Features • Soft-start circuitry eliminates noise during turn-on transition • Low current shutdown mode • Low quiescent current • 6W BTL output, RL = 8 • Short circuit protection • Fixed, internally set gain of 30dB Description The LM4668 is a high efficiency switching audio power amplifier primarily designed for demanding applications in flat panel monitors and TV's. It is capable of delivering 6W to an 8 mono BTL load with less than 1% distortion (THD+N) from a 12VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4668 features a micro-power, active-low shutdown mode, an internal thermal shutdown protection mechanism, and short circuit protection. The LM4668 contains advanced transient ("pop and click") suppression circuitry that eliminates noises that would otherwise occur during turn-on and turn-off transitions. Key Specification Power Output BTL (VDD = 14V, fIN = 1kHz, THD+N = 10%, RL = 8) 10W (typ) Quiescent Power Supply Current 30mA (typ) Efficiency (VDD = 12V, fIN = 1kHz, RL = 8, POUT = 6W) 79% (typ) Shutdown Current 0.15mA (typ) Fixed Gain 30dB (typ) Applications • Flat Panel Monitors • Flat Panel TVs • Computer Sound Cards

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Datasheets

Title		Size	Date	Other Language
	LM4668 Boomer ® Audio Power Amplifier Series 10W High-Efficiency Mono BTL Audio Power Amplifier	472 Kbytes	13-Oct-04

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4668LD	PVIP050	0	9960	0	0	855000	5	242608584
LM4668LDX	PVIP050	0	9960	0	0	855000	5	242608584
LM4668MH	PVIP050	0	9960	0	0	855000	5	242608584
LM4668MHX	PVIP050	0	9960	0	0	855000	5	242608584

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4668LD			30 Nov 2009
LM4668LDX			30 Nov 2009
LM4668MH			30 Nov 2009
LM4668MHX			30 Nov 2009