Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 1-channel (mono) Class D WSON 8 (3x3)

LM4673, LM4673SDBD, LM4673TMBD

www.ti.com

SNAS317D –DECEMBER 2005–REVISED MAY 2013

LM4673 Filterless, 2.65W, Mono, Class D Audio Power

Amplifier

Check for Samples: LM4673, LM4673SDBD, LM4673TMBD

FEATURES

DESCRIPTION

The LM4673 is a single supply, high efficiency,

• Mono Class D Operation

2.65W, mono, Class D audio amplifier. A low noise,

• No Output Filter Required for Inductive Loads

filterless PWM architecture eliminates the output filter,

• Externally Configurable Gain

reducing external component count, board area

consumption, system cost, and simplifying design.

• Very Fast Turn On Time: 17μs (typ)

• Minimum External Components

The LM4673 is designed to meet the demands of

mobile phones and other portable communication

• "Click and Pop" Suppression Circuitry

devices. Operating on a single 5V supply, it is

• Micro-Power Shutdown Mode

capable of driving a 4Ω speaker load at a continuous

• Available in Space-Saving 0.4mm Pitch

average output of 2.1W with less than 1% THD+N. Its

DSBGA and WSON Packages

flexible power supply requirements allow operation

from 2.4V to 5.5V.

APPLICATIONS

The LM4673 has high efficiency with speaker loads

compared to a typical Class AB amplifier. With a 3.6V

• Mobile Phones

supply driving an 8Ω speaker, the IC's efficiency for a

• PDAs

100mW power level is 80%, reaching 88% at 400mW

• Portable Electronic Devices

output power.

The LM4673 features a low-power consumption

KEY SPECIFICATIONS

shutdown mode. Shutdown may be enabled by

• Efficiency at 3.6V, 400mW into 8Ω Speaker

driving the Shutdown pin to a logic low (GND).

88% (typ)

The gain of the LM4673 is externally configurable

• Efficiency at 3.6V, 100mW into 8Ω Speaker

which allows independent gain control from multiple

80% (typ)

sources by summing the signals. Output short circuit

and thermal overload protection prevent the device

• Efficiency at 5V, 1W into 8Ω Speaker 86% (typ)

from damage during fault conditions.

• Quiescent Current, 3.6V Supply 2.1mA (typ)

• Total Shutdown Power Supply Current

0.01µA (typ)

• Single Supply Range 2.4V to 5.5V

• PSRR, f = 217Hz 78dB

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.

2All 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.

Summary of content (28 pages)

PAGE 1
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier Check for Samples: LM4673, LM4673SDBD, LM4673TMBD FEATURES DESCRIPTION • • • • • • • • The LM4673 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.
PAGE 2
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com Typical Application Figure 1. Typical Audio Amplifier Application Circuit Connection Diagram GND IN+ A Vo1 VDD B PGND IN- C Vo2 1 3 2 SHUTDOWN PVDD Figure 2. 9-Bump DSBGA - Top View See YFQ0009 Package Figure 3. 8-Pin WSON - Top View See NGQ0008A These devices have limited built-in ESD protection.
PAGE 3
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 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 Power Dissipation (4) ESD Susceptibility, all other pins Internally Limited (5) 2.0kV ESD Susceptibility (6) 200V Junction Temperature (TJMAX) Thermal Resistance 150°C θJA (DSBGA) 99.
PAGE 4
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com Electrical Characteristics (1) (2) The following specifications apply for AV = 2V/V (RI = 150kΩ), RL = 15µH + 8Ω + 15µH unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4673 Typical (3) Limit (4) (5) Units (Limits) |VOS| Differential Output Offset Voltage VI = 0V, AV = 2V/V, VDD = 2.4V to 5.0V |IIH| Logic High Input Current VDD = 5.0V, VI = 5.
PAGE 5
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 Electrical Characteristics(1)(2) (continued) The following specifications apply for AV = 2V/V (RI = 150kΩ), RL = 15µH + 8Ω + 15µH unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4673 Typical (3) Limit (4) (5) Units (Limits) RL = 15μH + 8Ω + 15μH THD = 10% (max) f = 1kHz, 22kHz BW PO Output Power THD+N PSRR SNR εOUT VDD = 5V 1.7 W VDD = 3.6V 870 mW VDD = 2.
PAGE 6
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics The performance graphs were taken using the Audio Precision AUX-0025 Switching Amplifier measurement Filter in series with the LC filter on the demo board. THD + N vs Output Power f = 1kHz, RL = 8Ω THD + N vs Output Power f = 1kHz, RL = 4Ω 100 100 VDD = 5V VDD = 5V 10 10 VDD = 3.6V THD+N (%) THD+N (%) VDD = 3.6V VDD = 2.5V 1 VDD = 2.5V 1 0.1 0.1 0.01 0.001 0.01 0.1 1 0.
PAGE 7
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 Typical Performance Characteristics (continued) The performance graphs were taken using the Audio Precision AUX-0025 Switching Amplifier measurement Filter in series with the LC filter on the demo board. THD + N vs Frequency VDD = 2.5V, POUT = 100mW, RL = 4Ω 100 100 10 10 THD+N (%) THD+N (%) THD + N vs Frequency VDD = 5V, POUT = 200mW, RL = 8Ω 1 0.1 0.01 0.1 0.01 0.001 10 100 1000 10000 100000 0.
PAGE 8
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) The performance graphs were taken using the Audio Precision AUX-0025 Switching Amplifier measurement Filter in series with the LC filter on the demo board. Efficiency vs. Output Power RL = 4Ω, f = 1kHz Efficiency vs. Output Power RL = 8Ω, f = 1kHz 100 100 90 90 V DD = 5V VDD = 5V 80 70 EFFICIENCY (%) EFFICIENCY (%) 80 V DD = 3.6V 60 V DD = 2.
PAGE 9
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 Typical Performance Characteristics (continued) The performance graphs were taken using the Audio Precision AUX-0025 Switching Amplifier measurement Filter in series with the LC filter on the demo board. Output Power vs. Supply Voltage RL = 8Ω, f = 1kHz 4000 2000 3500 1750 OUTPUT POWER (mW) OUTPUT POWER (mW) Output Power vs.
PAGE 10
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) The performance graphs were taken using the Audio Precision AUX-0025 Switching Amplifier measurement Filter in series with the LC filter on the demo board. Supply Current vs. Supply Voltage No Load 4 SUPPLY CURRENT (mA) 3.5 3 2.5 2 1.5 1 0.5 0 2.5 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V) Figure 20.
PAGE 11
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 APPLICATION INFORMATION GENERAL AMPLIFIER FUNCTION The LM4673 features a filterless modulation scheme. The differential outputs of the device switch at 300kHz from VDD to GND. When there is no input signal applied, the two outputs (VO1 and VO2) switch with a 50% duty cycle, with both outputs in phase. Because the outputs of the LM4673 are differential, the two signals cancel each other.
PAGE 12
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com The inductive nature of the transducer load can also result in overshoot on one or both edges, clamped by the parasitic diodes to GND and VDD in each case. From an EMI standpoint, this is an aggressive waveform that can radiate or conduct to other components in the system and cause interference. It is essential to keep the power and output traces short and well shielded if possible.
PAGE 13
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 DIFFERENTIAL CIRCUIT CONFIGURATIONS The LM4673 can be used in many different circuit configurations. The simplest and best performing is the DC coupled, differential input configuration shown in Figure 21. Equation 2 above is used to determine the value of the Ri resistors for a desired gain. Input capacitors can be used in a differential configuration as shown in Figure 22.
PAGE 14
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com Figure 22. Differential Input Configuration with Input Capacitors Figure 23. Dual Differential Input Configuration Figure 24.
PAGE 15
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 Figure 25. Dual Single-Ended Input Configuration Figure 26.
PAGE 16
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.com REFERENCE DESIGN BOARD SCHEMATIC In addition to the minimal parts required for the application circuit, a measurement filter is provided on the evaluation circuit board so that conventional audio measurements can be conveniently made without additional equipment.
PAGE 17
LM4673, LM4673SDBD, LM4673TMBD www.ti.
PAGE 18
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.
PAGE 19
LM4673, LM4673SDBD, LM4673TMBD www.ti.
PAGE 20
LM4673, LM4673SDBD, LM4673TMBD SNAS317D – DECEMBER 2005 – REVISED MAY 2013 www.ti.
PAGE 21
LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 REVISION HISTORY Rev Date Description 1.0 12/16/05 Initial WEB released. 1.1 02/28/06 Taken out “Future Product”, then re-WEBd the datasheet. 1.2 04/06/06 Added the TM and SD demo boards, then released to the WEB (per Royce). 1.3 11/01/07 Deleted a sentence under the SHUTDOWN FUNCTION section. Changes from Revision C (May 2013) to Revision D • Page Changed layout of National Data Sheet to TI format .....
PAGE 22
PACKAGE OPTION ADDENDUM www.ti.
PAGE 23
PACKAGE OPTION ADDENDUM www.ti.com 14-Aug-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PAGE 24
PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LM4673SD/NOPB WSON NGQ 8 LM4673TM/NOPB DSBGA YFQ LM4673TMX/NOPB DSBGA YFQ SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 9 250 178.0 8.4 1.5 1.5 0.76 4.0 8.0 Q1 9 3000 178.0 8.4 1.5 1.5 0.76 4.0 8.
PAGE 25
PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM4673SD/NOPB WSON NGQ 8 1000 210.0 185.0 35.0 LM4673TM/NOPB DSBGA YFQ 9 250 210.0 185.0 35.0 LM4673TMX/NOPB DSBGA YFQ 9 3000 210.0 185.0 35.
PAGE 26
MECHANICAL DATA NGQ0008A SDA08A (Rev A) www.ti.
PAGE 27
MECHANICAL DATA YFQ0009xxx D 0.600±0.075 E TMD09XXX (Rev A) D: Max = 1.397 mm, Min =1.336 mm E: Max = 1.397 mm, Min =1.336 mm 4215077/A NOTES: A. All linear dimensions are in millimeters. Dimensioning and tolerancing per ASME Y14.5M-1994. B. This drawing is subject to change without notice. www.ti.
PAGE 28
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.