参数资料
| 型号： | A8447SLJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 8SOIC |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 24 V |
| 输入电压： | 8 V ~ 50 V |
| PWM 型： | 电流模式 |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOIC-EP |
| 产品目录页面： | 1142 (CN2011-ZH PDF) |
| 其它名称： | 620-1174-6 |
A8447
High Voltage Step Down Regulator
Recommended PCB Layout
In order to minimize the effects of ground bounce and offset
issues, it is important to have a low impedance ground located
very close to the device. This grounding scheme is known as star
grounding. It is likely that a ground plane will be necessary to
meet thermal requirements. The recommended land pattern illus-
trates how to create a low impedance ground that will also assist
with removing thermal energy from the device.
The input capacitor must be placed as close as possible to the
VIN terminal because during the on cycle it is responsible for
supplying the current to the switcher. During the off cycle, the
current path is from the negative terminal of the COUT cap,
through the diode and inductor, and then to the load. As a result,
COUT and the rectifier diode must share the connection at the
negative terminal of the CIN capacitor in order to reduce ground
bounce when the diode is conducting.
CIN1
VIN
GND
The inductor should be connected as close as possible to the
switching node to minimize noise. Some applications may require
a shielded inductor due to EMI restrictions. This will depend on
the application and parameters defined by the system that will
host the regulator.
The high voltage-switching node could affect R TSET . If longer
off-times are used, the resistance on the RTSET pin can be quite
large. When designing the layout, try to keep RTSET away from
the inductor and switching node. It is also beneficial to keep the
trace as short as possible to reduce the effect of noise injection.
Because of this layout guideline, the TSET pin is located on the
other side of the device, away from the switching node.
The FB resistor network should have a lower impedance to avoid
interference from the switching node. Because the impedance
on the FB node can be controlled, it is not as critical to keep the
network isolated. It is important to keep the ground trace short so
that ground bounce cannot effect the output voltage regulation.
Star Ground
V IN
CIN2
CBOOT
CIN2
CIN1
CBOOT
RTSET
U1
R2
R1
D1
GND
GND
1
RTSET
BOOT
ENB
TSET
GND
A8447
PAD
VIN
LX
VBIAS
FB
R2
D1
CBYP
L1
COUT
GND
L1
COUT
R1
V OUT
CBYP
VOUT
Exposed copper thermal
ground area on the
unpopulated side of the PCB
The large star ground area on the populated side of the PCB, shown in the diagram as the GND nodes, supports high current throughput, and allows
the VOUT node to be located as close as practical to the A8447 (U1). Thermal conduction from the A8447 is enhanced by direct contact of its
exposed thermal pad to the smaller ground area under the A8447. This area is connected by thermal vias to the large copper ground plane on the
unpopulated side of the PCB.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8
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