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參數(shù)資料

型號(hào)：	MAX8667ETEAA+
廠商：	Maxim Integrated
文件頁(yè)數(shù)：	15/18頁(yè)
文件大小：	388K
描述：	IC REG QD BCK/LINEAR SYNC 16TQFN
產(chǎn)品培訓(xùn)模塊：	Lead (SnPb) Finish for COTS Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝：	100
拓?fù)洌?/td>	降壓（降壓）同步（2），線性（LDO）（2）
功能：	任何功能
輸出數(shù)：	4
頻率 - 開關(guān)：	1.5MHz
電壓/電流 - 輸出 1：	1.2V，600mA
電壓/電流 - 輸出 2：	1.8V，1.2A
電壓/電流 - 輸出 3：	2.8V，300mA
帶 LED 驅(qū)動(dòng)器：	無
帶監(jiān)控器：	無
帶序列發(fā)生器：	無
電源電壓：	2.8 V ~ 5.5 V
工作溫度：	-40°C ~ 85°C
安裝類型：	表面貼裝
封裝/外殼：	16-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝：	16-TQFN-EP（3x3）
包裝：	管件

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1.5MHz Dual Step-Down DC-DC Converters

with Dual LDOs and Individual Enables

______________________________________________________________________________________ 15

C10 is needed if V

OUT

> 1.5V or V

IN12

can be less than

OUT

/ 0.65.

LDO Output Capacitor and Stability

Connect a 4.7礔 ceramic capacitor between OUT3 and

GND, and a second 4.7礔 ceramic capacitor from

OUT4 to GND. For a constant loading above 10mA, the

output capacitors can be reduced to 2.2礔. The equiv-

alent series resistance (ESR) of the LDO output capaci-

tors affects stability and output noise. Use output

capacitors with an ESR of 0.1&or less to ensure stable

operation and optimum transient response. Surface-

mount ceramic capacitors have very low ESR and are

commonly available. Connect these capacitors as

close as possible to the ICs pins to minimize PCB trace

inductance.

Thermal Considerations

The maximum package power dissipation of the

MAX8667/MAX8668 is 1667mW. Make sure the power

dissipated by the MAX8667/MAX8668 does not exceed

this rating. The total IC power dissipation is the sum of

the power dissipation of the four regulators:

Estimate the OUT1 and OUT2 power dissipations as

follows:

where R

is the inductors DC resistance, and 穒s the

efficiency (see the Typical Operating Characteristics

section).

Calculate the OUT3 and OUT4 power dissipations as

follows:

The maximum junction temperature of the MAX8667/

MAX8668 is +150癈. The junction-to-case thermal

resistance (?/DIV>

) of the MAX8667/MAX8668 is 6.9癈/W.

When mounted on a single-layer PCB, the junction to

ambient thermal resistance (?/DIV>

) is about 64癈/W.

Mounted on a multilayer PCB, ?/DIV>

is about 48癈/W.

Calculate the junction temperature of the

MAX8667/MAX8668 as follows:

where T

is the maximum ambient temperature. Make

sure the calculated value of T

does not exceed the

+150癈 maximum.

PCB Layout

High switching frequencies and relatively large peak

currents make PCB layout a very important aspect of

design. Good design minimizes excessive EMI on the

feedback paths and voltage gradients in the ground

plane, both of which can result in instability or regula-

tion errors. Connect the input capacitors as close as

possible to the IN_ and PGND_ pins. Connect the

inductor and output capacitors as close as possible to

the IC and keep the traces short, direct, and wide.

The feedback network traces are sensitive to inductor

magnetic field interference. Route these traces away

from the inductors and noisy traces such as LX. Keep

the feedback components close to the FB_ pin.

Connect GND and PGND_ to the ground plane.

Connect the exposed paddle to the ground plane with

one or more vias to help conduct heat away from the

IC.

Refer to the MAX8668 evaluation kit for a PCB layout

example.

T T P

J A D JA

= + ?/DIV>

?/DIV>

P I V V

D OUT IN OUT

4 4 34

= ?nbsp

(

)

P I V V

D OUT IN OUT

3 3 34

= ?nbsp

(

)

P I V

D OUT OUT

2 2

= ?nbsp ?/DIV>

?/DIV>

P I V

D OUT OUT

1 1 1

= ?nbsp ?/DIV>

?/DIV>

P P P P P

D D D D D

= + + +

1 2 3 4

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
MAX8667ETEAA+	功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX8667ETEAA+T	功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX8667ETEAB+	功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX8667ETEAB+T	功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX8667ETEAC+	功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT

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