LM4665
www.ti.com
LM4665
SNAS146E – FEBRUARY 2002 – REVISED MAY 2013
Filterless High Efficiency 1W Switching Audio
Amplifier
Check for Samples: LM4665
FEATURES
DESCRIPTION
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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.
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No Output Filter Required for Inductive
Transducers
Selectable Gain of 6dB (2V/V) or 12dB (4V/V)
Very Fast Turn On Time: 5ms (typ)
User Selectable Shutdown High or Low Logic
Level
Minimum External Components
"Click and Pop" Suppression Circuitry
Micro-Power Shutdown Mode
Short Circuit Protection
DSBGA, WSON, and VSSOP Packages (No
Heat Sink Required)
APPLICATIONS
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Mobile Phones
PDAs
Portable Electronic Devices
KEY SPECIFICATIONS
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Efficiency 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
5.5V
Single Supply Range (DSBGA) (Note 11) 2.7V
to 3.8V
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.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2013, Texas Instruments Incorporated
LM4665
SNAS146E – FEBRUARY 2002 – REVISED MAY 2013
www.ti.com
Typical Application
Figure 1. Typical Audio Amplifier Application Circuit
Connection Diagram
Figure 2. VSSOP Package – Top View
See Package Number DGS
Figure 3. 9 Bump DSBGA Package – Top View
See Package Number YZR0009
Figure 4. WSON Package – Top View
See Package Number NGZ
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM4665
LM4665
www.ti.com
SNAS146E – FEBRUARY 2002 – REVISED MAY 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings (1) (2) (3)
Supply Voltage (1)
6.0V
−65°C to +150°C
Storage Temperature
VDD + 0.3V ≥ V ≥ GND - 0.3V
Voltage at Any Input Pin
(4)
Internally Limited
ESD Susceptibility (5)
2.0kV
ESD Susceptibility (6)
200V
Power Dissipation
Junction Temperature (TJ)
Thermal Resistance
150°C
θJA (VSSOP)
190°C/W
θJC (VSSOP)
56°C/W
θJA (DSBGA)
180°C/W
θJA (WSON) (7)
θJC (WSON) (7)
Soldering Information
(1)
(2)
(3)
(4)
(5)
(6)
(7)
63°C/W
12°C/W
See the AN-1112 Application Report
All voltages are measured with respect to the ground pin, unless otherwise specified.
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication
of device performance.
If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature
TA. The maximum allowable power dissipation is PDMAX = (TJMAX–TA)/θJA or the number given in Absolute Maximum Ratings, whichever
is lower. For the LM4665, TJMAX = 150°C. See the Efficiency and Power Dissipation versus Output Power curves for more information.
Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Machine Model, 220 pF–240 pF discharged through all pins.
The exposed-DAP of the LDA10B package should be electrically connected to GND.
Operating Ratings (1)
Temperature Range TMIN ≤ TA ≤ TMAX
−40°C ≤ TA ≤ 85°C
Supply Voltage (DGS & NGZ)
2.7V ≤ VDD ≤ 5.5V
Supply Voltage (YZR0009) (Note11)
2.7V ≤ VDD ≤ 3.8V
(1)
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication
of device performance.
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM4665
3
LM4665
SNAS146E – FEBRUARY 2002 – REVISED MAY 2013
www.ti.com
Electrical Characteristics VDD = 5V (1) (2) (3)
The following specifications apply for VDD = 5V, RL = 8Ω + 33µH, measurement bandwidth is
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