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LTC3826_15 Datasheet, PDF (10/36 Pages) Linear Technology – 30A IQ, Dual, 2-Phase Synchronous Step-Down Controller
LTC3826
BLOCK DIAGRAM
PLLIN/MODE
FIN
5
PHASE DET
100k
PHASMD
3
PLLLPF
2
RLP
CLP
OSCILLATOR
CLKOUT
4
PGOOD1
27
PGOOD2
28
CLK1
CLK2
0.88V
VFB1
0.72V
0.88V
VFB2
INTVCC-0.5V –
+
PLLIN/MODE
–
0.8V +
0.72V
FC
BURSTEN
VIN
VIN
22
EXTVCC
20
INTVCC
+ 19
SGND
6, 33
4.7V +
–
5.25V/
7.5V
LDO
INTERNAL
SUPPLY
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
INTVCC
VIN
BOOST
24, 17
DB
DROP
OUT
DET
SQ
RQ
BOT FC
TOP ON
TG
26, 15
TOP
SW
25, 16
SWITCH
LOGIC
INTVCC BG
23, 18
BOT
BURSTEN
0.4V + B
SLEEP
–
SHDN
PGND
21
CB
D
CIN
COUT
L
RSENSE
ICMP
–
0.45V
2(VFB)
SLOPE
COMP
0.5μA
IR
–
++ –
+
6mV
EA
OV
VFB
TRACK/SS
0.80V
0.88V
SENSE+
32, 10
SENSE–
1, 9
VFB
31, 11
ITH
30,12
6V
RUN
7, 8
SHDN
RST
2(VFB)
FOLDBACK
1μA
TRACK/SS
29, 13
SHDN
14 FOLDDIS
RB
RA
CC
CC2
RC
CSS
3826 FD
VOUT
3826fc
10