LTC3890-3 Datasheet, PDF (10/40 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3890-3
FUNCTIONAL Diagram
PGOOD1
0.88V
V_FB1
0.72V
FREQ
20µA
VCO
CLK2
CLK1
C_LP
PFD
PLLIN/MODE
100k
V_IN
EXTV_CC
+
4.7V ^–
5.1V
LDO
EN
SYNC
DET
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
0.65V
+ ^IR
–
3mV
SENSE⁺
SENSE^–
SLOPE COMP
V_FB
EA 0.80V
TRACK/SS
OV
0.88V
ITH
7µA (RUN1)
0.5µA (RUN2) ^SHDN
RST
2(V_FB)
11V
FOLDBACK
SHDN
1µA TRACK/SS
L
R_SENSE
R_B
R_A
C_C
C_C2 R_C
C_SS
V_OUT
RUN
38901 FD
10
For more information www.linear.com/3890-3
38903f