参数资料
型号: LTC3631EMS8E-5#TRPBF
厂商: Linear Technology
文件页数: 16/22页
文件大小: 0K
描述: IC REG BUCK SYNC 5V 0.1A 8MSOP
标准包装: 2,500
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 4.5 V ~ 45 V
PWM 型: Burst Mode?
电流 - 输出: 100mA
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: 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
LTC3631
APPLICATIONS INFORMATION
R2 =
? R1 = 224k
R3 =
? R1 – R2 = 94.8k
V IN V OUT
The undervoltage lockout requirement on V IN can be
satisfied with a resistive divider from V IN to the RUN
and HYST pins. Choose R1 = 2M and calculate R2 and
R3 as follows:
1.21V
V IN(RISING) – 1.21V
1.1V
V IN(FALLING) – 1.1V
Choose standard values for R2 = 226k and R3 = 95.3k.
The I SET pin should be left open in this example to select
maximum peak current (225mA). Figure 9 shows a com-
plete schematic for this design example.
2. Connect the (+) terminal of the input capacitor, C IN , as
close as possible to the V IN pin. This capacitor provides
the AC current into the internal power MOSFETs.
3. Keep the switching node, SW, away from all sensitive
small signal nodes. The rapid transitions on the switching
node can couple to high impedance nodes, in particular
V FB , and create increased output ripple.
4. Flood all unused area on all layers with copper. Flooding
with copper will reduce the temperature rise of power
components. You can connect the copper areas to any
DC net (V IN , V OUT , GND or any other DC rail in your
system).
Example Layout
L1
V IN SW
V IN
24V
1μF
2M
226k
95.3k
V IN SW
LTC3631
RUN I SET
SS
HYST V FB
GND
47μH
750k
240k
V OUT
3.3V
100mA
10μF
C IN
C SS
LTC3631
RUN
HYST V FB
SS I SET
GND
R SET
R1
R2
C OUT
3631 F09a
3631 F09
Figure 9. 24V to 3.3V, 100mA Regulator at 250kHz
L1
V IN
C IN
C OUT
V OUT
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3631. Check the following in your layout:
R1
R SET C SS
1. Large switched currents flow in the power switches
and input capacitor. The loop formed by these compo-
nents should be as small as possible. A ground plane
is recommended to minimize ground impedance.
GND
VIAS TO GROUND PLANE
R2
VIAS TO INPUT SUPPLY (V IN )
OUTLINE OF LOCAL GROUND PLANE
3631fe
16
For more information www.linear.com/LTC3631
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