Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Audio amplifier 1-channel (mono) Class AB TO 263 5

IN OUT

LME49600LME49710

0.1PF

10 PF

LME49600

www.ti.com

SNAS422E –JANUARY 2008–REVISED APRIL 2013

LME49600 High-Performance, High-Fidelity, High-Current Headphone Buffer

Check for Samples: LME49600

FEATURES

DESCRIPTION

The LME49600 is a high performance, low distortion

• Pin-Selectable Bandwidth and Quiescent

high fidelity 250mA audio buffer. The LME49600 is

Current

designed for a wide range of applications. It can be

• Pure Fidelity, Pure Performance

used inside the feedback loop of op amps.

• Short Circuit Protection

The LME49600 offers a pin-selectable bandwidth: a

• Thermal Shutdown

low current, 110MHz bandwidth mode that consumes

7.3mA and a wide 180MHz bandwidth mode that

• TO–263 Surface-Mount Package

consumes 13.2mA. In both modes the LME49600 has

a nominal 2000V/μs slew rate. Bandwidth is easily

APPLICATIONS

adjusted by either leaving the BW pin unconnected or

• Headphone Amplifier Output Drive Stage

connecting a resistor between the BW pin and the

• Line Drivers V

pin.

• Low Power Audio Amplifiers

The LME49600 is fully protected through internal

current limit and thermal shutdown.

• High-Current Operational Amplifier Output

Stage

KEY SPECIFICATIONS

• ATE Pin Driver Buffer

• Low THD+N (V

OUT

= 3V

RMS

, f = 1kHz,

• Power Supply Regulator

Figure 26): 0.00003% (typ)

• Slew Rate: 2000V/μs (typ)

• High Output Current: 250mA (typ)

• Bandwidth

– BW Pin Floating: 110MHz (typ)

– BW Connected to V

: 180MHz (typ)

• Supply Voltage Range: ±2.25V ≤ V

≤ ±18V

Typical Application Diagram

Figure 1. High Performance, High Fidelity LME49600 Audio Buffer Application

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 (20 pages)

PAGE 1
LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 LME49600 High-Performance, High-Fidelity, High-Current Headphone Buffer Check for Samples: LME49600 FEATURES DESCRIPTION • The LME49600 is a high performance, low distortion high fidelity 250mA audio buffer. The LME49600 is designed for a wide range of applications. It can be used inside the feedback loop of op amps.
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LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com Functional Block Diagram VCC Thermal Shutdown I1 D1 - D7 Q5 I Q3 Q1 IN Q2 OUT 200: Q4 BW Q6 D8 - D14 I2 VEE Figure 2. Simplified Circuit Diagram (Note: I1 and I2 are mirrored from I) Connection Diagram TAB (VEE) AV = 1 1 2 3 BW 4 5 VEE VIN VCC VOUT The KTT package is non-isolated package. The package's metal back and any heat sink to which it is mounted are connected to the same potential as the -VEE pin. Figure 3.
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LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 ABSOLUTE MAXIMUM RATINGS (1) (2) (3) Supply Voltage ±20V ESD Ratings (4) 2000V ESD Rating (5) 200V −40°C to +150°C Storage Temperature Junction Temperature Thermal Resistance 150°C θJC 4°C/W θJA θJA Soldering Information (1) (2) (3) (4) (5) (6) 65°C/W (6) 20°C/W TO-263 Package (10 seconds) 260°C All voltages are measured with respect to ground, unless otherwise specified.
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LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com SYSTEM ELECTRICAL CHARACTERISTICS FOR LME49600 The following specifications apply for VS = ±15V, fIN = 1kHz, unless otherwise specified. Typicals and limits apply for TA = 25°C. Symbol IQ THD+N SR Parameter Total Quiescent Current IOUT = 0 BW pin: No connect BW pin: Connected to VEE pin Total Harmonic Distortion + Noise (3) AV = 1, VOUT = 3VRMS, RL = 32Ω, BW = 80kHz, closed loop see Figure 26. f = 1kHz f = 20kHz 7.3 13.2 10.
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LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Gain vs Frequency vs Quiescent Current Phase vs Frequency vs Quiescent Current 0 20 IQ = 10.3 -10 15 PHASE (°) GAIN (dB) IQ = 13.3 10 -20 -30 5 IQ = 7.4 -40 0 -5 1M -50 1M 10M 100M 1G IQ = 13.3 mA IQ = 10.3 mA IQ=7.4 mA 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) Figure 4. Figure 5.
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LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Gain vs Frequency vs RLOAD Wide BW Mode Phase vs Frequency vs RLOAD Wide BW Mode 0 20 PHASE (°) GAIN (dB) -10 RL = 1 k: 15 10 RL = 100: -20 -30 5 RL = 1 k: RL = 100: RL = 50: -40 0 RL = 50: -5 1M 10M 100M -50 1M 1G 10M 100M 1G FREQUENCY (Hz) FREQUENCY (Hz) Figure 10. Figure 11.
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LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Gain vs Frequency vs CLOAD Low IQ Mode Phase vs Frequency vs CLOAD Low IQ Mode 0 20 CL = 50 pF CL = 0 pF CL = 50 pF CL = 200 pF CL = 1000 pF -10 PHASE (°) GAIN (dB) 15 10 CL = 0 pF 5 -20 -30 CL = 200 pF -40 0 CL = 1000 pF -5 1M 10M 100M -50 1M 1G 10M Figure 17.
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LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) THD+N vs Output Voltage VS = ±15V, RL = 32Ω, f = 1kHz Both channels driven 0.01 14 13 12 0.001 THD+N (%) QUIESCENT POWER SUPPLY CURRENT (mA) Quiescent Current vs Bandwidth Control Resistance 11 10 9 0.0001 8 7 6 10 100 10000 1000 0.00001 0.00001 0.0001 0.001 100000 Figure 23.
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LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 TYPICAL APPLICATION DIAGRAM RFB V + 0.1 PF 10 PF + RIN - VCC VCC IN LME49710 VIN + VEE OUT LME49600 0.1 PF VEE 10 PF + RL BW - V Figure 26. High Performance, High Fidelity LME49600 Audio Buffer Application DISTORTION MEASUREMENTS The vanishingly low residual distortion produced by LME49710/LME49600 is below the capabilities of all commercially available equipment.
PAGE 10
LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION HIGH PERFORMANCE, HIGH FIDELITY HEADPHONE AMPLIFIER The LME49600 is the ideal solution for high output, high performance high fidelity head phone amplifiers. When placed in the feedback loop of the LME49710, LME49720 or LME49740 High Performance, High Fidelity audio operational amplifier, the LME49600 is able to drive 32Ω headphones to a dissipation of greater than 500mW at 0.
PAGE 11
LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 AUDIO BUFFERS Audio buffers or unity-gain followers, have large current gain and a voltage gain of one. Audio buffers serve many applications that require high input impedance, low output impedance and high output current. They also offer constant gain over a very wide bandwidth. Buffers serve several useful functions, either in stand-alone applications or in tandem with operational amplifiers.
PAGE 12
LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com OUTPUT CURRENT The LME49600 can continuously source or sink 250mA. Internal circuitry limits the short circuit output current to approximately ±450mA. For many applications that fully utilize the LME49600’s current source and sink capabilities, thermal dissipation may be the factor that limits the continuous output current. The maximum output voltage swing magnitude varies with junction temperature and output current.
PAGE 13
LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 Unity gain stability is preserved when the LME49600 is placed in the feedback loop of most general-purpose or precision op amps. When the LME46900 is driving high value capacitive loads, the BW pin should be connected to the VEE pin for wide bandwidth and stable operation. The wide bandwidth mode is also suggested for high speed or fast-settling operational amplifiers.
PAGE 14
LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com THERMAL IMPEDANCE (TJA) 70 60 50 40 30 20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 2 COPPER HEAT SINK AREA (in ) Figure 30. Thermal Resistance for 5-lead TO–263 Package Mounted on 1oz. Copper A copper plane may be placed directly beneath the tab. Additionally, a matching plane can be placed on the opposite side.
PAGE 15
LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 PDMAX(DC) = (IS x VS) + (VS)2 / RL (Watts) where • • VS = |VEE| + VCC (V) IS =quiescent supply current (A) (3) Equation (2) is for sinusoidal output voltages and Equation (3) is for DC output voltages. 2. Determine the maximum allowable die temperature rise, TRISE(MAX) = TJ(MAX) - TA(MAX) (°C) (4) 3.
PAGE 16
LME49600 SNAS422E – JANUARY 2008 – REVISED APRIL 2013 www.ti.com V + Positive Regulator 300: 1 k: - 6550: +VREG + OUT 1 PF LM4040-5.0 LME49710 Negative Regulator 300: LME49600 1 k: - LM4040-5.0 -VREG + 1 PF OUT - - V 6550: V - LME49710 V LME49600 Figure 31.
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LME49600 www.ti.com SNAS422E – JANUARY 2008 – REVISED APRIL 2013 REVISION HISTORY Rev Date 1.0 01/15/08 Initial release. Description 1.01 01/16/08 Edited specification table. 1.02 02/07/08 Edited applications information. 1.03 03/28/08 Text edits.
PAGE 18
PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 PACKAGING INFORMATION Orderable Device Status (1) LME49600TS/NOPB ACTIVE Package Type Package Pins Package Drawing Qty DDPAK/ TO-263 KTT 5 45 Eco Plan Lead/Ball Finish (2) Pb-Free (RoHS Exempt) MSL Peak Temp Op Temp (°C) Top-Side Markings (3) CU SN Level-3-245C-168 HR (4) -40 to 85 LME49600 TS (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
PAGE 19
MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.
PAGE 20
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.