参数资料
型号: A8447SLJTR-T
厂商: Allegro Microsystems Inc
文件页数: 1/9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:
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
Features and Benefits
Description
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Wide input voltage range: 8 to 50 V
Integrated low R DS(on) DMOS switch
3 A continuous output current
Adjustable fixed off-time
Highly efficient
Adjustable output: 0.8 to 24 V
Small package with exposed thermal pad
The A8447 is a 3 A, high efficiency general-purpose buck
regulator designed for a wide variety of applications. The output
voltage is adjustable from 0.8 to 24 V, based on a resistor divider
and the 0.8 V ±2% reference. External components include an
external clamping diode, inductor, and filter capacitor. The off-
time is determined by an external resistor to ground. It operates
in both continuous and discontinuous modes to maintain light
load regulation. An internal blanking circuit is used to filter
out transients due to the reverse recovery of the external clamp
diode. Typical blanking time is 200 ns.
This new device is ideal for various end products including
applications with 8 to 50 V input voltage range and require up
to 3 A output current, such as uninterruptible power supplies,
Package: 8 pin SOIC with exposed thermal
pad (suffix LJ)
point of sale (POS) applications, and industrial applications
with 24 or 36 V bus.
Applications include:
? Printer power supplies
? Office automation equipment
? POS thermal, laser, photo, and inkjet printers
? Tape drives
? Industrial applications
Approximate Scale 1:1
Typical Application
+42 V
CBOOT
0.01 μ F
Efficiency vs. Output Current
CIN2
CIN1
0.22 μ F
90.0
88.0
BOOT
VIN
D1
86.0
84.0
ENB
A8447
LX
L1
V OUT
82.0
80.0
RTSET
54 k
TSET
GND
VBIAS
FB
R1
2.87 k
R2
910
CBYP
0.22 μ F
3.3 V
3A
ESR
COUT
220 μ F
25 V
78.0
76.0
74.0
72.0
70.0
0
500
1000
1500
2000
V OUT (V)
5
3.3
2500
3000
I OUT (mA)
Data is for reference only. Efficiency data from circuit shown in left panel.
A8447-DS, Rev. 3
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