lm4816mt National Semiconductor Corporation, lm4816mt Datasheet

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lm4816mt

Manufacturer Part Number
lm4816mt
Description
1w Stereo Audio Amplifier + Adjustable Output Limiter
Manufacturer
National Semiconductor Corporation
Datasheet
© 2003 National Semiconductor Corporation
LM4816
1W Stereo Audio Amplifier + Adjustable Output Limiter
General Description
The LM4816 combines a bridged-connected (BTL) stereo
audio power amplifier with an adjustable output voltage mag-
nitude limiter. The audio amplifier delivers 1.0W to an 8Ω
load with less than 1.0% THD+N while operating on a 5V
power supply. With V
clamped to 6V
The LM4816 features an external controlled micropower
shutdown mode and thermal shutdown protection. It also
utilizes circuitry that reduces “clicks and pops” during device
turn-on and return from shutdown.
Boomer audio power amplifiers are designed specifically to
use few external components and provide high quality output
power in a surface mount package.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
p-p
,
±
800mV.
LIM
set to 1.0V, the amplifier outputs are
DS200332
Key Specifications
Features
n Stereo BTL amplifier
n Adjustable output voltage magnitude limiter
n “Click and pop” suppression circuitry
n Unity-gain stable audio amplifiers
n Thermal shutdown protection circuitry
n TSSOP (MT) package
Applications
n Notebook computers
n Multimedia monitors
n Desktop computers
n Portable televisions
j
j
j
j
P
Power supply range
Limiter adjustment range
Shutdown current
OUT
V
DD
(BTL):
= 5V, THD = 1%, R
L
= 8Ω
20033201
GND to V
October 2003
www.national.com
3.0V to 5.5V
0.06µA (typ)
1.0W (typ)
DD
/2

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lm4816mt Summary of contents

Page 1

... Boomer audio power amplifiers are designed specifically to use few external components and provide high quality output power in a surface mount package. Typical Application Boomer is a registered trademark of National Semiconductor Corporation. ® © 2003 National Semiconductor Corporation Key Specifications P (BTL): ...

Page 2

... Connection Diagram www.national.com Top View Order Number LM4816MT See NS Package Number MTC20 for TSSOP 2 20033229 ...

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 Storage Temperature Input Voltage Power Dissipation (Note 2) ESD Susceptibility(Note 3) ESD Susceptibility (Note 4) Junction Temperature ...

Page 4

Note 3: Human body model, 100pF discharged through a 1.5kΩ resistor. Note 4: Machine model, 220pF–240pF discharged through all pins. Note 5: All voltages are measured with respect to the ground (GND) pins unless otherwise specified. Note 6: Typicals are ...

Page 5

Typical Performance Characteristics THD+N vs Frequency V = 5.5V 8Ω OUT THD+N vs Output Power 8Ω (from left to right at 7% THD+N ...

Page 6

Typical Performance Characteristics PSRR vs Frequency 8Ω SOURCE V = 200mV , at (from top to bottom at 500Hz): RIPPLE P 0.1µF, C BYPASS BYPASS Cross Talk V = 3V, ...

Page 7

Typical Performance Characteristics Output Power vs Load Resistance 1kHz, at (from top to bottom at 32Ω): DD IN THD+N = 10%, THD Power Dissipation vs Output Power 1kHz, ...

Page 8

External Components Description (Refer to Figure 1 .) Components 1. R The Inverting input resistance, along with R i filter with f = 1/(2π The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C ...

Page 9

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4816 consists of two pairs of operational amplifiers, forming a two-channel (channel A and channel B) stereo amplifier. (Though the following discusses channel A, it applies equally to channel ...

Page 10

Application Information presence does not eliminate the need for a local 1.0µF tantalum bypass capacitance connected between the LM4816’s supply pins and ground. Do not substitute a ce- ramic capacitor for the tantalum. Doing so may cause oscil- lation in ...

Page 11

Application Information the voltage applied to the BYPASS pin. The gain of the internal amplifiers remains unity until the voltage on the bypass pin reaches 1 soon as the voltage on the DD BYPASS pin is stable, ...

Page 12

Application Information this margin, the amplifier can be used in designs that require more differential gain while avoiding performance-restricting bandwidth limitations. www.national.com (Continued) 12 ...

Page 13

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted Order Number LM4816MT NS Package Number MTC20 2 ...

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