LM48820TMBD National Semiconductor, LM48820TMBD Datasheet

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LM48820TMBD

Manufacturer Part Number
LM48820TMBD
Description
BOARD EVAL GROUND REF AUDIO AMP
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM48820TMBD

Amplifier Type
Class AB
Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
95mW x 2 @ 16 Ohm
Voltage - Supply
1.6 V ~ 4.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM48820
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2007 National Semiconductor Corporation
LM48820
Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW
Stereo Headphone Amplifier
General Description
The LM48820 is a ground referenced, fixed-gain audio power
amplifier capable of delivering 95mW of continuous average
power into a 16Ω single-ended load, with less than 1% THD
+N from a 3V power supply.
The LM48820 features a new circuit technology that utilizes
a charge pump to generate a negative reference voltage. This
allows the outputs to be biased about ground, thereby elimi-
nating output-coupling capacitors typically used with normal
single-ended loads.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal number of
external components. The LM48820 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other portable applica-
tions.
The LM48820 features a low-power consumption shutdown
mode selectable for each channel and a soft start function that
reduces start-up current transients. Additionally, the
LM48820 features an internal thermal shutdown protection
mechanism.
The LM48820 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during turn-on
and turn-off transitions.
The LM48820 has an internal fixed gain of 1.5V/V.
Boomer
®
is a registered trademark of National Semiconductor Corporation.
202023
Key Specifications
Features
Applications
■ 
■ 
■ 
■ 
■ 
Available in space saving 0.4mm pitch micro SMD
package
Fixed Logic Levels
Ground referenced outputs
High PSRR
Ultra low current shutdown mode
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
No output coupling capacitors, snubber networks,
bootstrap capacitors, or gain-setting resistors required
Shutdown either channel independently
Soft start feature reduces start up transient current
Mobile Phones
MP3 Players
PDAs
Portable electronic devices
Notebook PCs
Improved PSRR at 217Hz
Power Output at V
Shutdown Current
Internal Fixed Gain
Wide Operating Voltage Range
R
L
= 16Ω, THD+N = 1%
DD
= 3V,
www.national.com
0.05µA (typ)
1.6V to 4.5V
1.5V/V (typ)
95mW (typ)
80dB (typ)
June 2007

Related parts for LM48820TMBD

LM48820TMBD Summary of contents

Page 1

... The LM48820 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM48820 has an internal fixed gain of 1.5V/V. Boomer ® registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation Key Specifications ■  Improved PSRR at 217Hz ■  ...

Page 2

Typical Application www.national.com FIGURE 1. Typical Audio Amplifier Application Circuit 2 202023b8 ...

Page 3

Connection Diagrams micro SMD Package Top View Order Number LM48820TM See NS Package Number TME14AAA 14 – Bump TM Marking Top View XY – Date Code TT – Lot Traceability G – Boomer Family I7 – LM48820TM 20202309 TME14 Package ...

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Pin Descriptions Pin www.national.com Name R Right Channel Input IN SGND Signal Ground CPV Charge Pump Power Supply DD C Positive Terminal - Charge Pump Flying ...

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) Electrical Characteristics V The following specifications apply for V cuit” ...

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Symbol Parameter Z Output Impedance OUT I Input Leakage L Note 1: All voltages are measured with respect to the GND pin unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. ...

Page 7

Typical Performance Characteristics THD+N vs Frequency = 16Ω, Stereo 1.6V THD+N vs Frequency = 16Ω, Stereo 3V THD+N vs Frequency = 16Ω, One channel 3V, ...

Page 8

THD+N vs Output Power = 16Ω, One channel V = 1.6V THD+N vs Output Power = 16Ω, Stereo V = 1.6V THD+N vs Output Power = 16Ω, One channel ...

Page 9

THD+N vs Output Power = 16Ω, Stereo 20202327 Output Power vs Power Supply Voltage = 16Ω 1kHz, Mono R L 20202371 Output Power vs Power Supply Voltage = 32Ω 1kHz, ...

Page 10

Power Dissipation vs Output Power = 16Ω 1kHz V = 1.6V Power Dissipation vs Output Power = 16Ω 1kHz PSRR vs Frequency V = 1.6V ...

Page 11

PSRR vs Frequency = 16Ω 3V Power Supply Current vs Power Supply Voltage V = 0V, Mono IN PSRR vs Frequency V 20202367 Power Supply Current vs Power Supply Voltage 20202376 11 = 32Ω = ...

Page 12

Application Information SUPPLY VOLTAGE SEQUENCING Before applying any signal to the inputs or shutdown pins of the LM48820 important to apply a supply voltage to the V pins. After the device has been powered, signals may be DD ...

Page 13

Charge Pump Capacitor Selection Use low (<100mΩ) ESR (equivalent series resistance) ce- ramic capacitors with an X7R dielectric for best performance. Low ESR capacitors keep the charge pump output impedance to a minimum, extending the headroom on the negative supply. ...

Page 14

Revision History Rev Date 1.0 05/09/07 1.1 05/15/07 1.2 06/25/07 www.national.com Description Initial release. Added the BOM table. Deleted and replaced some curves. Input text edits also. 14 ...

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Physical Dimensions inches (millimeters) unless otherwise noted 1.615±0.03mm 0.600±0.075mm, 14 – Bump micro SMD Order Number LM48820TM NS Package Number TME14AAA 15 www.national.com ...

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... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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