LM48312TLX/NOPB National Semiconductor, LM48312TLX/NOPB Datasheet

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LM48312TLX/NOPB

Manufacturer Part Number
LM48312TLX/NOPB
Description
IC AMP AUD PWR 2.6W MONO D 9USMD
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class Dr
Datasheet
1.LM48312TLXNOPB.pdf (20 pages)

Specifications of LM48312TLX/NOPB

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
2.6W x 1 @ 4 Ohm
Voltage - Supply
2.4 V ~ 5.5 V
Features
Depop, Differential Inputs, E²S, Short-Circuit Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
9-MicroSMD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2010 National Semiconductor Corporation
2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power
Amplifier with E
General Description
The LM48312 is a single supply, high efficiency, mono, 2.6W,
filterless switching audio amplifier. The LM48312 features
National’s Enhanced Emissions Suppression (E
that features a unique patented ultra low EMI, spread spec-
trum, PWM architecture, that significantly reduces RF emis-
sions while preserving audio quality and efficiency. The E
system improves battery life, reduces external component
count, board area consumption, and system cost, simplifying
design.
The LM48312 is designed to meet the demands of portable
multimedia devices. Operating from a single 5V supply, the
device is capable of delivering 2.6W of continuous output
power to a 4Ω load with less than 10% THD+N. Flexible power
supply requirements allow operation from 2.4V to 5.5V. The
LM48312 features both a spread spectrum modulation
scheme, and an advanced, patented edge rate control (ERC)
architecture that significantly reduces emissions, while main-
taining high quality audio reproduction (THD+N = 0.03%) and
high efficiency (η = 88%).
The LM48312 features high efficiency compared to conven-
tional Class AB amplifiers, and other low EMI Class D ampli-
fiers. When driving an 8Ω speaker from a 5V supply, the
device operates with 88% efficiency at P
LM48312 features five gain settings, selected through a sin-
gle logic input, further reducing solution size. A low power
shutdown mode reduces supply current consumption to
0.01µA.
Advanced output short circuit protection with auto-recovery
prevents the device from being damaged during fault condi-
tions. Superior click and pop suppression eliminates audible
transients on power-up/down and during shutdown.
Boomer® is a registered trademark of National Semiconductor Corporation.
2
S
301107
O
= 1W. The
2
S) system,
LM48312
2
S
■ 
■ 
■ 
■ 
■ 
■ 
Key Specifications
Features
■
■
■
■
■
■
■
■
■
■
Applications
■
■
■
Efficiency at 3.6V, 400mW into 8Ω
Efficiency at 5V, 1W into 8Ω
Quiescent Power Supply Current at 5V
Power Output at V
Power Output at V
Shutdown current
Passes FCC Class B Radiated Emissions with 20 inches
of cable
E
and Efficiency
Output Short Circuit Protection with Auto-Recovery
No output filter required
Improved Audio Quality
Minimum external components
Five Logic Selectable Gain Settings (0, 3, 6, 9, 12dB)
Low Power Shutdown Mode
Click and Pop suppression
Available in space-saving microSMD package
Mobile phones
PDAs
Laptops
THD+N
THD+N
THD+N
THD+N
2
S System Reduces EMI while Preserving Audio Quality
 
≤
≤
≤
≤
10%
1%
10%
1%
DD
DD
= 5V, R
= 5V, R
L
L
= 4Ω
= 8Ω
www.national.com
May 13, 2010
0.01μA (typ)
2.6W (typ)
2.1W (typ)
1.6W (typ)
1.3W (typ)
84% (typ)
88% (typ)
3.1mA

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LM48312TLX/NOPB Summary of contents

Page 1

... Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault condi- tions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Boomer® registered trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation LM48312 S Key Specifications ■ ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 30110731 ...

Page 3

Connection Diagrams TL Package 1.539mm x 1.565mm x 0.6mm Top View Order Number LM48312TLE See NS Package Number TLA09BCA Ordering Information Order Number Package LM48312TLE 9 Bump micro SMD LM48312TLX 9 Bump micro SMD Pin Descriptions Pin Name A1 IN+ ...

Page 4

... Absolute Maximum Ratings 2) 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 3) ESD Rating (Note 4) ESD Rating (Note 5) Electrical Characteristics V The following specifications apply for A ...

Page 5

Symbol Parameter P Output Power O THD+N Total Harmonic Distortion + Noise PSRR Power Supply Rejection Ratio CMRR Common Mode Rejection Ratio η Efficiency SNR Signal to Noise Ratio CMVR Common Mode Input Voltage Range ε Output Noise OS Conditions ...

Page 6

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at theAbsolute Maximum Ratings or other conditions beyond those ...

Page 7

Typical Performance Characteristics For all performance graphs, the Output Gains are set to 0dB, unless otherwise noted. THD+N vs Frequency V = 2.5V 180mW THD+N vs Frequency 600mW ...

Page 8

THD+N vs Frequency THD+N vs Output Power A = 3dB 1kHz THD+N vs Output Power A = 9dB 1kHz www.national.com = 3Ω L ...

Page 9

THD+N vs Output Power = 4Ω 0dB 1kHz 30110738 THD+N vs Output Power = 4Ω 6dB 1kHz 30110775 THD+N vs Output Power = 4Ω ...

Page 10

THD+N vs Output Power A = 3dB 1kHz THD+N vs Output Power A = 9dB 1kHz Efficiency vs Output Power f = 1kHz www.national.com = 3Ω L 30110744 = 3Ω ...

Page 11

Power Dissipation vs Output Power = 4Ω 1kHz 30110757 Output Power vs Supply Voltage = 4Ω 1kHz 30110759 PSRR vs Frequency = 8Ω 5V 200mV , R DD ...

Page 12

Spread Spectrum Output Spectrum vs Frequency RMS Supply Current vs Supply Voltage No Load www.national.com Wideband Spread Spectrum Output Spectrum = 8Ω 30110764 Shutdown Supply Current vs Supply Voltage ...

Page 13

Application Information GENERAL AMPLIFIER FUNCTION The LM48312 mono Class D audio power amplifier features a filterless modulation scheme that reduces external compo- nent count, conserving board space and reducing system cost. The outputs of the device transition from V with ...

Page 14

Audio Amplifier Input Capacitor Selection Input capacitors may be required for some applications, or when the audio source is single-ended. Input capacitors block the DC component of the audio signal, eliminating any conflict between the DC component of the audio ...

Page 15

Demo Board Schematic FIGURE 5: LM48312 Demoboard Schematic 15 30110768 www.national.com ...

Page 16

LM48312TL Demoboard Bill of Materials Designator Quantity C3 R1 LM48312TL 1 www.national.com 10µF ±10% 16V Tantalum Capacitor (B Case) AVX TPSB106K016R0800 1µF ±10% 16V X5R Ceramic Capacitor (603) Panasonic ECJ-1VB1C105K 1µF ±10% ...

Page 17

PC Board Layout Top Silkscreen Layer 2 (GND) Bottom Layer 30110769 Top Layer 30110771 Layer 3 (V 30110773 Bottom Silkscreen 17 30110770 30110772 ) DD 30110774 www.national.com ...

Page 18

Revision History Rev 1.0 1.01 1.02 www.national.com Date 01/20/10 Initial WEB released. 03/19/10 Text edits under the ENHANCED EMISSIONS section. 05/13/10 Edited Table 2. 18 Description ...

Page 19

Physical Dimensions inches (millimeters) unless otherwise noted X1 = 1.532±0.03mm X2 = 1.556±0.03mm X3 = 0.6±0.075mm 9 Bump micro SMD Order Number LM48312TLE NS Package Number TLA09BCA 19 www.national.com ...

Page 20

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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