LTC3828_15 Datasheet, PDF (9/32 Pages) Linear Technology – Dual, 2-Phase Step-Down Controller with Tracking

LTC3828
BLOCK DIAGRAM
PHSMD
PHASE LOGIC
CLKOUT
PLLFLTR
R_LP
C_LP
PGOOD
PHASE DET
OSCILLATOR
CLK1
CLK2
0.86V
V_OSENSE1
0.74V
0.86V
3V
0.18μA
FCB/PLLIN
4.5V –
+
PLL
DETECTOR
+
–
V_OSENSE2
0.74V
BINH
FCB
0.8V
V_REF
5V LDO REG
INTERNAL
SUPPLY
V_IN
DRV_CC
INTV_CC
5V
+
SGND (UH PACKAGE PAD)
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
DRV_CC
V_IN
BOOST
D_B
DROP
OUT
TG
C_B
TOP
DET
BOT FCB
SQ
TOP ON
SW
DRV_CC
RQ
SWITCH
LOGIC
BG
BOT
0.55V + ^B
PGND
–
SHDN
INTV_CC
I₁
0.86V
4 s V_FB
–
– ++ –
+ _I2
3mV
30k ^SENSE+
30k ^SENSE–
SLOPE COMP 45k
EA
45k
2.4V
0.80V _OV
1.2μA
V_FB
V_OSENSE
TRCKSS
0.86V
I_TH
C_C
100k
SHDN
RST
4(V_FB)
RUN
SOFT-
START
C_C2
RUN
Figure 1
3828 FD/F01
+
D1
C_IN
C_OUT
R_SENSE
R2
R1
C_SS
R_C
V_OUT
3828fc
9