AK7844

更新时间： 2024-02-11 18:38:22

品牌	Logo	应用领域
AKM		消费电路商用集成电路音频放大器视频放大器
页数	文件大小	规格书
21页	419K
描述
Stereo Audio Class-D Amp with Power Booster for Piezo Speakers

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技术参数
数据手册

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AK7844 技术参数

生命周期：	Obsolete	零件包装代码：	BGA
包装说明：	3 X 3 MM, 0.50 MM PITCH, WLCSP-31	针数：	31
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.33.00.01	风险等级：	5.84
标称带宽：	20 kHz	商用集成电路类型：	AUDIO AMPLIFIER
JESD-30 代码：	S-PBGA-B31	JESD-609代码：	e1
长度：	2.96 mm	信道数量：	2
功能数量：	1	端子数量：	31
最高工作温度：	85 °C	最低工作温度：	-30 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	VFBGA
封装形状：	SQUARE	封装形式：	GRID ARRAY, VERY THIN PROFILE, FINE PITCH
认证状态：	Not Qualified	座面最大高度：	0.92 mm
最大供电电压 (Vsup)：	4.5 V	最小供电电压 (Vsup)：	2.7 V
表面贴装：	YES	温度等级：	OTHER
端子面层：	TIN SILVER COPPER	端子形式：	BALL
端子节距：	0.5 mm	端子位置：	BOTTOM
宽度：	2.96 mm	Base Number Matches：	1

AK7844 数据手册

AKEMD

AKEMD CONFIDENTIAL

[AK7844]

AK7844

Stereo Audio Class-D Amp with Power Booster for Piezo Speakers

GENERAL DESCRIPTION

THE AK7844 is Stereo Class-D amplifier for driving Piezo-Electric Speakers. Built-in Boost DCDC converter

generates adequate high voltage for driving Piezo Speakers from Li-Ion battery.

AKM state-of-the-art filter-less solution eliminates LC-filters, which are normally required at Class-D outputs.

That contributes to total space saving.

Class-D operation ensures higher power efficiency, and couple with Piezo Speaker that is low-power-

consumption and low-profile figure. The AK7844 is very applicable for cellular phones with piezo speakers.

FEATURES

□Class-D Amplifier ：

• Piezo-Electric Speaker Driver

• Single-ended analog Input

• BTL output

• Output voltage = 8Vrms @VDD1=8.75V

• Filter-less solution

• Stereo mode

• Pop noise suppressor

• Output short protection

□Boost DCDC Converter ：

• Input voltage (Battery) = 2.7V ∼ 4.5V Æ Boosted voltage will be 8.75V

• Over-current protection

• Over-voltage protection

□Control function ：

• Pre-gain amplifier −6dB ∼ +15dB, 3dB step * Adjustable by Pin (PG0, PG1 and PG2) control

• Built-in Second order lowpass filter at Input.

• Cutoff Frequency (4kHz,8kHz,16kHz)

• Power-on/off control

• Over-temperature protection

* Adjustable by Pin (PG0, PG1 and PG2) control

□Operational voltage ：VBAT=2.7V ∼ 4.5V、DVDDI=1.65V ∼ 4.5V

□Operational temperature ：−30°C ∼ 85°C

□Package ：31pin WL-CSP (3.0mm × 3.0mm, 0.5mm pitch)

Rev.00

－1 –

2007/08

12 3 4 5 6 7...21

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