLS Download
Coefficient Calculator For Digital Biquad Filters
COEFFICIENT-CALC COEFFICIENT-CALC (TIBQ) calculates the coefficients for the digital filter biquad transfer function implemented in TI audio codecs. The characteristics of the digital filter are adjusted by selecting a filter type and moving a control point within a window that shows the transfer function gain and (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 30 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Related videos