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参数资料
| 型号： | MAX887HESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 10 V |
| 输入电压： | 3.5 V ~ 11 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
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 Selection
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
______________________________________________________________________________________
11
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| MAX8880ETT | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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