LTC3857-1_15 Datasheet, PDF (10/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3857-1
FUNCTIONAL DIAGRAM
PGOOD1
FREQ
20μA
0.88V
V_FB1
0.72V
VCO
CLK2
CLK1
C_LP
PFD
PLLIN/MODE
100k
SYNC
DET
V_IN
EXTV_CC
+
4.7V ^–
5.1V
LDO
EN
5.1V
LDO
EN
SGND
INTV_CC
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
BOOST
INTV_CC V_IN
D_B
DROP
OUT
DET
BOT
SQ
TOP ON
TG
TOP
SW
RQ
SHDN
INTV_CC
SWITCH
LOGIC _BOT
BG
PGND
C_B
D
C_IN
C_OUT
0.425V ⁺
–
SLEEP
ICMP
–+
2.7V
0.55V
+ ^IR
–
3mV
L
R_SENSE
SENSE⁺
SENSE^–
SLOPE COMP
V_FB
EA 0.80V
TRACK/SS
R_B
R_A
0.5μA
SHDN
11V
RST
2(V_FB)
RUN
OV
0.88V
I_TH
FOLDBACK
SHDN
1μA TRACK/SS
C_C
C_C2 R_C
C_SS
38571 FD
V_OUT
38571fc
10