OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC3858IUH-2#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P40
LTC3858-2
31
38582f
Figure 11. Recommended Printed Circuit Layout Diagram
APPLICATIONS INFORMATION
C
B2
C
B1
R
PU1
PGOOD1
V
PULL-UP
(<6V)
C
INTVCC
C
IN
D1
1µF
CERAMIC
M1 M2
M3
M4
D2
+
C
VIN
V
OUT1
V
IN
R
IN
L1
L2
C
OUT1
V
OUT1
GND
V
OUT2
38582 F11
+
C
OUT2
+
R
SENSE
R
SENSE
R
PU2
PGOOD2
V
PULL-UP
(<6V)
f
IN
1µF
CERAMIC
I
TH1
V
FB1
SENSE1
+
SENSE1
–
FREQ
SENSE2
–
SENSE2
+
V
FB2
I
TH2
SS2
SS1
PGOOD2
PGOOD1
TG1
SW1
BOOST1
BG1
V
IN
PGND
EXTV
CC
INTV
CC
BG2
BOOST2
SW2
TG2
PHASMD
CLKOUT
PLLIN/MODE
RUN1
RUN2
SGND
LTC3858-2
LTC3858-2
32
38582f
APPLICATIONS INFORMATION
Figure 12. Branch Current Waveforms
R
L1
D1
L1
SW1
R
SENSE1
V
OUT1
C
OUT1
V
IN
C
IN
R
IN
R
L2
D2
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
L2
SW2
38582 F12
R
SENSE2
V
OUT2
C
OUT2
LTC3858-2
33
38582f
TYPICAL APPLICATIONS
Efficiency vs Output Current Start-Up SW Node Waveforms
Figure 13. High Efficiency Dual 8.5V/3.3V Step-Down Converter
OUTPUT CURRENT (A)
0.00001 0.0001
40
EFFICIENCY (%)
50
60
70
80
0.001 0.01 0.1 1 10
38582 F13b
30
20
10
0
90
100
V
IN
= 12V
Burst Mode OPERATION
V
OUT
= 8.5V V
OUT
= 3.3V
38582 F13c
V
OUT2
2V/DIV
V
OUT1
2V/DIV
20ms/DIV
38582 F13d
SW1
5V/DIV
SW2
5V/DIV
1µs/DIV
SENSE1
+
SENSE1
–
SENSE2
–
SENSE2
+
V
FB1
I
TH1
SGND
EXTV
CC
V
OUT2
RUN1
RUN2
FREQ
SS2
V
FB2
SS1
I
LIM
PHASMD
CLKOUT
PLLIN/MODE
PGOOD1
PGOOD2
BG1
SW1
BOOST1
TG1
V
IN
INTV
CC
PGND
TG2
BG2
BOOST2
SW2
C1
1nF
R
B1
215k
C
OUT1
, C
OUT2
: SANYO 10TPD150M
L1: SUMIDA CDEP105-3R2M
L2: SUMIDA CDEP105-7R2M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
C
F1
15pF
C
ITH1A
150pF
C
SS1
0.1µF
V
OUT2
C
SS2
0.1µF
C
ITH1
820pF
C
INT
4.7µF
C
B1
0.47µF
C
B2
0.47µF
D1
V
IN
9V TO 38V
D2
LTC3858-2
L1
3.3µH
L2
7.2µH
R
SENSE1
7m
R
SENSE2
10m
MBOT1
MTOP2
MTOP1
MBOT2
38582 F13
100k
100k
INTV
CC
C
OUT1
150µF
V
OUT1
3.3V
5A
V
OUT2
8.5V
3A
C
IN
22µF
C
OUT2
150µF
R
A1
68.1k
R
A2
44.2k
R
B2
422k
C
F2
39pF
R
ITH1
15k
215k
(OPTIONAL
TRACKING)
68.1k
C2
1nF
I
TH2
C
ITH2
680pF
C
ITH2A
100pF
R
ITH2
27k
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P40

LTC3858IUH-2#PBF

Mfr. #:
Buy LTC3858IUH-2#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Low IQ, Dual, 2-Phase Synchronous Step-Down Controller without OVP
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet