LM4665 Series

1.4-W, mono, analog input Class-D audio amp with selectable gain

Catalog

1.4-W, mono, analog input Class-D audio amp with selectable gain

Part	Supplier Device Package	Voltage - Supply [Max]	Voltage - Supply [Min]	Type	Features	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Package / Case	Max Output Power x Channels @ Load	Mounting Type	Package / Case [x]	Package / Case [x]
Texas Instruments LM4665ITL/NOPB	9-DSBGA	3.8 V	2.7 V	Class AB	Depop Differential Inputs Short-Circuit Protection Shutdown	85 °C	-40 °C	1-Channel (Mono)	9-WFBGA DSBGA	1 1.4 W	Surface Mount
Texas Instruments LM4665MM/NOPB	10-VSSOP	5.5 V	2.7 V	Class AB	Depop Differential Inputs Short-Circuit Protection Shutdown	85 °C	-40 °C	1-Channel (Mono)	10-MSOP 10-TFSOP	1 1.4 W	Surface Mount	3 mm	0.118 in

Catalog

1.4-W, mono, analog input Class-D audio amp with selectable gain

Key Features

• No Output Filter Required for Inductive TransducersSelectable Gain of 6dB (2V/V) or 12dB (4V/V)Very Fast Turn On Time: 5ms (typ)User Selectable Shutdown High or Low Logic LevelMinimum External Components"Click and Pop" Suppression CircuitryMicro-Power Shutdown ModeShort Circuit ProtectionDSBGA, WSON, and VSSOP Packages (No Heat Sink Required)Key SpecificationsEfficiency at 100mW into 8Ω Transducer 75%(typ)Efficiency at 400mW into 8Ω Transducer 80%(typ)Total Quiescent Power Supply Current (3V) 3mA(typ)Total Shutdown Power Supply Current (3V) 0.01µA(typ)Single Supply Range (VSSOP & WSON) 2.7V to 5.5VSingle Supply Range (DSBGA) (Note 11) 2.7V to 3.8VAll trademarks are the property of their respective owners.No Output Filter Required for Inductive TransducersSelectable Gain of 6dB (2V/V) or 12dB (4V/V)Very Fast Turn On Time: 5ms (typ)User Selectable Shutdown High or Low Logic LevelMinimum External Components"Click and Pop" Suppression CircuitryMicro-Power Shutdown ModeShort Circuit ProtectionDSBGA, WSON, and VSSOP Packages (No Heat Sink Required)Key SpecificationsEfficiency at 100mW into 8Ω Transducer 75%(typ)Efficiency at 400mW into 8Ω Transducer 80%(typ)Total Quiescent Power Supply Current (3V) 3mA(typ)Total Shutdown Power Supply Current (3V) 0.01µA(typ)Single Supply Range (VSSOP & WSON) 2.7V to 5.5VSingle Supply Range (DSBGA) (Note 11) 2.7V to 3.8VAll trademarks are the property of their respective owners.

Description

The LM4665 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators. The LM4665 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8Ω transducer loads at a continuous average output of 400mW with less than 2%THD+N. The LM4665 has high efficiency with an 8Ω transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 75%, reaching 80% at 400mW output power. The LM4665 features a low-power consumption shutdown mode. Shutdown may be enabled by either a logic high or low depending on the mode selection. Connecting the Shutdown Mode pin to either VDD(high) or GND (low) enables the Shutdown pin to be driven in a likewise manner to activate shutdown. The LM4665 has fixed selectable gain of either 6dB or 12dB. The LM4665 has short circuit protection against a short from the outputs to VDD, GND or across the outputs. The LM4665 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4665 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators. The LM4665 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8Ω transducer loads at a continuous average output of 400mW with less than 2%THD+N. The LM4665 has high efficiency with an 8Ω transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 75%, reaching 80% at 400mW output power. The LM4665 features a low-power consumption shutdown mode. Shutdown may be enabled by either a logic high or low depending on the mode selection. Connecting the Shutdown Mode pin to either VDD(high) or GND (low) enables the Shutdown pin to be driven in a likewise manner to activate shutdown. The LM4665 has fixed selectable gain of either 6dB or 12dB. The LM4665 has short circuit protection against a short from the outputs to VDD, GND or across the outputs.