参数资料
型号: LT1946EMS8E#TRPBF
厂商: Linear Technology
文件页数: 8/12页
文件大小: 0K
描述: IC REG BOOST 1.5A 8MSOP
标准包装: 2,500
类型: 升压(升压)
输出数: 1
输入电压: 2.45 V ~ 16 V
PWM 型: 电流模式
频率 - 开关: 2.7MHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 8-MSOP-EP
LT1946
APPLICATIO S I FOR ATIO
100
50
0
Diode Selection
A Schottky diode is recommended for use with the LT1946.
The Microsemi UPS120 is a very good choice. Where the
input to output voltage differential exceeds 20V, use the
UPS140 (a 40V diode). These diodes are rated to handle an
average forward current of 1A. For applications where the
average forward current of the diode is less than 0.5A, an
ON Semiconductor MBR0520 diode can be used
–50
100
0
1k
10k 25k 100k
FREQUENCY (Hz)
1M
1946 F05a
Setting Output Voltage
To set the output voltage, select the values of R1 and R2
(see Figure 1) according to the following equation:
R 1 = R 2 ? OUT – 1 ?
? V ?
? 1 . 25 V ?
–100
–180
60 °
A good range for R2 is from 5k to 30k.
Layout Hints
The high speed operation of the LT1946 demands careful
attention to board layout. You will not get advertised
–200
100
1k
10k 25k 100k
1M
performance with careless layout. Figure 6 shows the
FREQUENCY (Hz)
1946 F05b
Figure 5. Bode Plot of Figure 1’s Circuit
GROUND PLANE
C SS
recommended component placement for a boost
converter.
C C
C1
+
V IN
R C
R1
1
8
R2
2
3
LT1946
7
6
L1
SHUTDOWN
MULTIPLE
VIAs
GND
4
C2
5
V OUT
1946 F06
Figure 6. Recommended Component Placement for Boost Converter. Note Direct High Current Paths Using Wide PC Traces. Minimize
Trace Area at Pin 1 (V C ) and Pin 2 (FB). Use Multiple Vias to Tie Pin 4 Copper to Ground Plane. Use Vias at One Location Only to Avoid
Introducing Switching Currents Into the Ground Plane
1946fb
8
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