参数资料
型号: LTC3612EFE#TRPBF
厂商: Linear Technology
文件页数: 24/30页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 3A 20TSSOP
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 5.5 V
输入电压: 2.25 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 300kHz ~ 4MHz
电流 - 输出: 3A
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: 20-TSSOP(0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 20-TSSOP-EP
LTC3612
APPLICATIONS INFORMATION
I RMS = 3A ?
– 1 ? = 1.5A RMS
? ?
? 1 ?
R1 = 196k ? ?
C SS =
= 21.6nF
2M ?In ?
C OUT willbeselectedbasedontheESRthatisrequiredto
satisfy the output voltage ripple requirement and the bulk
capacitance needed for loop stability. For this design, a
68μF (or 47μF plus 22μF) ceramic capacitor is used with
a X5R or X7R dielectric.
C IN should be sized for a maximum current rating of:
1.8V ? 3.6V ?
3.6V ? 1.8V ?
Decoupling the PV IN with two 22μF capacitors, is adequate
for most applications.
If we set R2 = 196k, the value of R1 can now be determined
by solving the following equation.
? 1.8V ?
? 0.6V ?
A value of 392k will be selected for R1.
Finally, define the soft start-up time choosing the proper
value for the capacitor and the resistor connected to TRACK/
SS. If we set minimum t SS = 5ms and a resistor of 2M,
the following equation can be solved with the maximum
SV IN = 5.5V :
5ms
? 5.5V ?
? 5.5V – 0.6V ? ?
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3612:
1. A ground plane is recommended. If a ground plane layer
is not used, the signal and power grounds should be
segregated with all small-signal components returning
to the SGND pin at one point which is then connected
to the PGND pin close to the LTC3612.
2. Connect the (+) terminal of the input capacitor(s), C IN ,
as close as possible to the PV IN pin, and the (–) terminal
as close as possible to the exposed pad, PGND. This
capacitor provides the AC current into the internal power
MOSFETs.
3. Keep the switching node, SW, away from all sensitive
small-signal nodes.
4. Flood all unused areas on all layers with copper. Flood-
ing with copper will reduce the temperature rise of
power components. Connect the copper areas to PGND
(exposed pad) for best performance.
5. Connect the V FB pin directly to the feedback resistors.
The resistor divider must be connected between V OUT
and SGND.
The standard value of 22nF guarantees the minimum soft-
start up time of 5ms.
Figure 1 shows the schematic for this design example.
3612fb
24
For more information www.linear.com/LTC3612
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