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LM4911, LM4911Q
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SNAS152M – MAY 2004 – REVISED JUNE 2011
LM4911/LM4911Q
Stereo 40mW Low Noise Headphone
Amplifier with Selectable Capacitive Coupled or OCL Output
Check for Samples: LM4911, LM4911Q
FEATURES
1
•2 OCL or Capacitively Coupled Outputs (Patent Pending)
• External Gain-Setting Capability • Available in Space-Saving VSSOP and WSON
Packages • Ultra Low Current Shutdown Mode • Mute Mode Allows Fast Turn-on (1ms) with
Less Than 1mV Change on Outputs • 2V - 5.5V Operation • Ultra Low Noise • LM4911QMM is an Automotive Grade Product
that is AEC-Q100 Grade 2 Qualified.
APPLICATIONS
• Portable CD Players • PDAs • Portable Electronics Devices • Automotive
KEY SPECIFICATIONS
• PSRR at 217Hz and 1kHz 65 dB (typ)
• Output Power at 1kHz with VDD = 2.4V, 1% THD+N into a 16Ω Load 25 mW (typ)
• Output Power at 1kHz with VDD = 3V, 1% THD+N into a 16Ω Load 40 mW (typ)
• Shutdown Current 2.0 µA (max)
• Output Voltage Change on Release from Shutdown VDD = 2.4V, RL = 16Ω (C-Coupled) 1 mV (max)
• Mute Current 100 µA (max)
DESCRIPTION
The LM4911/LM4911Q is an stereo audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16Ω load or 25mW per channel into a 32Ω load at 1% THD+N from a 3V power supply.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4911/LM4911Q does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. In addition, the LM4911/LM4911Q may be configured for either single-ended capacitively coupled outputs or for OCL outputs (patent pending).
Block Diagram
Figure 1. Block Diagram
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2004–2011, Texas Instruments Incorporated
LM4911, LM4911Q
SNAS152M – MAY 2004 – REVISED JUNE 2011
www.ti.com
DESCRIPTION (CONTINUED)
The LM4911/LM4911Q features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1mV voltage change at outputs on release. Additionally, the LM4911/LM4911Q features an internal thermal shutdown protection mechanism.
The LM4911/LM4911Q is unity gain stable and may be configured with external gain-setting resistors.
A Q-grade version is available for automotive applications. It is AEC-Q100 grade 2 qualified and packaged in a 10–pin VSSOP package (LM4911QMM).
Typical Application
Figure 2. Typical Capacitive Coupled Output Configuration Circuit
Figure 3. Typical OCL Output Configuration Circuit
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Connection Diagram
LM4911, LM4911Q
SNAS152M – MAY 2004 – REVISED JUNE 2011
IN A
1
SD
2
MUTE
3
BYPASS
4
IN B
5
10
VDD
9
VoA
8
VoC
7
VoB
6
GND
Figure 4. VSSOP Package (Top View) See Package Number DGS0010A
Figure 5. WSON Package (Top View) See Package Number NGY0010A
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings (1)(2)
Supply Voltage
6.0V
Storage Temperature
−65°C to +150°C
Input Voltage Power Dissipation (3) ESD Susceptibility (4) ESD Susceptibility (5)
-0.3V to VDD + 0.3V Internally Limited 2000V 200V
Junction Temperature
150°C
Thermal Resistance
θJC (VSSOP)
θJA (VSSOP) θJA (WSON) (6) θJA (WSON) (6)
56°C/W 190°C/W
63°C/W 12°C/W
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional but do not ensure specific performance limits.Electrical Characteristics state DC and AC electrical specifications under particular test conditions which ensures specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not ensured for parameters where no limit is given; however, the typical value is a good indication of device performance.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.
(3) The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The max.