lme49610ts National Semiconductor Corporation, lme49610ts Datasheet

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lme49610ts

Manufacturer Part Number
lme49610ts
Description
High Performance, High Fidelity, High Current Audio Buffer
Manufacturer
National Semiconductor Corporation
Datasheet
© 2008 National Semiconductor Corporation
LME49610
High Performance, High Fidelity, High Current Audio Buffer
General Description
The LME49610 is a high performance, low distortion high fi-
delity 250mA audio buffer. The LME49610 is designed for a
wide range of applications. When used inside the feedback
loop of an op amp, it increases output current, improves ca-
pacitive load drive, and eliminates thermal feedback.
The LME49610 offers a pin-selectable bandwidth: a low cur-
rent, 120MHz bandwidth mode that consumes 13mA and a
wide 200MHz bandwidth mode that consumes 19mA. In both
modes the LME49610 has a nominal 2000V/μs slew rate.
Bandwidth is easily adjusted by either leaving the BW pin un-
connected, connecting it to the V
tor between the BW pin and the V
The LME49610 is fully protected through internal current limit
and thermal shutdown.
Functional Block Diagram
Boomer® is a registered trademark of National Semiconductor Corporation.
EE
EE
pin or connecting a resis-
pin.
300425
FIGURE 1. Functional Block Diagram
Key Specifications
Features
Applications
■ 
   (V
■ 
■ 
■ 
■ 
Pin-selectable bandwidth and quiescent current
Pure fidelity. Pure performance
Short circuit protection
Thermal shutdown
TO–263 surface-mount package
Headphone amplifier output drive stage
Line drivers
Low power audio amplifiers
High-current operational amplifier output stage
ATE pin driver buffer
Power supply regulator
Low THD+N
Slew Rate
High Output Current
Bandwidth
Supply Voltage Range
BW pin floating
BW connected to V
OUT
= 3V
RMS
, f = 1kHz, Fig. 2)
EE
30042541
±2.25V
0.00003% (typ)
2000V/μs (typ)
120MHz (typ)
200MHz (typ)
www.national.com
250mA (typ)
April 9, 2008
V
DD
±22V

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lme49610ts Summary of contents

Page 1

... BW pin and the V EE The LME49610 is fully protected through internal current limit and thermal shutdown. Functional Block Diagram Boomer® registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation Key Specifications ■  Low THD+N    (V ■ ...

Page 2

... Connection Diagrams www.national.com TO-263 Package (Note 9) 30042539 Top View Order Number LME49610TS See NS Package Number TS5B 30042542 Top View U — Wafer fabrication code Z — Assembly plant XY — 2 Digit date code TT — Lot traceability 2 ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ESD Rating (Note 4) ESD Rating (Note 5) Storage Temperature Junction Temperature Thermal Resistance  θ JC Electrical ...

Page 4

Symbol Parameter V Voltage Output OUT I Output Current OUT I Short Circuit Output Current OUT-SC I Input Bias Current B Z Input Impedance IN V Offset Voltage OS V /°C Offset Voltage vs Temperature OS Power Supply Voltage Operating ...

Page 5

Typical Performance Characteristics Gain vs Frequency vs Quiescent Current V = ±22V S Gain vs Frequency vs Power Supply Voltage Wide BW Mode (BW pin = V Gain vs Frequency vs Power Supply Voltage Low I Mode (BW pin = ...

Page 6

Gain vs Frequency vs R Wide BW Mode (BW pin = V Gain vs Frequency vs R Low I Mode (BW pin = Float Gain vs Frequency vs Quiescent Current V = ±15V S www.national.com LOAD ), V ...

Page 7

Gain vs Frequency vs R LOAD Wide BW Mode (BW pin = ±15V EE S Gain vs Frequency vs R LOAD Low I Mode (BW pin = Float ±15V Q S +PSRR vs Frequency ...

Page 8

Frequency V = ±15V and ±22V, Wide BW Mode S (BW pin = V Quiescent Current vs Bandwidth Control Resistance V = ±15V (Bottom) & Wide BW Noise Curve (BW pin = V www.national.com ) EE ...

Page 9

Typical Application Diagram FIGURE 2. High Performance, High Fidelity LME49610 Audio Buffer Application 9 30042540 www.national.com ...

Page 10

Application Information HIGH PERFORMANCE, HIGH FIDELITY HEADPHONE AMPLIFIER The LME49610 is the ideal solution for high output, high per- formance high fidelity headphone amplifiers. When placed in the feedback loop of the LME49710, LME49720 or LME49740 High Performance, High Fidelity ...

Page 11

AUDIO BUFFERS Audio buffers or unity-gain followers, have large current gain and a voltage gain of one. Audio buffers serve many applica- tions that require high input impedance, low output impedance and high output current. They also offer constant gain ...

Page 12

OVERVOLTAGE PROTECTION If the input-to-output differential voltage exceeds the LME49610’s Absolute Maximum Rating of 3V, the internal diode clamps shown in Figure 1 conduct, diverting current around the compound emitter followers of Q1/Q5 (D1 – D7 for positive input), or ...

Page 13

JA FIGURE 6. Thermal Resistance (typ) for 5 lead TO-263 Package Mounted on 1oz. copper A copper plane may be placed directly ...

Page 14

Applying Equation (5): θ = 40°C/1.87W JA = 21.4°C/W Examining the Copper Area vs. θ JA cates that a thermal resistance of 21.4°C/W is possible with a 8–10in 2 plane of one layer of 1oz copper. Other solutions include using ...

Page 15

FIGURE 7. High Speed Positive and Negative Regulator 15 300425a7 www.national.com ...

Page 16

Revision History Rev 1.0 www.national.com Date 04/09/08 Initial release. 16 Description ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LME49610TS See NS Package TS5B 17 www.national.com ...

Page 18

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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