Document
LM4866 2.2W Stereo Audio Amplifier
October 2002
LM4866 2.2W Stereo Audio Amplifier
General Description
The LM4866 is a bridge-connected (BTL) stereo audio power amplifier which, when connected to a 5V supply, delivers 2.2W to a 4Ω load (Note 1) or 2.5W to a 3Ω load (Note 2) with less than 1.0% THD+N. With the LM4866 packaged in the LLP, the customer benefits include low thermal impedance, low profile, and small size. This package minimizes PCB area and maximizes output power. The LM4866 features an externally controlled, low-power consumption shutdown mode, and thermal shutdown protection. It also utilizes circuitry to reduce “clicks and pops” during device turn-on. Boomer audio power amplifiers are designed specifically to use few external components and provide high quality output power in a surface mount package.
Note 1: An LM4866MTE or LM4866LQ that has been properly mounted to a circuit board will deliver 2.2W into 4Ω. The other package options for the LM4866 will deliver 1.1W into 8Ω. See the Application Information sections for further information concerning the LM4866MTE and LM4866LQ. Note 2: An LM4866MTE or LM4866LQ that has been properly mounted to a circuit board will deliver 2.5W into 3Ω.
Key Specifications
n PO at 1% THD+N n LM4866LQ, 3Ω, 4Ω loads n LM4866MTE, 3Ω, 4Ω loads n LM4866MTE, 8Ω load n LM4866MT, 8Ω load n Shutdown current n Supply voltage range 2.5W(typ), 2.2W(typ) 2.5W(typ), 2.2W(typ) 1.1W(typ) 1.1W(typ) 0.7µA(typ) 2.0V to 5.5V
Features
n n n n n Stereo BTL amplifier mode “Click and pop” suppression circuitry Unity-gain stable Thermal shutdown protection circuitry TSSOP and Exposed-DAP LLP packages
Applications
n Multimedia monitors n Portable and desktop computers n Portable televisions
Typical Application
20018601
Note: Pin out shown for LLP package. Refer to the Connection Diagrams for the pinout of the TSSOP package.
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© 2002 National Semiconductor Corporation
DS200186
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LM4866
Connection Diagrams
20018629
Top View Order Number LM4866MT See NS Package Number MTC20 for TSSOP
20018630
Top View Order Number LM4866LQ See NS Package Number LQA24A for Exposed-DAP LLP
20018643
Top View Order Number LM4866MTE See NS Package Number MXA20A for Exposed-DAP TSSOP
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LM4866
Absolute Maximum Ratings
(Note 3)
Thermal Resistance θJC (typ) — MTC20 θJA (typ) — MTC20 θJC (typ) — LQ24A θJA (typ) — LQ24A θJC (typ) — MXA20A θJA (typ) — MXA20A θJA (typ) — MXA20A θJA (typ) — MXA20A 20˚C/W 80˚C/W 3.0˚C/W 42˚C/W (Note 7) 2˚C/W 41˚C/W (Note 8) 51˚C/W (Note 9) 90˚C/W (Note 10)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 4) ESD Susceptibility(Note 5) ESD Susceptibility (Note 6) Junction Temperature Solder Information Small Outline Package Vapor Phase (60 sec.) Infrared (15 sec.) 215˚C 220˚C 6.0V −65˚C to +150˚C −0.3V to VDD +0.3V Internally limited 2000V 200V 150˚C
Operating Ratings
Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage −40˚C ≤ TA ≤ 85˚C 2.0V ≤ VDD ≤ 5.5V
See AN-450 “Surface Mounting and their Effects on Product Reliablilty” for other methods of soldering surface mount devices.
Electrical Characteristics for Entire IC (Notes 3, 11)
The following specifications apply for VDD = 5V unless otherwise noted. Limits apply for TA = 25˚C. Symbol Parameter Conditions LM4866 Typical (Note 12) VDD IDD ISD Supply Voltage Quiescent Power Supply Current Shutdown Current VIN = 0V, IO = 0A (Note 14) VDD applied to the SHUTDOWN pin 11.5 0.7 Limit (Note 13) 2 5.5 20 6 2 V (min) V (max) mA (max) mA (min) µA (min) Units (Limits)
Electrical Characteristics for Bridged-Mode Operation (Notes 3, 11) The following specifications apply for VDD = 5V unless otherwise specified. Limits apply for TA = 25˚C.
Symbol Parameter Conditions LM4866 Typical (Note 12) VOS PO Output Offset Voltage Output Power (Note 15) VIN = 0V THD+N = 1%, f = 1kHz (Note 16) LM4866MTE, RL = 3Ω LM4866LQ, RL = 3Ω LM4866MTE, RL = 4Ω LM4866LQ, RL = 4Ω LM4866MT, RL = 8Ω THD+N = 10%, f = 1kHz LM4866MTE, RL = 3Ω LM4866LQ, RL = 3Ω LM4866MTE, RL = 4Ω LM4866LQ, RL = 4Ω LM4866MT, RL = 8Ω 3.2 3.2 2.7 2.7 1.5 W W W W W 5 2.5 2.5 2.2 2.2 1.1 1.0 Limit (Note 13) 50 mV (max) W W W W W (min) Units (Limits)
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LM4866
Electrical Characteristics for Bridged-Mode Operation (Notes 3, 11)
The following specifications apply for VDD = 5V unless otherwise specified. Limits apply for TA = 25˚C. Symbol Parameter Conditions LM4866 Typical (Note 12) THD+N Total Harmonic Distortion+Noise 20Hz ≤ f ≤ 20kHz, AVD = 2 LM4866MTE, RL = 4Ω, PO = 2W LM4866LQ, RL = 4Ω, PO = 2W LM4866MT, RL = 4Ω, PO = 1W LM4866MT, RL = 8Ω, PO = 1W PSRR XTALK SNR Power Supply Rejection Ratio Channel Separation Signal To Noise Ratio VDD = 5V, VRIPPLE = 200mVRMS, RL = 8Ω, CB =.