PDF LM49270 Data sheet ( Hoja de datos )

Número de pieza	LM49270
Descripción	Filterless 2.2W Stereo Class D Audio Subsystem
Fabricantes	National Semiconductor
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No Preview Available ! December 2006 LM49270 Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense General Description The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo head- phone amplifier, volume control, headphone sense, and National’s unique 3D sound enhancement into a single de- vice. The LM49270 uses flexible I2C control interface for multiple application requirements. The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features National’s Output Capaci- tor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers. The IC features a headphone sense input (HPS) that auto- matically detects the presence of a headphone and config- ures the device accordingly. The LM49270 can automatically switch from OCL headphone output to a line driver output. If the VOC pin is pulled to GND, the VOC amplifier is disabled and the VOC pin is internally set to GND. This feature allows the LM49270 to be used as a line driver in OCL mode without a GND conflict on the headphone jack sleeve. Additionally, the headphone amplifier can be configured as capacitively coupled (CC). The LM49270 features a 32 step volume control for the head- phone and stereo outputs. The device mode select and vol- ume are controlled through an I2C compatible interface. Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Su- perior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49270 is available in a space saving 28-pin, 5x5mm LLP package. Key Specifications ■ Stereo Class D Amplifier Efficiency: VDD = 3.3V, 450mW/Ch into 8Ω VDD = 5V, 1W/Ch into 8Ω ■ Quiescent Power Supply Current, VDD = 3.3V Speaker Mode Headphone Mode (OCL) ■ Power Output/Channel, VDD = 5V Class D Speaker amplifier: RL = 4Ω, THD+N = ≤ 10% RL = 8Ω, THD+N = ≤ 1% Headphone amplifier: RL = 16Ω, THD+N = ≤ 1% RL = 32Ω, THD+N = ≤ 1% ■ Shutdown current 84% 84% 5.5mA 4mA 2.2W 1.06W 155mW 90mW 0.02μA Features ■ Stereo filterless Class D amplifier ■ Selectable OCL/CC headphone amplifier ■ Headphone sense ability ■ National’s 3D Enhancement ■ RF suppression ■ I2C control interface ■ 32-step digital volume control ■ 6 Operating Modes ■ Output short circuit protection and thermal shutdown protection ■ Minimum external components ■ Click and Pop suppression ■ Micro-power shutdown ■ Independent speaker and headphone volume controls ■ Available in space-saving 28 pin LLP package Applications ■ Portable DVD players ■ Smart phones ■ PDAs ■ Laptops Boomer® is a registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation 202129 www.national.com 1 page Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Thermal Resistance θJA Operating Ratings (Notes 1, 2) 35.1°C/W Supply Voltage (Note 1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility(Note 4) ESD Susceptibility (Note 5) Junction Temperature (TJMAX) 6.0V −65°C to +150°C –0.3V to VDD +0.3V Internally Limited 2000V 200V 150°C Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage (VDD, LSVDD, HPVDD) I2C Voltage (I2CVDD) −40°C ≤ TA ≤ 85°C 2.4V ≤ VDD ≤ 5.5V 2.4V ≤ I2CVDD ≤ 5.5V Electrical Characteristics VDD = 3.3V (Notes 1, 2) The following specifications apply for Headphone: AV = 0dB, RL(HP) = 32Ω; for Loudspeakers: AV = 6dB, RL(SP) = 15μH + 8Ω + 15μH , f = 1kHz, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM49270 Typical Limit (Note 6) (Notes 7, 8) Units (Limits) IDD Supply Current VIN = 0, RL = No Load, Both channels active Speaker ON, HP OFF Speaker OFF, CC HP ON Speaker OFF, OCL HP ON 5.5 7.6 mA (max) 3 4.7 mA (max) 4 5.75 mA (max) ISD Shutdown Supply Current VOS Output Offset Voltage Headphone Speaker 0.02 2 μA (max) 10 25 mV (max) 10 60 mV (max) Speaker Mode, f = 1kHz THD+N = 1% RL = 4Ω RL = 8Ω THD+N = 10% RL = 4Ω RL = 8Ω CC Headphone Mode, f = 1kHz 700 450 870 560 mW 400 mW (min) mW mW POUT Output Power THD+N = 1% RL = 16Ω RL = 32Ω THD+N = 10% RL = 16Ω RL = 32Ω OCL Headphone Mode, f = 1kHz 60 36 74 55 mW 30 mW (min) mW mW THD+N = 1% RL = 16Ω RL = 32Ω THD+N = 10% RL = 16Ω RL = 32Ω 60 mW 36 30 mW (min) 73 mW 55 mW 5 www.national.com 5 Page THD+N vs Frequency OCL Headphone Mode VDD = 3.3V, POUT = 25mW, RL = 32Ω THD+N vs Frequency OCL Headphone Mode VDD = 5V, POUT = 70mW, RL = 32Ω 20212912 THD+N vs Frequency CC Headphone Mode VDD = 3.3V, POUT = 45mW, RL = 16Ω 20212913 THD+N vs Frequency CC Headphone Mode VDD = 5V, POUT = 100mW, RL = 16Ω 20212916 THD+N vs Frequency CC Headphone Mode VDD = 3.3V, POUT = 25mW, RL = 32Ω 20212917 THD+N vs Frequency CC Headphone Mode VDD = 5V, POUT = 70mW, RL = 32Ω 20212918 11 20212919 www.national.com 11 Page

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