LM4925SD

更新时间： 2024-02-09 09:00:05

品牌	Logo	应用领域
美国国家半导体 - NSC		音频放大器
页数	文件大小	规格书
15页	1043K
描述
2 Cell, Single Ended Output, 40mW Stereo Headphone Audio Amplifier

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LM4925SD 数据手册

February 2005

LM4925

2 Cell, Single Ended Output, 40mW Stereo Headphone

Audio Amplifier

General Description

Key Specifications

n Mono-BTL Output Power

The unity gain stable LM4925 is both a mono differential

output (for BTL operation) audio amplifier and a Single

Ended (SE) stereo headphone amplifier. Operating on a

single 3V supply, the mono-BTL mode delivers 410mW into

an 8Ω load at 1% THD+N. In Single Ended stereo head-

phone mode, the amplifier delivers 40mW per channel into a

16Ω load at 1% THD+N.

(R_L= 8Ω, V_DD= 3.0V, THD+N = 1%)

n Single Ended Output Power Per Channel

(R_L= 16Ω, V_DD= 3.0V, THD+N = 1%)

410mW (typ)

40mW (typ)

0.1µA (typ)

n Micropower shutdown current

n Supply voltage operating range

n PSRR 100Hz, V_DD= 3V, BTL

1.5V V_DD3.6V

70dB (typ)

With the LM4925 packaged in the MM and LLP packages,

the customer benefits include low profile and small size. This

package minimizes PCB area and maximizes output power.

Features

n BTL mode for mono speaker

n 2-cell 1.5V to 3.6V battery operation

The LM4925 features circuitry that reduces output transients

(“clicks” and “pops”) during device turn-on and turn-off, an

externally controlled, low-power consumption, active-low

shutdown mode, and thermal shutdown. Boomer audio

power amplifiers are designed specifically to use few exter-

nal components and provide high quality output power in a

surface mount package.

n Single ended headphone operation with output coupling

capacitors

n Unity-gain stable

n “Click and pop” suppression circuitry for both Shutdown

and Mute

n Active low micro-power shutdown

n Active-low mute mode

n Thermal shutdown protection circuitry

Applications

n Portable two-cell audio products

n Portable two-cell electronic devices

Typical Application

20121157

FIGURE 1. Block Diagram

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS201211

www.national.com

12 3 4 5 6 7...15

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