LTC3892-1_15 Datasheet, PDF (12/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

LTC3892/LTC3892-1
Functional Diagrams
CHANNELS 1 AND 2
DRV_CC
FREQ
20µA
CLK2
VCO _CLK1
PFD
PLLIN/MODE
I_LIM
PGOOD1
CURRENT
LIMIT
PGOOD2
SYNC
DET
100k
0.88V
EA1^–
0.72V
0.88V
EA2^–
0.72V
VPRG1
SQ
RQ
DROPOUT
DET
BOT
TOP ON
SHDN
BOOST1,2
TOP
TG1,2
SWITCHING
LOGIC
DRV_CC
BOT
SW1,2
BG1,2
GND
0.425V +
SLEEP
–
I_CMP
+ ^IR
+– –
3mV
2.8V
0.65V
SENSE1,2⁺
SENSE1,2^–
SLOPE COMP
EA^–
0.80V
TRACK/SS
R1
R2
V_FB1,2
3.5V
150nA
OV
SHDN
RST
2(V_FB)
FOLDBACK
0.88V
10µA
RUN1,2
SHDN
ITH1,2
TRACK/SS1,2
LTC3892 ONLY
NOT ON LTC3892-1
VPRG1 V_OUT1
R1 R2
FLOAT ADJUSTABLE 0 ∞
GND 3.3V FIXED 625k 200k
INTV_CC 5V FIXED 1.05M 200k
VPRG1 AFFECTS CHANNEL 1 ONLY,
V_OUT2 IS ALWAYS ADJUSTABLE (R1 = 0, R2 = ∞)
LTC3892-1 (R1 = 0, R2 = ∞)
20µA
DRVSET
2.00V
1.20V
DRVUV
EXTV_CC
V_IN
EN
DRV_CC
R ^4R
INTV_CC
DRV_CC LDO/UVLO
CONTROL
EN
4.7V/ ^–
7.7V ₊
INTV_CC
LDO
38921 FD
V_IN1,2
C_B
C_IN
C_OUT
V_OUT1,2
L
R_SENSE
R_B
R_A
C_C
C_C2
R_C
C_SS
12
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38921f