参数资料
型号: LTC3707IGN#TRPBF
厂商: Linear Technology
文件页数: 27/32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
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC3707. These items are also illustrated graphically in
the layout diagram of Figure 10. The Figure 11 illustrates
the current waveforms present in the various branches
of the 2-phase synchronous regulators operating in the
continuous mode. Check the following in your layout:
1. Are the top N-channel MOSFETs M1 and M3 located
within 1cm of 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 cause a large resonant loop.
2. Are the signal and power grounds kept separate? The
combined LTC3707 signal ground pin and the ground return
of C INTVCC must return to the combined C OUT (–) terminals.
The path formed by the top N-channel MOSFET, Schottky
diode and the C IN capacitor should have short leads and
PC trace lengths. The output capacitor (–) terminals should
be connected as close as possible to the (–) terminals
of the input capacitor by placing the capacitors next to
each other and away from the Schottky loop described
above.
3. Do the LTC3707 V OSENSE pins resistive dividers connect
to the (+) terminals of C OUT ? The resistive divider must
be connected between the (+) terminal of C OUT and signal
ground and a small V OSENSE decoupling capacitor should
be as close as possible to the LTC3707 SGND pin. The R2
and R4 connections should not be along the high current
input feeds from the input capacitor(s).
R PU
V PULL-UP
1
RUN/SS1
PGOOD
28
PGOOD
(<7V)
R2
2
3
SENSE1 +
SENSE1 –
TG1
SW1
27
26
L1
R SENSE
V OUT1
R1
4
5
V OSENSE1
FREQSET
BOOST1
V IN
25
24
C B1
M1
M2
D1
6
STBYMD
BG1
23
R IN
C OUT1
INTV CC
7
8
9
FCB
I TH1
SGND
LTC3707
EXTV CC
INTV CC
PGND
22
21
20
C INTVCC
C VIN
V IN
C IN
C OUT2
GND
3.3V
10
3.3V OUT
BG2
19
11
I TH2
BOOST2
18
D2
12
V OSENSE2
SW2
17
C B2
M3
M4
R3
R4
13
SENSE2 –
TG2
16
R SENSE
V OUT2
14
SENSE2 +
RUN/SS2
15
L2
3707 F10
Figure 10. LTC3707 Recommended Printed Circuit Layout Diagram
3707fb
27
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