参数资料
型号: LTC3707IGN#TRPBF
厂商: Linear Technology
文件页数: 28/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-SSOP
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 360kHz
占空比: 99.4%
电源电压: 4.5 V ~ 28 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: 28-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC3707
APPLICATIONS INFORMATION
SW1
L1
R SENSE1
V OUT1
D1
C OUT1
+
R L1
V IN
R IN
C IN
+
SW2
L2
R SENSE2
V OUT2
BOLD LINES INDICATE
D2
C OUT2
+
R L2
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH.
3707 F11
Figure 11. Branch Current Waveforms
4. Are the SENSE – and SENSE + leads routed together with
minimum PC trace spacing? The ?lter capacitor between
SENSE + and SENSE – should be as close as possible to
the IC. Ensure accurate current sensing with Kelvin con-
nections at the SENSE resistor.
5. Is the INTV CC decoupling capacitor connected close to
the IC, between the INTV CC and the power ground pins?
This capacitor carries the MOSFET drivers current peaks.
An additional 1μF ceramic capacitor placed immediately
next to the INTV CC and PGND pins can help improve noise
performance substantially.
from sensitive small-signal nodes, especially from the
opposites channel’s voltage and current sensing feedback
pins. All of these nodes have very large and fast moving
signals and therefore should be kept on the “output side”
of the LTC3707 and occupy minimum PC trace area.
7. Use a modi?ed “star ground” technique: a low imped-
ance, large copper area central grounding point on the same
side of the PC board as the input and output capacitors with
tie-ins for the bottom of the INTV CC decoupling capacitor,
the bottom of the voltage feedback resistive divider and
the SGND pin of the IC.
6. Keep the switching nodes (SW1, SW2), top gate nodes
(TG1, TG2), and boost nodes (BOOST1, BOOST2) away
3707fb
28
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