IC AMP AUDIO PWR 1.3W D 25USMD

LM48520TL/NOPB

Manufacturer Part NumberLM48520TL/NOPB
DescriptionIC AMP AUDIO PWR 1.3W D 25USMD
ManufacturerNational Semiconductor
SeriesBoomer®
TypeClass D
LM48520TL/NOPB datasheet
 


Specifications of LM48520TL/NOPB

Output Type2-Channel (Stereo)Max Output Power X Channels @ Load1.3W x 2 @ 8 Ohm
Voltage - Supply2.4 V ~ 5.5 VFeaturesDepop, Differential Inputs, Short-Circuit Protection, Shutdown
Mounting TypeSurface MountPackage / Case25-MicroSMD
Operational ClassClass-DAudio Amplifier Output Configuration2-Channel Stereo
Output Power (typ)1.3x2@8OhmWAudio Amplifier FunctionSpeaker
Total Harmonic Distortion0.04@8Ohm@500mW%Single Supply Voltage (typ)Not RequiredV
Dual Supply Voltage (typ)3/5VPower Supply RequirementTriple
Rail/rail I/o TypeNoPower Supply Rejection Ratio82dB
Single Supply Voltage (min)Not RequiredVSingle Supply Voltage (max)Not RequiredV
Dual Supply Voltage (min)2.4/2.7/3VDual Supply Voltage (max)5/5.5V
Operating Temp Range-40C to 85COperating Temperature ClassificationIndustrial
MountingSurface MountPin Count25
For Use WithLM48520TLBD - BOARD EVALUATION FOR LM48520TLLead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesLM48520TL
LM48520TL
LM48520TLTR
  
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LM48520
Boosted Stereo Class D Audio Power Amplifier with Output
Speaker Protection and Spread Spectrum
General Description
The LM48520 integrates a boost converter with a high effi-
ciency Class D stereo audio power amplifier to provide up to
1W/ch continuous power into an 8Ω speaker when operating
from 2.7V to 5.0V power supply with boost voltage (PV1) of
5.0V. The LM48520 utilizes a proprietary spread spectrum
pulse width modulation technique that lowers RF interference
and EMI levels. The Class D amplifier is a low noise, filterless
PWM architecture that eliminates the output filter, reducing
external component count, board area, power consumption,
system cost, and simplifying design.
The LM48520 is designed for use in mobile phones and other
portable communication devices. The high (78%) efficiency
extends battery life when compared to Boosted Class AB am-
plifiers. The LM48520 features a low-power consumption
shutdown mode. Shutdown may be enabled by driving the
Shutdown pin to a logic low (GND). Also, external leakage is
minimized via control of the ground reference via the SW-
OUT pin .
The LM48520 has 4 gain options which are pin selectable via
Gain0 and Gain1 pins. Output short circuit prevents the de-
vice from damage during fault conditions. Superior click and
pop suppression eliminates audible transients during power-
up and shutdown.
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation
Key Specifications
■ 
Quiescent Power Supply Current
■ 
Output Power
= 8Ω, THD+N
(R
L
V
= 3.3V,PV1 = 5.0V)
DD
■ 
Shutdown Current
Features
Click and Pop Suppression
Low 0.04μA Shutdown Current
78% Efficiency
Filterless Class D
2.7V - 5.0V operation
4 Adjustable Gain settings
Adjustable output swing limiter with Soft Clipping
Speaker Protection
Short circuit protection on Audio Amps
Independent Boost and Amplifier shutdown pins
Applications
Mobile Phones
PDAs
Portable media
Cameras
Handheld games
201987
March 20, 2008
11.5mA (typ)
1%,
1.1W (typ)
0.04μA (typ)
www.national.com

LM48520TL/NOPB Summary of contents

  • Page 1

    ... Gain0 and Gain1 pins. Output short circuit prevents the de- vice from damage during fault conditions. Superior click and pop suppression eliminates audible transients during power- up and shutdown. Boomer ® registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation Key Specifications ■  Quiescent Power Supply Current ■  ...

  • Page 2

    Typical Application FIGURE 1. Typical LM48520 Audio Amplifier Application Circuit www.national.com 2 20198701 ...

  • Page 3

    Connection Diagrams LM48520TL Top View Order Number LM48520TL See NS Package Number TLA25AAA Micro SMD Marking 20198721 Top View X — Date Code T — Die Traceability G — Boomer Family I5 — LM48520TL 3 20198702 www.national.com ...

  • Page 4

    Pin Descriptions Pin Designator Pin Name A1 VDD A2 BstFB A3 Soft Start A4 SW_GND INR+ B2 INR- B3 FB_GND B4 INL- B5 INL BstSD C3 GND C4 Gain0 C5 PV1 D1 AmpSD D2 ...

  • Page 5

    ... 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 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V The following specifications apply for V apply for T = 25° ...

  • Page 6

    Symbol Parameter PSRR Power Supply Rejection Ratio CMRR Common Mode Rejection Ratio η Efficiency V Feedback Pin Reference Voltage FB Output Voltage in clipped state with V out clipped soft clip activated Note 1: All voltages are measured with respect ...

  • Page 7

    Typical Performance Characteristics THD+N vs Frequency V = 2.7V 800mW OUT THD+N vs Frequency V = 5.0V 1W OUT THD+N vs Output Power = 8Ω 3.3V ...

  • Page 8

    Power Dissipation vs Output Power = 8Ω 1kHz V = 2.7V Power Dissipation vs Output Power = 8Ω 1kHz V = 5.0V Efficiency vs Output Power = 8Ω ...

  • Page 9

    CMRR vs Frequency = 8Ω V =3.3V RIPPLE P-P L Supply Current vs Supply Voltage No Load 20198724 Boost Output Voltage vs Load Current V = 2.7V DD PSRR vs Frequency V =3.3V, V ...

  • Page 10

    Boost Output Voltage vs Load Current V = 5.0V DD www.national.com 20198728 10 ...

  • Page 11

    Application Information GENERAL AMPLIFIER FUNCTION The LM48520 features a Class D audio power amplifier that utilizes a filterless modulation scheme, reducing external component count, conserving board space and reducing sys- tem cost. The outputs of the device transition from PV1 ...

  • Page 12

    Capacitors with high-voltage coefficients, such as ceramics, may result in increased distortion at low frequen- cies. Other factors to consider when designing the input filter include the constraints of the overall ...

  • Page 13

    (AVG DC) LOAD IND Where "DC" is the duty cycle of the application. The switch current can be found by (AVG IND RIPPLE Inductor ripple current is ...

  • Page 14

    Output Speaker Protection Function The LM48520’s output voltage limiter can be used to set a minimum and maximum output voltage swing magnitude. The voltage applied to the VLimit pin controls the limit on the out- put voltage level. The output ...

  • Page 15

    Revision History Rev Date 1.0 02/27/08 1.01 03/07/08 1.02 03/12/08 Description Initial release. Added the Soft clipping vs No clipping curve. Text edits. 15 www.national.com ...

  • Page 16

    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted micro SMD Package Order Number LM48520TL NS Package Number TLA25AAA X1 = 2.49mm 2.49mm 0.6mm, 16 ...

  • Page 17

    Notes 17 www.national.com ...

  • Page 18

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