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參數資料
| 型號： | LM4891 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1 Watt Audio Power Amplifier |
| 中文描述： | 1瓦音頻功率放大器 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 733K |
| 代理商： | LM4891 |
LM4891
1 Watt Audio Power Amplifier
General Description
The LM4891 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other por-
table communication device applications. It is capable of
delivering 1 watt of continuous average power to an 8
BTL
load with less than 1% distortion (THD+N) from a 5V
DC
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4891 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4891 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic high.Additionally, the LM4891 features an internal ther-
mal shutdown protection mechanism.
The LM4891 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4891 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
PSRR at 217Hz, V
DD
= 5V, 8
Load
j
Power Output at 5.0V & 1% THD
j
Power Output at 3.3V & 1% THD
j
Shutdown Current
62dB (typ)
1.0W (typ)
400mW (typ)
0.1μA (typ)
Features
n
Available in space-saving packages: micro SMD, MSOP,
SOIC, and LLP
n
Ultra low current shutdown mode
n
BTL output can drive capacitive loads
n
Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
2.2 to 5.5V operation
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
Thermal shutdown protection
n
Unity-gain stable
n
External gain configuration capability
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer
is a registered trademark of National Semiconductor Corporation.
20007401
FIGURE 1. Typical Audio Amplifier Application Circuit
October 2002
L
2002 National Semiconductor Corporation
DS200074
www.national.com
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| LM4892LD | 1 Watt Audio Power Amplifier with Headphone Sense |
| LM4892M | 1 Watt Audio Power Amplifier with Headphone Sense |
| LM4892MM | 1 Watt Audio Power Amplifier with Headphone Sense |
| LM4892 | 1 Watt Audio Power Amplifier with Headphone Sense |
| LM4892IBP | 1 Watt Audio Power Amplifier with Headphone Sense |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM48910B WAF | 制造商:Texas Instruments 功能描述: |
| LM4891B E WAF | 制造商:Texas Instruments 功能描述: |
| LM4891IBP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1 Watt Audio Power Amplifier |
| LM4891IBP/NOPB | 功能描述:IC AMP AUDIO PWR 1W MONO 8USMD RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4891IBPX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1 Watt Audio Power Amplifier |
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