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LM4879IBL Datasheet

  • LM4879IBL

  • AUDIO AMPLIFIER|SINGLE|BGA|9PIN|PLASTIC

  • 23頁

  • ETC

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LM4879 1.1 Watt Audio Power Amplifier
November 2001
LM4879
1.1 Watt Audio Power Amplifier
General Description
The LM4879 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 1.1 watt of continuous average power to an 8鈩?/div>
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 LM4879 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for lower-power portable applications where
minimal space and power consumption are primary require-
ments.
The LM4879 features a low-power consumption global shut-
down mode, which is achieved by driving the shutdown pin
with logic low. Additionally, the LM4879 features an internal
thermal shutdown protection mechanism.
The LM4879 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4879 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
PSRR at 5V, 3V, & 217Hz
j
Power Output at 5V & 1% THD
j
Power Output at 3V & 1% THD
j
Shutdown Current
62dB (typ)
1.1W (typ)
350mW (typ)
0.1碌A (typ)
Features
n
No output coupling capacitors, snubber networks or
bootstrap capacitors required
n
Unity gain stable
n
Ultra low current shutdown mode
n
Fast turn on: 80mS (typ), 110mS (max) with 1.0碌F
capacitor
n
BTL output can drive capacitive loads up to 100pF
n
Advanced pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n
2.2V - 5.0V operation
n
Available in space-saving 碌SMD and MSOP packages
Applications
n
Mobile Phones
n
PDAs
n
Portable electronic devices
Typical Application
DS200243-1
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2001 National Semiconductor Corporation
DS200243
www.national.com

LM4879IBL 產品屬性

  • 1

  • 集成電路 (IC)

  • 線性 - 音頻放大器

  • Boomer®

  • AB 類

  • 1-通道（單聲道）

  • 1.1W x 1 @ 8 歐姆

  • 2.2 V ~ 5.5 V

  • 消除爆音，關機，熱保護

  • 表面貼裝

  • 9-uSMD

  • 9-VFBGA

  • 剪切帶 (CT)

  • *LM4879IBLLM4879IBLCT

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