LM49151
LM49151 PRODUCT BRIEF Mono Class D Audio Subsystem with Earpiece
Driver,Ground Referenced Headphone Amplifiers, Speaker Protection and No
Clip with Clip Control
Literature Number: SNAS482D
LM49151
PRODUCT BRIEF
May 14, 2010
Mono Class D Audio Subsystem with Earpiece Driver,
Ground Referenced Headphone Amplifiers, Speaker
Protection and No Clip with Clip Control
General Description
The LM49151 is a fully integrated audio subsystem designed
for portable handheld applications such as cellular phones.
The LM49151 combines a 1.25W mono E2S class D amplifier,
125mW Class AB earpiece driver, 42mW/channel stereo
ground referenced headphone drivers, volume control, input
mixer/multiplexer, and speaker protection into a single de-
vice.
The LM49151 class D speaker amplifier features National’s
unique Automatic Level Control (ALC) that provides both a
I2C programmable no-clip feature with Clip Controls and
speaker protection. The E2S (Enhanced Emission Suppres-
sion) class D amplifier features a patented, ultra low EMI
PWM architecture that significantly reduces RF emissions
while preserving audio quality and efficiency while delivering
1.25W into an 8Ω load with <1% THD+N with a 5V supply.
The 42mW/channel headphone drivers feature National’s
ground referenced architecture that creates a ground-refer-
enced output from a single supply, eliminating the need for
bulky and expensive DC-blocking capacitors, saving space
and minimizing system cost.
The LM49151 features separate volume controls for the loud-
speaker and headphone inputs. Mode selection, shutdown
control, and volume are controlled through an I2C compatible
interface. The LM49151's superior click and pop suppression
eliminates audible transients on power-up/down and during
shutdown.
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html
Key Specifications
■ Output power at VDD = 3.3V
THD+N ≤ 1%
LS Mode, RL = 8Ω 520mW (typ)
HP Mode, RL = 32Ω 40mW (typ)
■ Output power at VDD = 5V
THD+N ≤ 1%
LS Mode, RL = 8Ω 1.25W (typ)
HP Mode, RL = 32Ω 42mW (typ)
■ Output Offset
LS Mode 15 6mV (typ)
HP Mode 15 2mV (typ)
Features
■E2S class D amplifier
■Ground referenced outputs — eliminates output coupling
capacitors
■I2C programmable No Clip Function with Clip Control
■Voltage limiter speaker protection
■I2C volume and mode Control
■Ear Piece Amplifier
■Advanced click-and-pop suppression
■Low supply current
■Micro-power shutdown
■20-bump micro SMD package
Applications
■Mobile Phones
■PDAs
■Notebook PCs
■Portable Electronics Devices
■MP3 Players
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation 300925 www.national.com
LM49151 PRODUCT BRIEF
Typical Application
30092576
FIGURE 1. Typical Audio Amplifier Application Circuit
www.national.com 2
LM49151
Connection Diagrams
20 Bump micro SMD Package
300925t4
Top View
Order Number LM49151TL
(See NS Package Number TLA20GDA)
Top Markings
300925t5
Top View
XY - Date Code
TT - Die Traceability
G- Boomer
L7 - LM49151TL
Ordering Information
Order Number Package Package DWG # Transport Media MSL Level Green Status
LM49151TL 20 Bump micro SMD TLA20GDA 250 units on tape and
reel 1RoHS and
no sB/Br
LM49151TLX 20 Bump micro SMD TLA20GDA 3000 units on tape and
reel 1RoHS and
no sB/Br
Bump Descriptions
Bump Name Description
A1 I2CVDD I2C Power Supply
A2 GND Ground
A3 LSOUT- Inverting Loudspeaker Output
A4 LSOUT+ Non-Inverting Loudspeaker Output
B1 VDD Analog Power Supply
B2 SDA I2C Data Input
B3 SCL I2C Clock Input
B4 LSVDD Loudspeaker Power Supply
C1 INL Left Channel Input
C2 INR Right Channel Input
C3 BYPASS Mid-Rail Supply Bypass
C4 CPVSS Charge Pump Output
D1 INM- Mono Channel Inverting Input
D2 SET ALC Timing Control
D3 CPN Charge Pump Flying Capacitor - Negative Terminal
D4 CPP Charge Pump Flying Capacitor - Positive Terminal
E1 INM+ Mono Channel Non-Inverting Input
E2 HPR Right Channel Headphone Amplifier Output
E3 HPL Left Channel Headphone Amplifier Output
E4 CPGND Charge Pump Ground
3 www.national.com
LM49151
Notes
LM49151 PRODUCT BRIEF
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