LM4865IBPX

LM4865 www.ti.com LM4865 SNAS035G – DECEMBER 1999 – REVISED MAY 2013 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch Check for Samples: LM4865 FEATURES DESCRIPTION • • • • The LM4865 is a mono bridged audio power amplifier with DC voltage volume control. The LM4865 is capable of delivering 750mW of continuous average power into an 8Ω load with less than 1% THD when powered by a 5V power supply. Switching between bridged speaker mode and headphone (single ended) mode is accomplished using the headphone sense pin. To conserve power in portable applications, the LM4865's micropower shutdown mode (IQ = 0.7µA, typ) is activated when less than 300mV is applied to the DC Vol/SD pin. 1 2 • DC Voltage Volume Control Headphone Amplifier Mode “Click and Pop” Suppression Shutdown Control When Volume Control Pin Is Low Thermal Shutdown Protection APPLICATIONS • • • GSM Phones and Accessories, DECT, Office Phones Hand Held Radio Other Portable Audio Devices Boomer audio power amplifiers are designed specifically to provide high power audio output while maintaining high fidelity. They require few external components and operate on low supply voltages. KEY SPECIFICATION • • • • PO at 1.0% THD+N Into 8Ω SOIC, Micro SMD 750 mW (typ) PO at 10% THD+N Into 8Ω SOIC, Micro SMD 1W (typ) Shutdown Current 0.7µA(typ) Supply Voltage Range 2.7V to 5.5 V CONNECTION DIAGRAMS Figure 1. Micro SMD Package (Top View) Figure 2. Small Outline Package (SOIC) (Top View) Mini Small Outline Package (VSSOP) See Package Number D, DGK 1 2 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 © 1999–2013, Texas Instruments Incorporated LM4865 SNAS035G – DECEMBER 1999 – REVISED MAY 2013 www.ti.com TYPICAL APPLICATION Figure 3. Typical Audio Amplifier Application Circuit (Numbers in ( ) are specific to the micro SMD package) 2 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM4865 LM4865 www.ti.com SNAS035G – DECEMBER 1999 – 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) Supply Voltage 6.0V −65°C to +150°C Storage Temperature −0.3V to VDD +0.3V Input Voltage Power Dissipation (3) Internally Limited ESD Susceptibility (4) 2000V ESD Susceptibility (5) 200V Junction Temperature Soldering Information Thermal Resistance (1) (2) (3) (4) (5) 150°C Vapor Phase (60 sec.) 215°C Infrared (15 sec.) 220°C θJC (SOIC) 35°C/W θJA (SOIC) 150°C/W θJC (VSSOP) 56°C/W θJA (VSSOP) 190°C/W θJA (micro SMD) 150°C/W 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 that ensure specific performance limits. This assumes that the device operates within the Operating Ratings. Specifications are not ensured for parameters where no limit is given. The typical value, however, is a good indication of device performance. If Military/Aerospace specified devices are required, please contact the Texas Instruments 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 the Absolute Maximum Ratings, whichever is lower. For the LM4865M, TJMAX = 150°C. Human body model, 100pF discharged through a 1.5kΩ resistor. Machine Model, 220pF–240pF discharged through all pins. OPERATING RATINGS Temperature Range TMIN ≤ TA ≤ TMAX −40°C ≤ TA ≤ +85°C 2.7V ≤ VDD ≤ 5.5V Supply Voltage Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM4865 3 LM4865 SNAS035G – DECEMBER 1999 – REVISED MAY 2013 ELECTRICAL CHARACTERISTICS www.ti.com (1) (2) The following specifications apply for VDD = 5V, unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter VDD Conditions Supply Voltage Typical (4) Max (3) Units 5.5 V VIN = 0V, IO = 0A, HP Sense = 0V 4 7 mA VIN = 0V, IO - 0A, HP Sense = 5V 3.5 6 mA 0.7 50 mV Quiescent Power Supply Current ISD Shutdown Current VPIN4 ≤ 0.3V VOS Output Offset Voltage VIN = 0V 5 THD = 1% (max), HP Sense < 0.8V, f = 1kHz, RL = 8Ω Output Power Min 2.7 IDD PO LM4865 (3) 500 µA 750 mW THD = 10% (max), HP Sense < 0.8V, f = 1kHz, RL = 8Ω 1.0 W THD + N = 1%, HP Sense > 4V, f = 1kHz, RL = 32Ω 80 mW THD = 10%, HP Sense > 4V, f = 1kHz, RL = 32Ω 110 mW THD+N Total Harmonic Distortion + Noise PO = 300 mWrms, f = 20Hz–20kHz, RL = 8Ω 0.6 % PSRR Power Supply Rejection Ratio VRIPPLE = 200mVrms, RL = 8Ω, CB = 1.0 µF, f = 1kHz 50 dB GainRANGE Single-Ended Gain Range VIH HP Sense High Input Voltage VIL HP Sense Low Input Voltage (1) (2) (3) (4) Gain with VPIN4 ≥ 4.0V, (80% of VDD) 18.8 20 dB Gain with VPIN4 ≤ 0.9V, (18% of VDD) −70 −72 dB 4 V 0.8 V 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 that ensure specific performance limits. This assumes that the device operates within the Operating Ratings. Specifications are not ensured for parameters where no limit is given. The typical value, however, is a good indication of device performance. Limits are ensured to AOQL (Average Outgoing Quality Level). Typicals are measured at 25°C and represent the parametric norm. EXTERNAL COMPONENTS DESCRIPTION (Figure 3 ) Components 4 Functional Description 1. Ci Input coupling capacitor which blocks the DC voltage at the amplifier's input terminals. It also creates a highpass filter with the internal Ri. The designer should note that10kOhm