NSC LME49600TS, LME49600 Datasheet

February 7, 2008

LME49600 High Performance, High Fidelity, High Current Audio Buffer

General 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.

The LME49600 offers a pin-selectable bandwidth: a low current, 110MHz bandwidth mode that consumes 7.3mA and a wide 180MHz bandwidth mode that consumes 13.2mA. In both modes the LME49600 has a nominal 2000V/μs slew rate. Bandwidth is easily adjusted by either leaving the BW pin unconnected or connecting a resistor between the BW pin and the VEE pin.

The LME49600 is fully protected through internal current limit and thermal shutdown.

Key Specifications

■ Low THD+N

OUT

= 3V

RMS

, f = 1kHz, Figure 2)

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

Features

■

Pin-selectable bandwidth and quiescent current

■

Pure fidelity. Pure performance

■

Short circuit protection

■

Thermal shutdown

■

TO–263 surface-mount package

Applications

■

Headphone amplifier output drive stage

■

Line drivers

■

Low power audio amplifiers

■

High-current operational amplifier output stage

■

ATE Pin Driver Buffer

■

Power supply regulator

Functional Block Diagram

30029805

FIGURE 1. Simplified Circuit Diagram (Note: I1 and I2 are mirrored from I)

Boomer® is a registered trademark of National Semiconductor Corporation.

LME49600 High Performance, High Fidelity, High Current Audio Buffer

Connection Diagrams

300298a0

Top View

Order Number LME49600TS

See NS Package Number TS5B

30029832

Top View

U — Wafer fabrication code

Z — Assembly plant

XY — 2 Digit date code

TT — Lot traceability

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LME49600

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage ±20V ESD Ratings(Note 4) 2000V ESD Ratings (Note 5) 200V Storage Temperature −40°C to +150°C Junction Temperature 150°C Thermal Resistance

4°C/W

65°C/W

θJA (Note 3)

20°C/W

Soldering Information TO-263 Package (10 seconds) 260°C

Operating Ratings (Notes 1, 2)

Temperature Range

MIN

≤ TA ≤ T

MAX

−40°C ≤ TA ≤ 85°C

Supply Voltage ±2.25V to ±18V

System Electrical Characteristics for LME49600 The following specifications apply for V

= ±15V,

fIN = 1kHz, unless otherwise specified. Typicals and limits apply for TA = 25°C.

Symbol Parameter Conditions

LME49600

Units

(Limits)

Typical Limit

(Note 6) (Note 7)

Total Quiescent Current

OUT

= 0 BW pin: No connect BW pin: Connected to VEE pin

7.3

13.2

10.5 18

mA (max) mA (max)

THD+N

Total Harmonic Distortion + Noise (Note 8)

AV = 1, V

OUT

= 3V

RMS

, R

= 32Ω, BW = 80kHz, closed loop see Figure 2. f = 1kHz f = 20kHz

0.000035

0.0005

% %

SR Slew Rate

30 ≤ BW ≤ 180MHz

OUT

= 20V

P-P

, RL = 100Ω

2000

V/μs

Bandwidth

AV = –3dB BW pin: No Connect

RL = 100Ω

RL = 1kΩ

100 110

MHz MHz

AV = –3dB BW pin: Connected to VEE pin

RL = 100Ω

RL = 1kΩ

160 180

MHz MHz

Voltage Noise Density

f = 10kHz BW pin: No Connect

3.0

nV/√Hz

f = 10kHz BW pin: Connected to V

2.6

nV/√Hz

Settling Time

ΔV = 10V, RL = 100Ω

1% Accuracy

BW pin: No connect

BW pin: Connected to VEE pin

200

ns ns

Voltage Gain

OUT

= ±10V

RL = 67Ω

RL = 100Ω

RL = 1kΩ

0.93

0.95

0.99

0.90

0.92

0.98

V/V (min) V/V (min) V/V (min)

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LME49600

Symbol Parameter Conditions

LME49600

Units

(Limits)

Typical Limit

(Note 6) (Note 7)

OUT

Voltage Output

Positive I

OUT

= 10mA

OUT

= 100mA

OUT

= 150mA

VCC –1.4 VCC –2.0 VCC –2.3

VCC –1.6 VCC –2.1 VCC –2.7

V (min) V (min) V (min)

Negative I

OUT

= –10mA

OUT

= –100mA

OUT

= –150mA

VEE +1.5 VEE +3.1 VEE +3.5

VEE +1.6 VEE +2.4 VEE +3.2

V (min) V (min) V (min)

OUT

Output Current

±250 mA

OUT-SC

Short Circuit Output Current

BW pin: No Connect BW pin: Connected to VEE pin

±490 ±490

±550

mA (max) mA (max)

Input Bias Current

VIN = 0V BW pin: No Connect BW pin: Connected to VEE pin

±1.0 ±3.0

±2.5 ±5.0

μA (max) μA (max)

Input Impedance

RL = 100Ω BW pin: No Connect BW pin: Connected to VEE pin

7.5

5.5

MΩ MΩ

Offset Voltage ±17 ±60 mV (max)

VOS/°C

Offset Voltage vs Temperature

40°C ≤ TA ≤ +125°C

±100

μV/°C

Note 1: All voltages are measured with respect to ground, unless otherwise specified.

Note 2: 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 guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T

JMAX

, θJA, and the ambient temperature TA. The maximum

allowable power dissipation is P

DMAX

= (T

JMAX–TA

)/θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LME49600, typical

application (shown in Figure 2) with V

SUPPLY

= 30V, RL = 32Ω, the total power dissipation is 1.9W. θJA = 20°C/W for the TO–263 package mounted to 16in2 1oz

copper surface heat sink area.

Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.

Note 5: Machine Model, 220pF – 240pF discharged through all pins.

Note 6: Typical specifications are specified at 25°C and represent the parametric norm.

Note 7: Tested limits are guaranteed to National's AOQL (Average Outgoing Quality Level).

Note 8: This is the distortion of the LME49600 operating in a closed loop configuration with an LME49710. When operating in an operational amplifier's feedback

loop, the amplifier’s open loop gain dominates, linearizing the system and determining the overall system distortion.

Note 9: The TSB 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.

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LME49600

Typical Performance Characteristics

Gain vs Frequency vs Quiescent Current

30029899

Phase vs Frequency vs Quiescent Current

30029881

Gain vs Frequency vs Power Supply Voltage

Wide BW Mode

30029898

Phase vs Frequency vs Supply Voltage

Wide BW Mode

30029880

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LME49600

Gain vs Frequency vs Power Supply Voltage

Low IQ Mode

30029897

Phase vs Frequency vs Supply Voltage

Low IQ Mode

30029879

Gain vs Frequency vs R

LOAD

Wide BW Mode

30029896

Phase vs Frequency vs R

LOAD

Wide BW Mode

30029878

Gain vs Frequency vs R

LOAD

Low IQ Mode

30029895

Phase vs Frequency vs R

LOAD

Low IQ Mode

30029877

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LME49600

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