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Part Name(s) : LA4820M SANYO
SANYO -> Panasonic
Description : Monaural Speaker/STEREO HEADPHONE POWER AMPLIFIER View

Overview
The LA4820M compound POWER IC is designed FOR portable inFORmation processing equipment, such as electronic book players and personal notebook computers, and provides on chip HEADPHONE STEREO AMPLIFIER and monaural speaker AMPLIFIER functions required of such devices. This system IC also provides on chip a POWER-saving HEADPHONE jack plug-in/out detection function, which automatically switches the AMPLIFIERs, and an optimum volume level controller.

Features
POWER-saving HEADPHONE jack plug-in/out detection function on chip that electronically switches between the STEREO HEADPHONE AMPLIFIER and the monaural BTL AMPLIFIER according to jack plug-in/out.
• The monaural AMPLIFIER has, as output control functions, a built-in output limiter that permits adjustment in accordance with the speaker impedance and a non-clipping circuit that outputs a sine wave suited to the output D range, while the HEADPHONE AMPLIFIER has a built-in user-friendly PVSS (Peak Volume Select System).
• On-chip ripple filter with a high ripple rejection ratio in
order to reduce POWER line noise.
• Less external components needed thanks to system and circuit technology, and low-capacitance design (22 µF or less) allowing support FOR chip components.

Functions
• Monaural BTL POWER AMPLIFIER
HEADPHONE OCL POWER AMPLIFIER (16 Ω) × 2
• Output control functions: HEADPHONE POWER PVSS Monaural POWER Non-clipping circuit and output limiter
HEADPHONE jack plug-in/out detection function (monaural AMPLIFIER/HEADPHONE AMPLIFIER switching)
• Ripple filter
POWER mute switch
• Common AMPLIFIER on/off switching

Part Name(s) : LA4801V LA4801 SANYO
SANYO -> Panasonic
Description : HEADPHONE STEREO POWER AMPLIFIER View

Overview
The LA4801V is a HEADPHONE STEREO POWER AMPLIFIER FOR portable CD and MD players. It features a high signal-to-noise ratio, a high ripple rejection ratio, low distortion, and low current drain.

Features
• High signal-to-noise ratio (96 dB typical at 7 µV)
• High ripple rejection ratio (76 dB typical)
• Low current drain (4.8 mA typical)
• Low POWER consumption achieved through the use of a dual POWER supply system.
• No electrolytic capacitors required FOR the outputs.
• Ultraminiature package (SSOP-16)

Functions
HEADPHONE STEREO POWER AMPLIFIER
POWER switch
• Muting switch
• Center AMPLIFIER switch

Part Name(s) : LA4800V LA4800 SANYO
SANYO -> Panasonic
Description : 3 V STEREO HEADPHONE POWER AMPLIFIER View

Overview
The LA4800V is a HEADPHONE STEREO POWER AMPLIFIER IC that features a high signal-to-noise ratio, high ripple rejection, low distortion and low current consumption, making it ideal FOR portable CD players.

Features
• 96 dB (typ) high S/N ratio at 7 µV
• 76 dB (typ) high ripple rejection
• 0.07% (typ) low distortion with RL = 16 Ω
• 6.2 mA (typ) low current consumption
• Outputs do not require electrolytic capacitors.
• Available in 16-pin SSOPs

Functions
HEADPHONE STEREO POWER AMPLIFIER
• Beep tone
POWER switch
POWER mute switch

Part Name(s) : LM4949 LM4949TL National-Semiconductor
National ->Texas Instruments
Description : Boomer STEREO Class D Audio Subsystem with OCL HEADPHONE AMPLIFIER View

General Description
The LM4949 is a fully integrated audio subsystem designed FOR STEREO cell phone applications. The LM4949 combines a 2.5W STEREO Class D AMPLIFIER plus a separate 190mW STEREO HEADPHONE AMPLIFIER, volume control, and input mixer into a single device. The filterless class D AMPLIFIERs deliver 1.19W/
channel into an 8Ωload with <1% THD+N from a 5V supply.

Features
Output Short Circuit Protection
Thermal Shutdown
STEREO filterless Class D operation
Selectable OCL/CC HEADPHONE Drivers
RF Suppression
I2C Control Interface
32-step digital volume control
Independent Speaker and HEADPHONE Gain Settings
Minimum external components
Click and Pop suppression
Micro-POWER shutdown
Available in space-saving 25 bump µSMD package

Applications
Mobile phones
PDAs
Laptops


Part Name(s) : LM4681 LM4681SQ National-Semiconductor
National ->Texas Instruments
Description : 10 Watt STEREO CLASS D Audio POWER AMPLIFIER with STEREO HEADPHONE AMPLIFIER and I2C/SPI Volume Control View

General Description
The LM4681 is a fully integrated single supply, CLASS D audio POWER AMPLIFIER solution. The LM4681 utilizes a proprietary balanced pulse-width modulation technique that lowers output noise and THD and improves PSRR when compared to conventional pulse width modulators.

Features
■ Pulse-width modulator.
■ I2C/SPI (selectable) volume control
STEREO HEADPHONE AMPLIFIER.
■ “Click and pop” suppression circuitry.
■ MicroPOWER shutdown mode.
■ 48 lead LLP package (No heatsink required).

Applications
■ Flat Panel Displays
■ Televisions
■ Multimedia Monitors

Part Name(s) : LM4682 LM4682SQ National-Semiconductor
National ->Texas Instruments
Description : 10 Watt STEREO CLASS D Audio POWER AMPLIFIER with STEREO HEADPHONE AMPLIFIER and DC Volume Control View

General Description
The LM4682 is a fully integrated single supply, high efficiency audio POWER AMPLIFIER solution. The LM4682 utilizes a proprietary balanced pulse-width modulation technique that lowers output noise and THD and improves PSRR when compared to conventional pulse width modulators.
   
Features
■ Pulse-width modulator.
■ DC Volume Control
STEREO HEADPHONE AMPLIFIER.
■ “Click and pop” suppression circuitry.
■ MicroPOWER shutdown mode.
■ 48 lead LLP package (No heatsink required).
   
Applications
■ Flat Panel Displays
■ Televisions
■ Multimedia Monitors
   

Part Name(s) : MAX9779 MAX9779ETI+ MAX9779ETI MaximIC
Maxim Integrated
Description : 2.6W STEREO Audio POWER AMPLIFIER and DirectDrive HEADPHONE AMPLIFIER View

General Description
The MAX9779 combines a STEREO, 2.6W audio POWER AMPLIFIER and STEREO DirectDrive™ 110mW HEADPHONE AMPLIFIER in a single device. The HEADPHONE AMPLIFIER uses Maxim’s patented DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need FOR large DC-blocking capacitors, saving cost, space, and component height. A high 90dB PSRR and low 0.01% THD+N ensures clean, low-distortion amplification of the audio signal through the Class AB speaker AMPLIFIERs.

Features
♦ No DC-Blocking Capacitors Required—Provides Industry’s Most Compact Notebook Audio Solution
♦ PC2001 Compliant
♦ 5V Single-Supply Operation
♦ Class AB 2.6W STEREO BTL Speaker AMPLIFIERs
♦ 110mW DirectDrive HEADPHONE AMPLIFIERs
♦ High 90dB PSRR
♦ Low-POWER Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Low 0.01% THD+N at 1kHz
♦ Short-Circuit and Thermal-Overload Protection
♦ Selectable Gain Settings (15dB, 16.5dB, 18dB, and 19.5dB)
♦ ±8kV ESD-Protected HEADPHONE Driver Outputs
♦ Available in Space-Saving, Thermally Efficient Package
    28-Pin Thin QFN (5mm x 5mm x 0.8mm)

Applications
    Notebook PCs
    Flat-Panel TVs
    Tablet PCs
    Multimedia Monitors
    Portable DVD Players
    LCD Projectors

Part Name(s) : TP5218 TP5218N TP5218A Ceramate
CERAMATE TECHNICAL
Description : STEREO HEADPHONE AMPLIFIER View

DESCRIPTION
The TP5218 is Class AB STEREO HEADPHONE AMPLIFIER, , It have SOP8 and DIP8 package. The chip is high perFORmance design by 0.5μ m CMOS process and low pin count low cost device, Otherwise, the TP5218 have high impedance AMPLIFIER and have low noise design.

FEATURES
◇ Low POWER consumption
◇ High slew rate
◇ Low distortion
◇ Large output swing
◇ Low standby current
◇ Excellent POWER supply ripple rejection
◇ Wide temperature operation
◇ No switch ON/OFF click noise

Applications
HEADPHONE drive
◇ CD_ROM STEREO driver
◇ MP3 walkman audio driver
◇ Portable audio
◇ Hi-Fi audio system

Part Name(s) : LM4863G-D16-T LM4863G-N20-R LM4863G-S18-R UTC
Unisonic Technologies
Description : DUAL 2.2W AUDIO AMPLIFIER PLUS STEREO HEADPHONE FUNCTION View

■ DESCRIPTION
The UTC LM4863 is a dual bridge-connected audio POWER AMPLIFIER. It combines dual bridge speaker AMPLIFIERs and STEREO HEADPHONE AMPLIFIERs on one chip to simplify audio system design. In addition, the HEADPHONE input pin allows the AMPLIFIERs to operate in single-ended mode when driving STEREO HEADPHONEs.
The IC could deliver different POWER by packages as below (when connected to a 5V supply with less than 1.0% THD+N.):

   - HTSSOP-20, 4Ω load: 2.2W
   - HTSSOP-20, 3Ω load: 2.5W(with FORced-air cooled)
   - SOP/DIP , 8Ω load: 1.1W.

The UTC LM4863 features an externally controlled, low-POWER consumption shutdown mode, a STEREO HEADPHONE AMPLIFIER mode, and thermal shutdown protection. It also utilizes circuitry to reduce “clicks and pops” during device turn-on.

■ FEATURES
* “Click and pop” suppression circuitry
* Thermal shutdown protection circuitry
* Unity-gain stable
* STEREO HEADPHONE AMPLIFIER mode

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