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PDF LM4877 Data sheet ( Hoja de datos )
| Número de pieza | LM4877 | |
| Descripción | 1 Watt Audio Power Amplifier in micro SMD package with Shutdown Logic Low | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 2000
LM4877
1 Watt Audio Power Amplifier in micro SMD package
with Shutdown Logic Low
General Description
The LM4877 is a bridge-connected audio power amplifier ca-
pable of delivering 1 W of continuous average power to an
8Ω load with less than .2% (THD) from a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4877 does not require
output coupling capacitors or bootstrap capacitors. It is opti-
mally suited for low-power portable applications.
The LM4877 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable LM4877 can be configured by external
gain-setting resistors.
Key Specifications
n Power Output at 0.2% THD
n Shutdown Current
1 W (typ)
0.01 µA (typ)
Features
n micro SMD package (see App. note AN-1112)
n 5V - 2V operation
n No output coupling capacitors or bootstrap capacitors.
n Unity-gain stable
n External gain configuration capability
Applications
n Cellular Phones
n Portable Computers
n Low Voltage Audio Systems
Typical Application
Connection Diagram
8 Bump micro SMD
DS101290-23
Top View
Order Number LM4877IBP, LM4877IBPX
See NS Package Number BPA08B6B
DS101290-1
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101290
www.national.com
1 page  
Typical Performance Characteristics (Continued)
THD+N vs
Output Power
2.6V at 8Ω
THD+N vs
Output Power
2.6V at 4Ω
Output Power vs
Supply Voltage
DS101290-9
Output Power vs
Load Resistance
DS101290-10
Power Derating Curve
DS101290-11
Power Dissipation vs
Output Power
VDD = 5V
DS101290-12
DS101290-14
5
DS101290-26
www.national.com
5 Page 
Application Information (Continued)
DIFFERENTIAL AMPLIFIER CONFIGURATION FOR
LM4877
Figure 3
DS101290-29
Mono LM4877 Reference Design Board - Assembly Part Number:
980011207-100 Revision: A Bill of Material
Item
Part Number
Part Description
Qty Ref Designator
1 551011208-001 LM4877 Mono Reference
1
Design Board PCB etch 001
10 482911183-001 LM4877 Audio AMP micro
SMD 8 Bumps
1
U1
20
151911207-001
Cer Cap 0.1uF 50V +80/-20
1206
1
C1
21
151911207-002
Cer Cap 0.39uF 50V Z5U 20
1
1210
C2
25 152911207-001
Tant Cap 1uF 16V 10
Size=A 3216
1
C3
30 472911207-001
Res 20K Ohm 1/10W 5
0805
3 R1, R2, R3
31 472911207-002
Res 1K Ohm 1/10W 5
0805
2
R4, R5,
35 210007039-002
Jumper Header Vertical
Mount 2X1 0.100
3
J1, J2, J3
36 210007582-001
Jumper Shunt 2 position
0.100
3
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM4877.PDF ] | |
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