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LM48512 Datasheet Preview

LM48512 Datasheet

Audio Power Amplifier

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LM48512
www.ti.com
SNAS497A – OCTOBER 2010 – REVISED APRIL 2012
LM48512 Boomer® Audio Power Amplifier Series PowerWise® Boosted, Ultra Low-EMI,
Mono, E2S Class D Audio Power Amplifier
Check for Samples: LM48512
FEATURES
1
2 E2S System Reduces EMI while Preserving
Audio Quality and Efficiency
• Integrated Boost Converter
• Supply Voltage Level Detection on Boost
Converter
• Low Power Shutdown Mode
• "Click and Pop" suppression
APPLICATIONS
• Mobile phones
• Smart phones
• PDAs
DESCRIPTION
Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8, while consuming 14.5mA
of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E2S) system, a
patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality
and efficiency. LM48512 improves battery life, reduces external component count, board area consumption,
system cost, and simplifies design.
The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high
efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of
driving an 8speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power
supply requirements allow operation from 2.3V to 5.5V. The E2S system features a patented edge rate control
(ERC) architecture that further reduces emissions by minimizing the high frequency component of the device
output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power
shutdown mode reduces supply current consumption to 0.04μA.
The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and
reduces the gain of the amplifier to limit the output as the battery voltage decreases.
Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
Power Output at VDD = 3.6V
RL = 8, THD+N 1%
Efficiency at 3.6V, 800mW into 8
Quiescent Power Supply Current
at 3.6V
Shutdown current
Table 1. Key Specifications
VALUE
1.8
82% (typ)
14.5mA
0.04μA (typ)
UNIT
W (typ)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2012, Texas Instruments Incorporated




etcTI

LM48512 Datasheet Preview

LM48512 Datasheet

Audio Power Amplifier

No Preview Available !

LM48512
SNAS497A – OCTOBER 2010 – REVISED APRIL 2012
Typical Application
SDREG
SDAMP
CIN = 0.1 PF
IN+
CIN = 0.1 PF
IN-
GAIN
+2.3V to +5.5V
L1
CS
10 PF
VDD
SW
BOOST
CONVERTER
PVOUT
CS
RTRIP
RTRIP
22 PF
GAIN
STAGE
OSCILLATOR
MODULATOR
PVDD
H-BRIDGE
OUTA
OUTB
CS = 0.1 PF
GND
PGND
Figure 1. Typical Audio Amplifier Application Circuit
Connection Diagram
TL Package
2.098mm x 2.098mm x 0.6mm
1
2
3
4
A
PVDD
PVOUT
SW
PGND
B
OUTA
GAIN
RTRIP
VDD
C
OUTB
PGND
SDAMP
GND
D
PGND
IN+
IN-
SDREG
www.ti.com
Figure 2. Top View
Order Number LM48512TL
See NS Package Number TLA16QSA
2
Submit Documentation Feedback
Product Folder Links: LM48512
Copyright © 2010–2012, Texas Instruments Incorporated



Part Number LM48512
Description Audio Power Amplifier
Maker etcTI
Total Page 3 Pages
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LM48512 Datasheet PDF





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