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參數(shù)資料
| 型號： | MAX887 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter |
| 中文描述： | 100%占空比、低噪聲、降壓型、PWM DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 146K |
| 代理商： | MAX887 |
M
100% Duty Cyc le, Low-Noise,
S tep-Down, PWM DC-DC Converter
______________________________________________________________________________________
11
Bypass V+ to GND using a 0.33μF capacitor. Also
bypass VL to GND with a 2.2μF capacitor, and VREF to
GND using a 0.047μF capacitor. These capacitors
should be placed within 0.2in (5mm) of their respective
pins. A small ceramic capacitor (C1) of around 100pF
to 470pF should be added in parallel with R1 to com-
pensate for stray capacitance at the FB pin and output
capacitor ESR.
Output Diode S elec tion
A 1A external diode (D1) is required as an output recti-
fier to pass inductor current during the second half of
each cycle. This diode operates in PFM mode and dur-
ing transition periods while the synchronous rectifier is
off. Use a Schottky diode to prevent the slow internal
diode of the N-channel MOSFET from turning on.
PC Board Layout and Routing
High switching frequencies and large peak currents
make PC board layout a very important part of design.
Poor design can result in excessive EMI on the feed-
back paths and voltage gradients in the ground plane,
both of which can result in instability or regulation
errors. Power components, such as the MAX887,
inductor, input filter capacitor, and output filter capaci-
tor should be placed as close together as possible,
and their traces kept short, direct, and wide. Connect
their ground pins at a common node in a star-ground
configuration. Keep the extra copper on the board and
integrate into ground as a pseudo-ground plane. The
external voltage-feedback network should be very
close to the FB pin, within 0.2in (5mm). Keep noisy
traces, such as from the LX pin, away from the voltage-
feedback network, and separate using grounded cop-
per. Place the small bypass capacitors (C1, C3, C5,
and C6) within 0.2in (5mm) of their respective pins. The
MAX887 evaluation kit manual illustrates an example
PC board layout, routing, and pseudo-ground plane.
___________________Chip Information
TRANSISTOR COUNT: 2006
SUBSTRATE CONNECTED TO GND
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| MAX8873REUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8873REUK+T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8873REUK-T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8873SEUK | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product 制造商:Rochester Electronics LLC 功能描述: |
| MAX8873SEUK+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.25V TO 6.5V/2.84V 0.12A 5PIN SOT-23 - Rail/Tube |
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