LTC3839 Datasheet, PDF (11/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

FUNCTIONAL DIAGRAM
LTC3839
2-5μA
PTAT
10μA
RUN
+
UVLO
1.2V –
EN_DRV
+
V_IN
IN
EN LDO
OUT SD
4.2V
TG
BOOST
DRV
TG
SW
D_B
C_B
M_T
L
R_SENSE
EXTV_CC
DRV_CC
MODE/PLLIN
RT
R_T
CLKOUT
INTV_CC
R_PGD
PGOOD
~0.8V –
LOGIC
CONTROL
SENSE^–
V_IN
250k
ONE-SHOT
TIMER
START
STOP
FORCED
250k
CONTINUOUS
MODE
ON-TIME
ADJUST
MODE/CLK
DETECT
PHASE
DETECTOR
CLK1
CLOCK PLL/
GENERATOR ^CLK2
TO CHANNEL 2
I_CMP
+–
DUPLICATE DASHED
LINE BOX FOR
CHANNEL 2
g_m
0.555V
g_m
EA
UV
I_REV
+–
1μA
0.6V
DELAY
~4.6V INTV_CC
DRV_CC2
DRV_CC1
BG DRV
BG
PGND
SENSE⁺
SENSE^–
TRACK/SS
DIFFAMP
(A = 1)
V_OUTSENSE1+
V_{OUTSENSE1–}
C_INTVCC
C_DRVCC
M_B
C_SS
OV
0.645V
INTV_CC
1/2 INTV_CC
+
V_RNG
I_TH
–
DTR
SGND
LOAD
RELEASE
DETECTION
TO LOGIC
CONTROL
INTV_CC
INTV_CC
C_ITH1
R_ITH2
C_ITH2 ^RITH1
V_IN
V_OUT
C_OUT
R_FB2
R_FB1
3839 FD
3839fa
11