Datasheet > MAX9779ETI+T

MAX9779ETI+T

更新时间： 2024-02-01 06:00:25

品牌	Logo	应用领域
美信 - MAXIM		放大器信息通信管理商用集成电路
页数	文件大小	规格书
19页	420K
描述
Audio Amplifier, 2.6W, 2 Channel(s), 1 Func, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHHD-1, TQFN-28

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MAX9779ETI+T 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	QFN	包装说明：	HVQCCN, LCC28,.2SQ,20
针数：	28	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.82	标称带宽：	22 kHz
商用集成电路类型：	AUDIO AMPLIFIER	增益：	19.5 dB
JESD-30 代码：	S-XQCC-N28	JESD-609代码：	e3
长度：	5 mm	湿度敏感等级：	1
信道数量：	2	功能数量：	1
端子数量：	28	最高工作温度：	85 °C
最低工作温度：	-40 °C	标称输出功率：	2.6 W
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装等效代码：	LCC28,.2SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
电源：	5 V	认证状态：	Not Qualified
座面最大高度：	0.8 mm	子类别：	Audio/Video Amplifiers
最大压摆率：	29 mA	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V	表面贴装：	YES
技术：	BICMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	30	宽度：	5 mm
Base Number Matches：	1

MAX9779ETI+T 数据手册

2.6W Stereo Audio Power Amplifier and

DirectDrive Headphone Amplifier

Table 2. Suggested Capacitor Manufacturers

SUPPLIER

Taiyo Yuden

TDK

PHONE

FAX

WEBSITE

8±±-ꢀ48-ꢁ496

8±7-8±ꢀ-61±±

847-9ꢁ5-±899

847-ꢀ9±-44±5

www.t-yuden.com

www.component.tdk.com

BIAS Capacitor

BIAS is the output of the internally generated DC bias

voltage. The BIAS bypass capacitor, C , improves

transients. Bypass CPV with Cꢀ, the same value as C1,

and place it physically close to CPV

and PGND (refer

to the MAX9779 Evaluation Kit for a suggested layout).

BIAS

PSRR and THD+N by reducing power supply and other

noise sources at the common-mode bias node, and

also generates the clickless/popless, startup/shutdown

DC bias waveforms for the speaker amplifiers. Bypass

BIAS with a 1µF capacitor to GND.

Powering Other Circuits from a

Negative Supply

An additional benefit of the MAX9779 is the internally gen-

erated negative supply voltage (CPV ). CPV is used

by the MAX9779 to provide the negative supply for the

headphone amplifiers. It can also be used to power other

Charge-Pump Capacitor Selection

Use capacitors with an ESR less than 1±±mΩ for opti-

mum performance. Low-ESR ceramic capacitors mini-

mize the output resistance of the charge pump. For

best performance over the extended temperature

range, select capacitors with an X7R dielectric. Table 4

lists suggested manufacturers.

devices within a design. Current draw from CPV should

be limited to 5mA; exceeding this affects the operation of

the headphone amplifier. A typical application is a nega-

tive supply to adjust the contrast of LCD modules.

When considering the use of CPV

in this manner,

note that the charge-pump voltage of CPV is roughly

proportional to CPV

and is not a regulated voltage.

Flying Capacitor (C1)

The value of the flying capacitor (C1) affects the load

regulation and output resistance of the charge pump. A

C1 value that is too small degrades the device’s ability

to provide sufficient current drive, which leads to a loss

of output voltage. Increasing the value of C1 improves

load regulation and reduces the charge-pump output

resistance to an extent. See the Output Power vs.

Charge-Pump Capacitance and Load Resistance

graph in the Typical Operating Characteristics. Above

ꢁ.ꢁµF, the on-resistance of the switches and the ESR of

C1 and Cꢁ dominate.

The charge-pump output impedance plot appears in

the Typical Operating Characteristics.

Layout and Grounding

Proper layout and grounding are essential for optimum

performance. Use large traces for the power-supply

inputs and amplifier outputs to minimize losses due to

parasitic trace resistance, as well as route head away

from the device. Good grounding improves audio per-

formance, minimizes crosstalk between channels, and

prevents any switching noise from coupling into the audio

signal. Connect CPGND, PGND, and GND together at a

single point on the PC board. Route CPGND and all traces

that carry switching transients away from GND, PGND,

and the traces and components in the audio signal path.

Output Capacitor (C2)

The output capacitor value and ESR directly affect the

ripple at CPV . Increasing the value of Cꢁ reduces

output ripple. Likewise, decreasing the ESR of Cꢁ

reduces both ripple and output resistance. Lower

capacitance values can be used in systems with low

maximum output power levels. See the Output Power

vs. Charge-Pump Capacitance and Load Resistance

graph in the Typical Operating Characteristics.

Connect all components associated with the charge

pump (Cꢁ and Cꢀ) to the CPGND plane. Connect V

and CPV

together at the device. Place the charge-

pump capacitors (C1, Cꢁ, and Cꢀ) as close to the

device as possible. Bypass HPV and PV with a

±.1µF capacitor to GND. Place the bypass capacitors

as close to the device as possible.

CPV

Bypass Capacitor

Use large, low-resistance output traces. As load imped-

ance decreases, the current drawn from the device out-

puts increase. At higher current, the resistance of the

output traces decrease the power delivered to the load.

The CPV

bypass capacitor (Cꢀ) lowers the output

impedance of the power supply and reduces the

impact of the MAX9779’s charge-pump switching

______________________________________________________________________________________ 15

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MAX9779ETI+T 替代型号

型号	品牌	替代类型	描述	数据表
TPA6047A4RHBR	TI	功能相似	具有 4.75V LDO、使能端高电平有效的 2W、立体声 AB 类扬声器和耳机放大器 \|

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