参数资料
型号: MIC4685WR
厂商: Micrel Inc
文件页数: 12/17页
文件大小: 0K
描述: IC REG BUCK ADJ 3A SPAK-7
标准包装: 48
系列: SuperSwitcher™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1.235V
输入电压: 4 V ~ 30 V
PWM 型: 电压模式
频率 - 开关: 200kHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SPak(7 引线 + 接片)
包装: 散装
供应商设备封装: S-PAK-7
产品目录页面: 1093 (CN2011-ZH PDF)
其它名称: 576-1224
Micrel, Inc.
Layout Considerations
Layout is very important when designing any switching
regulator. Rapidly changing currents, through the printed
circuit board traces and stray inductance, can generate
voltage transients which can cause problems.
To minimize stray inductance and ground loops, keep
trace lengths as short as possible. For example, keep
D1 close to pin 6 and pin 4, and Tab, keep L1 away from
sensitive node FB, and keep C IN close to pin 2 and pin 4,
and Tab. See “ Applications Information: Thermal
Considerations ” for ground plane layout.
The feedback pin should be kept as far way from the
switching elements (usually L1 and D1) as possible.
A circuit with sample layouts are provided. See Figure 6.
Gerber ? les are available upon request.
MIC4685
Bootstrap Diode
The bootstrap diode provides an external bias source
directly to the main pass element, this reduces V SAT thus
allowing the MIC4685 to be used in very low head-room
applications i.e., 5V IN to 3.3V OUT with high ef ? ciencies.
Bootstrap diode not for use if V IN exceeds 16V, V IN . See
Figure 2.
EN
SW
V IN
+4V to +30V
(34V transient)
C IN
7-pin
SPAK
2 IN BS 1
5 6
MIC4685_R
FB 3
GND
4,Tab Tab
D1
L1
39μH
C OUT
V OUT
R1
R2
GND
Figure 2. Critical Traces for Layout
January 2010
12
M9999-012610
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