LM4817MH National Semiconductor, LM4817MH Datasheet

LM4817MH

Manufacturer Part Number
LM4817MH
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4817MH

Operational Class
Class-AB
Audio Amplifier Output Configuration
2-Channel Stereo
Output Power (typ)
1.1x2@8OhmW
Audio Amplifier Function
Speaker
Total Harmonic Distortion
0.13@8Ohm@1W%
Single Supply Voltage (typ)
5V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Rail/rail I/o Type
No
Power Supply Rejection Ratio
67dB
Single Supply Voltage (min)
3V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
28
Package Type
TSSOP EP
Lead Free Status / Rohs Status
Not Compliant

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© 2006 National Semiconductor Corporation
LM4817
1W Stereo Audio Amplifier Plus Adjustable Output
Limiter Plus Adjustable LDO
General Description
The LM4817 combines a bridge-connected (BTL) stereo
audio power amplifier with a low dropout voltage regulator
(LDO). The audio amplifier delivers 1.0W to a 8Ω load with a
less than 1.0% THD+N while operating on a 5V power
supply. With V
clamped to 6V
With the LM4817’s adjustable low-dropout (LDO) CMOS
linear regulator delivers an output current of up to 300mA,
has shutdown mode (1nA, typ) low quiescent current (90µA,
typ) and LDO voltage (120mV, typ). The regulator is stable
with small ceramic capacitive load (2.2µF, typ). The regulator
includes regulation fault detection, a bandgap voltage refer-
ence, and constant current limiting. It is designed for low
power, low current applications that can take advantage of
its 300mA output current capability.
The LM4817 features an externally 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.
Connection Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
p-p
LIM
,
±
set to 1.0V, the amplifier outputs are
800mV.
See NS Package Number MXA28A for TSSOP
DS200781
Order Number LM4817MH
Top View
Key Specifications
n P
n Power supply range (amplifier)
n Power supply range (LDO)
n Shutdown current
n LDO output current
n LDO dropout voltage (I
n LDO quiescent supply current
n LDO shutdown supply current
n LDO PSRR
n LDO turn-on time
n LDO ouput noise-voltage
Features
n Stereo BTL amplifier
n Adjustable output voltage magnitude limiter
n Adjustable LDO regulator
n “Click and pop” suppression circuitry
n LDO is stable with small-value ceramic output capacitors
n Unity-gain stable audio amplifiers
n LDO has over-current protection
n Thermal shutdown protection circuitry
n TSSOP (MH) package
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable televisions
O
(BTL): V
20078129
DD
= 5V, THD+N ≤ 1%, R
OUT
= 300mA)
L
= 8Ω
February 2006
37µV
www.national.com
300mA (min)
3.0V to 5.5V
2.5V to 6.0V
120mV (typ)
0.07µA (typ)
120ms (typ)
90µA (typ)
1.0W(typ)
1nA (typ)
RMS
60dB
(typ)

Related parts for LM4817MH

LM4817MH Summary of contents

Page 1

... LDO has over-current protection n Thermal shutdown protection circuitry n TSSOP (MH) package Applications n Multimedia monitors n Portable and desktop computers n Portable televisions 20078129 Top View Order Number LM4817MH See NS Package Number MXA28A for TSSOP DS200781 February 2006 = 5V, THD+N ≤ 1 8Ω 1.0W(typ 3.0V to 5.5V 2.5V to 6.0V 0.07µ ...

Page 2

Typical Application www.national.com 2 20078101 ...

Page 3

... Absolute Maximum Ratings Stereo Amplifier (Notes Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Amplifier Supply Voltage (pins 5, 24) LDO-V , LDO-OUT, LDO-SHDN, CC ADJ, CC, FAULT (pins 11-15, 17,19) Fault Sink Current Storage Temperature ...

Page 4

LDO Electrical Characteristics Unless otherwise specified, all limits guaranteed for 25˚C. Boldface limits apply for the operating temperature extremes: −40˚C and 85˚C. J Symbol Parameter V Input Voltage IN ∆V Output Voltage Tolerance O V Output Adjust ...

Page 5

Stereo Amplifier Typical Performance Characteristics THD+N vs Frequency 8Ω OUT THD+N vs Frequency V = 5.5V 8Ω OUT THD+N vs Output Power ...

Page 6

Stereo Amplifier Typical Performance Characteristics Output Power vs Supply Voltage R = 8Ω 1kHz, at (from top to bottom at 4.5V THD+N = 10%, THD Power Dissipation vs Load Dissipation V = 5V, f ...

Page 7

Stereo Amplifier Typical Performance Characteristics Cross Talk 8Ω 150mW, at (from top to bottom DD L OUT at 2kHz): -IN A driven, V measured; OUTB -IN B driven, V measured OUTA PSRR vs ...

Page 8

Stereo Amplifier Typical Performance Characteristics Open Loop Frequency Response THD+N vs Output Power 8Ω (from left to right at 7% THD+N 2V, 1.9V, 1.8V, 1.7V, 1.6V, 1.5V, 1.0V, 0.5V, ...

Page 9

LDO Typical Performance Characteristics C = 2.2µ 33nF 25˚C, V OUT CC J Dropout Voltage vs Load Current (For Different Output Voltages) FAULT Detect Threshold vs Load Current Supply Current vs Load Current Unless otherwise specified, ...

Page 10

LDO Typical Performance Characteristics C = 2.2µ 33nF 25˚C, V OUT CC J Output Noise Spectral Density Output Impedance vs Frequency Load Transient www.national.com Unless otherwise specified (Continued) SHDN IN Output Noise ...

Page 11

LDO Typical Performance Characteristics C = 2.2µ 33nF 25˚C, V OUT CC J Power-Up Response External Components Description (Refer to Figure 1 ). Components 1. R The Inverting input resistance, along with R i filter with ...

Page 12

Application Information BRIDGE CONFIGURATION EXPLANATION * Refer to the section Proper Selection of External Components, for a detailed discussion of C FIGURE 1. Typical Audio Amplifier Application Circuit Pin out shown for the LLP package. Refer to the Connection Diagrams ...

Page 13

Application Information The LM4817 has two operational amplifiers per channel. The maximum internal power dissipation per channel operating in the bridge mode is four times that of a single-ended ampli- fier. From Equation (3), assuming a 5V power supply and ...

Page 14

Application Information SELECTING PROPER EXTERNAL COMPONENTS Optimizing the LM4817’s performance requires properly se- lecting external components. Though the LM4817 operates well when using external components with wide tolerances, best performance is achieved by optimizing component val- ues. The LM4817 is ...

Page 15

Application Information AUDIO POWER AMPLIFIER DESIGN Audio Amplifier Design: Driving 1W into an 8Ω Load The following are the desired operational parameters: Power Output: Load Impedance: Input Level: Input Impedance: Bandwidth: 100Hz−20 kHz The design begins by specifying the minimum ...

Page 16

Application Information type of regulator can be represented amp config- ured as non-inverting amplifier and a fixed DC Voltage (V ) for its input signal. The special characteristic of this REF op amp is its extra-large output ...

Page 17

Application Information the error amplifier. The second term expresses the zero (numerator) and pole (denominator) of the load in combina- tion with the R of the regulator. O Figure 5 shows a Bode plot that represents a case where the ...

Page 18

Application Information Power Dissipation Power dissipation refers to the part’s ability to radiate heat away from the silicon, with packaging being a key factor. A reasonable analogy is the packaging a human being might wear, a jacket for example. A ...

Page 19

Application Information FIGURE 7. Minimum Battery Detector that Disconnects the Load Via the SHDN Pin of the LM4817 Resistor value for V and V are determined as follows (The application of Figure 6 used The ...

Page 20

Application Information FIGURE 10. Recommended MH board layout: bottom-side layout Revision History Rev Date 1.0 2/08/06 www.national.com (Continued) 20078148 Description Changed the Limit (from 3 Entire IC) table, then re-released D/S to the WEB. 20 (Stereo ...

Page 21

... Tel: 1-800-272-9959 Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Order Number LM4817MH NS Package Number MXA28A 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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