LTC3838-2_15 Datasheet, PDF (13/56 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with xternal Reference Voltage and Dual Differential Output Sensing

LTC3838-2
FUNCTIONAL DIAGRAM
1-2µA
PTAT
5µA
RUN
+
UVLO
1.2V –
EN_DRV
V_IN
IN
EN LDO
OUT SD
4.2V
BOOST
TG
DRV
TG
SW
EXTV_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
CONTINUOUS
MODE
MODE/CLK
DETECT
250k
ON-TIME
ADJUST
PHASE
DETECTOR
CLK1
CLOCK PLL/
GENERATOR CLK2
TO CHANNEL 2
I_CMP
+–
I_REV
+–
~4.6V
INTV_CC
DRV_CC2
DRV_CC1
BG DRV
BG
PGND
SENSE⁺
SENSE^–
DELAY
+7.5%
UV
OV
–7.5%
EA
g_m
V_REFERENCE
1µA
TRACK/SS
0.6V INTERNAL (CHANNEL 1)
0.4V TO 2.5V EXTERNAL (CHANNEL 2) EXTVREF2
V_FB1 (CHANNEL 1)
V_OUTSENSE1+
DIFFAMP
(A = 1)
V_{OUTSENSE1–}
V_FB2 (CHANNEL 2)
V_DFB2+
INTV_CC
V_DFB2–
50k 50k
V_IN
C_B
D_B
M_T
L
R_SENSE
DRV_CC
V_OUT+
C_INTVCC
C_DRVCC
M_B
C_OUT
V_OUT–
C_SS
R_FB1 (1)
R_FB2 (1)
REMOTE OUTPUT
SENSING
(CHANNEL 1)
V_OUT1+
V_OUT1–
R_DFB1//R_DFB2
R_DFB1
R_DFB2
REMOTE OUTPUT
SENSING
(CHANNEL 2)
V_OUT2+
V_OUT2–
V_REF2+
DIFFERENTIAL
EXTERNAL
REFERENCE
SENSING
(CHANNEL 2)
+– _VREF2
V_REF2–
DUPLICATE DASHED
LINE BOX FOR
CHANNEL 2
1/2 INTV_CC
+
–
I_TH
DTR
INTV_CC
C_ITH1
R_ITH2
C_ITH2
OPT
R_ITH1
LOAD
RELEASE
DETECTION
TO LOGIC
CONTROL
38382 FD
For more information www.linear.com/3838-2
38382f
13