LM4871LD/NOPB

Part: LM4871 3W Audio Power Amplifier, Texas Instruments

Type: Mono Bridged Audio Power Amplifier

Description: The LM4871 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3 Ω load with less than 10% THD when powered by a 5V supply, featuring a micropower shutdown mode (0.6 μA typ) and operating from 2.0V to 5.5V.

Operating Conditions:

• Supply voltage: 2.0V to 5.5V
• Operating temperature: -40°C to 85°C
• Max output power: 3W into 3 Ω (LM4871LD package)

Absolute Maximum Ratings:

• Max supply voltage: 6.0V
• Max junction temperature: 150°C

Key Specs:

• Supply Voltage: 2.0V (min) to 5.5V (limit)
• Quiescent Power Supply Current: 6.5 mA (typ) @ V_IN = 0V, I_o = 0A
• Shutdown Current: 0.6 μA (typ) @ V_PIN1 = V_DD
• Output Offset Voltage: 5.0 mV (typ) @ V_IN = 0V
• Output Power (LM4871LD): 3 W (typ) into 3 Ω @ THD+N = 10%, f = 1kHz
• Output Power (LM4871): 1.5 W (typ) into 8 Ω @ THD+N = 10%, f = 1kHz
• Total Harmonic Distortion+Noise: 0.25% (typ) @ 20Hz ≤ f ≤ 20kHz, A_VD = 2, R_L = 8 Ω, P_O = 1W
• Power Supply Rejection Ratio (PSRR): 60 dB (typ) @ V_DD = 4.9V to 5.1V

Features:

• No Output Coupling Capacitors, Bootstrap Capacitors, or Snubber Circuits Required
• Unity-gain Stable
• WSON, VSSOP, SOIC, or PDIP Packaging
• External Gain Configuration Capability
• Pin Compatible with the LM4861

Applications:

• Portable Computers
• Desktop Computers
• Low Voltage Audio Systems

Package:

• WSON
• VSSOP
• SOIC
• PDIP

• 2 · No Output Coupling Capacitors, Bootstrap Capacitors, or Snubber Circuits Required
• Unity-gain Stable
• WSON, VSSOP, SOIC, or PDIP Packaging
• External Gain Configuration Capability
• Pin Compatible with the LM4861

• Portable Computers
• Desktop Computers
• Low Voltage Audio Systems

The following specifications apply for VDD = 5V and RL = 8 Ω unless otherwise specified. Limits apply for TA = 25°C.

• (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.
• (2) All voltages are measured with respect to the ground pin, unless otherwise specified.
• (3) Typicals are specified at 25°C and represent the parametric norm.
• (4) Limits are specified to TI's AOQL (Average Outgoing Quality Level).

Supply Voltage

6.0V

Supply Temperature

• 65°C to +150°C

Input Voltage

• 0.3V to VDD to +0.3V

Power Dissipation (3)

Internally Limited

ESD Susceptibility (4)

5000V

ESD Susceptibility (5)

250V

Junction Temperature

150°C

Soldering Information

Small Outline Package

Vapor Phase (60 sec.)

215°C

Infrared (15 sec.)

220°C

θ JC (typ)-D0008A

35°C/W

θ JA (typ)-D0008A

140°C/W

θ

JC (typ)-D0008E

37°C/W

θ JA (typ)-D0008E

107°C/W

θ JC (typ)-DGK0008A

56°C/W

θ JA (typ)-DGK0008A

210°C/W

θ JC (typ)-NGN0008A

4.3°C/W

θ

JA (typ)-NGN0008A

56°C/W (6)

• (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.
• (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications.
• (3) The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θ JA , and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX-TA)/ θ JA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4871, TJMAX = 150°C. For the θ JA 's for different packages, please see the Application Information section or the absolute maximum ratings section.
• (4) Human body model, 100pF discharged through a 1.5k Ω resistor.
• (5) Machine Model, 220pF-240pF discharged through all pins.
• (6) The given θ JA is for an LM4871 packaged in an NGN0008A with the Exposed-DAP soldered to an exposed 1in 2 area of 1oz printed circuit board copper.

Figure 3. Typical Audio Amplifier Application Circuit

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.

Figure 3. Typical Audio Amplifier Application Circuit