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LTC3859AL Datasheet(PDF) 40 Page - Linear Technology

Part # LTC3859AL
Description  Low IQ, 38V Synchronous BoostBuck Controller
PDF  44 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3859AL Datasheet(HTML) 40 Page - Linear Technology

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LTC7812
40
7812fc
For more information www.linear.com/LTC7812
TYPICAL APPLICATIONS
Figure 12. Wide Input Range to 5V/5A Low IQ Cascaded Boost + Buck Regulator (VMID Boosted to 10V)
VIN
5V TO 38V
DOWN TO
2.5V AFTER
START-UP
CIN1
220µF
1000pF
CB2
0.1µF
4.7µF
DB1
DB2
CB1
0.1µF
VOUT
5V
5A
VMID, 10V*
RSENSE2
2m
RSENSE1
6m
L2, 1.2µH
MBOT2
MTOP2
MTOP1
MBOT1
L1, 4.9µH
RB1
375k
RA1
68.1k
FREQ
INTVCC
VFB2
RUN1
15k
1.5nF
CSS2
0.01µF
CSS1
0.1µF
100pF
EXTVCC
PGOOD1
OV2
SS2
ITH1
SGND
7812 F12a
RUN2
ITH2
SENSE2–
SENSE2+
VFB1
PGND
VBIAS
TG2
SW2 BOOST2
BG2
BG1
BOOST1 SW1
TG1
SENSE1+ SENSE1–
PLLIN/MODE
TRACK/SS1
LTC7812
3.6k
10nF
820pF
+
COUT1
220µF
+
CMID1
220µF
RB2
499k
RA2
68.1k
+
1M
1M
INTVCC
PGOOD1
OV2
MTOP1, MBOT1: INFINEON BSZ097N04LS
MTOP2, MBOT2: INFINEON BSC027N04LS
L1: WURTH 744314490
L2: WURTH 744325120
CIN1, CMID1: SUNCON 50CE220LX
COUT1: SANYO 6TPB220ML
DB1, DB2: CENTRAL SEMI CMDSH-4E
*VMID = 10V WHEN VIN < 10V
VMID FOLLOWS VIN WHEN VIN > 10V
7812 F12b
CISPR-25 CONDUCTED EMI MEASUREMENT
VIN = 13.5V, IOUT = 8A
0
0
30
15
FREQUENCY (MHz)
100
50



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