参数资料
型号: LTC3838IFE#PBF
厂商: Linear Technology
文件页数: 43/54页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 38TSSOP
标准包装: 50
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 2MHz
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 管件
LTC3838
APPLICATIONS INFORMATION
SW2
L2
R SENSE2
C OUT2
V OUT2
R L2
V IN
R IN
C IN
SW1
L1
R SENSE1 V OUT1
BOLD LINES INDICATE
C OUT1
R L1
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
3838 F15
Figure 15. Branch Current Waveforms
? The top N-channel MOSFETs of the two channels have
to be located within a short distance from (preferably
<1cm) each other with a common drain connection at
C IN . Do not attempt to split the input decoupling for the
two channels as it can result in a large resonant loop.
? Connect the input capacitor(s), C IN , close to the power
MOSFETs. This capacitor provides the MOSFET transient
spike current. Connect the drain of the top MOSFET as
close as possible to the (+) plate of the ceramic portion
of input capacitors C IN . Connect the source of the bot-
tom MOSFET as close as possible to the (–) terminal
of the same ceramic C IN capacitor(s). These ceramic
capacitor(s) bypass the high di/dt current locally, and
both top and bottom MOSFET should have short PCB
trace lengths to minimize high frequency EMI and
prevent MOSFET voltage stress from inductive ringing.
3838fa
43
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