LTC3827 Datasheet, PDF (10/36 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3827
FUNCTIONAL DIAGRAM
PLLIN/MODE
F_IN
5
PHASE DET
100k
PHASMD
3
PLLLPF
2
R_LP
C_LP
OSCILLATOR
CLKOUT
4
PGOOD1
27
PGOOD2
28
CLK1
CLK2
0.88V
V_FB1
0.72V
0.88V
V_FB2
INTV_CC-0.5V –
+
PLLIN/MODE
–
0.8V +
0.72V
FC
BURSTEN
V_IN
V_IN
22
EXTV_CC
20
INTV_CC
+ ¹⁹
SGND
6, 33
4.7V +
–
5.25V/
7.5V
LDO
INTERNAL
SUPPLY
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
INTV_CC
V_IN
BOOST
24, 17
D_B
DROP
OUT
DET
SQ
RQ
BOT FC
TOP ON
TG
26, 15
TOP
SW
25, 16
SWITCH
LOGIC
INTV_{CC BG}
23, 18
BOT
BURSTEN
0.4V + ^B
SLEEP
–
SHDN
PGND
21
C_B
D
C_IN
C_OUT
L
R_SENSE
ICMP
–
0.45V
2(V_FB)
SLOPE
COMP
0.5μA
++
–
6mV
IR
–
+
SENSE⁺
32, 10
SENSE^–
1, 9
EA
OV
V_FB
TRACK/SS
0.80V
0.88V
V_FB
31, 11
I_TH
30,12
6V
RUN
7, 8
SHDN
RST
2(V_FB)
FOLDBACK
1μA
TRACK/SS
29, 13
SHDN
14 FOLDDIS
R_B
R_A
C_C
C_C2
R_C
C_SS
3827 FD
V_OUT
3827ff
10