参数资料
型号: LTC3736EUF-1#TRPBF
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-QFN
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 825kHz
占空比: 100%
电源电压: 2.75 V ~ 9.8 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 带卷 (TR)
LTC3736-1
APPLICATIO S I FOR ATIO
at the FETs. It is better to have two separate, smaller valued
input capacitors (e.g., two 10 μ F—one for each channel)
than it is to have a single larger valued capacitor (e.g.,
22 μ F) that the channels share with a common connection.
2) The signal and power grounds should be kept separate.
The signal ground consists of the feedback resistor divid-
ers, I TH compensation networks and the SGND pin.
The power grounds consist of the (–) terminal of the input
and output capacitors and the source of the N-channel
MOSFET. Each channel should have its own power ground
for its power loop (as described in (1) above). The power
grounds for the two channels should connect together at
a common point. It is most important to keep the ground
paths with high switching currents away from each other.
The PGND pins on the LTC3736-1 IC should be shorted
together and connected to the common power ground
connection (away from the switching currents).
3) Put the feedback resistors close to the V FB pins. The
trace connecting the top feedback resistor (R B ) to the
output capacitor should be a Kelvin trace. The I TH compen-
sation components should also be very close to the
LTC3736-1.
4) The current sense traces (SENSE + and SW) should be
Kelvin connections right at the P-channel MOSFET source
and drain.
5) Keep the switch nodes (SW1, SW2) and the gate driver
nodes (TG1, TG2, BG1, BG2) away from the small-signal
components, especially the opposite channels feedback
resistors, I TH compensation components and the current
sense pins (SENSE + and SW).
MP1
L1
V OUT1
MN1
C OUT1
+
R L1
V IN
R IN
C IN
+
MP2
L2
V OUT2
MN2
C OUT2
+
R L2
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
37361 F12
MINIMUM LENGTH
Figure 12. Branch Current Waveforms
37361f
22
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