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PDF LM4953 Data sheet ( Hoja de datos )
| Número de pieza | LM4953 | |
| Descripción | Ground-Referenced Ultra Low Noise / Ceramic Speaker Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 2005
www.DataSheet4U.com
LM4953
Ground-Referenced, Ultra Low Noise, Ceramic Speaker
Driver
General Description
The LM4953 is an audio power amplifier designed for driving
Ceramic Speaker in portable applications. When powered by
a 3.6V supply, it is capable of forcing 12.6Vpp across a 2µF
+ 30Ω bridge-tied-load (BTL) with less than 1% THD+N.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4953 does not require boot-
strap capacitors, or snubber circuits. Therefore it is ideally
suited for display applications requiring high power and mini-
mal size.
The LM4953 features a low-power consumption shutdown
mode. Additionally, the LM4953 features an internal thermal
shutdown protection mechanism.
The LM4953 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4953 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Quiescent Power Supply Current (Vdd = 3V) 7mA(typ)
j BTL Voltage Swing
(2µF+30Ω load, 1% THD+N,
Vdd = 3.6V)
12.6Vpp (typ)
j Shutdown Current
1µA (max)
Features
n Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n Low, 1µA (max) shutdown current
n Low, 7mA (typ) quiescent current
n 12.6Vpp mono BTL output, load = 2µF+ 30Ω
n Thermal shutdown
n Unity-gain stable
n External gain configuration capability
Applications
n Cellphone
n PDA
Typical Application
FIGURE 1. Typical Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201421
20142168
www.national.com
1 page  
Typical Performance Characteristics
THD+N vs Frequency
VDD = 2V, VO = 2Vpp, ZL = 2µF+30Ω
www.DataSheet4U.com
THD+N vs Frequency
VDD = 3V, VO = 6Vpp, ZL = 2µF+30Ω
20142112
THD+N vs Frequency
VDD = 3.6V, VO = 8.5Vpp, ZL = 2µF+30Ω
20142113
THD+N vs Frequency
VDD = 4.2V, VO = 10Vpp, ZL = 2µF+30Ω
20142114
THD+N vs Output Voltage
VDD = 2V, f = 1kHz, ZL = 2µF+30Ω
20142118
THD+N vs Output Voltage
VDD = 3V, f = 1kHz, ZL = 2µF+30Ω
20142119
5
20142121
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
www.DataSheet4U.com
LLP Package
Order Number LM4953SD
NS Package Number SDA14A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
Leadfree products are RoHS compliant.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: [email protected]
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM4953.PDF ] | |
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