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LTC3838-1_15 Datasheet, PDF (13/52 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing | |||
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LTC3838-1
FUNCTIONAL DIAGRAM
1-2µA
PTAT
5µA
RUN
+
UVLO
1.2V â
EN_DRV
VIN
IN
EN LDO
OUT SD
4.2V
+
MODE/PLLIN
RT
RT
CLKOUT
INTVCC
RPGD
PGOOD
~0.8V â
LOGIC
CONTROL
SENSEâ
VIN
250k
ONE-SHOT
TIMER
START
STOP
250k
FORCED
CONTINUOUS
MODE
ON-TIME
ADJUST
MODE/CLK
DETECT
PHASE
DETECTOR
CLK1
CLOCK PLL/
GENERATOR CLK2
TO CHANNEL 2
ICMP
+â
IREV
+â
DELAY
0.555V
UV
1µA
EA
gm
0.6V VREFERENCE
VFB1 (CHANNEL 1)
OV
0.645V
VFB2 (CHANNEL 2)
INTVCC
BOOST
TG
DRV
TG
SW
EXTVCC
~4.6V
INTVCC
DRVCC2
DRVCC1
BG DRV
BG
PGND
SENSE+
SENSEâ
TRACK/SS
VOUTSENSE1+
DIFFAMP
(A = 1)
VOUTSENSE1â
VDFB2+
VDFB2â
50k 50k
VIN
CB
DB
MT
L
RSENSE
DRVCC
VOUT+
CINTVCC
CDRVCC
MB
COUT
VOUTâ
CSS
RFB1
REMOTE OUTPUT
SENSING
RFB2
(CHANNEL 1)
VOUT1+
VOUT1â
RDFB1//RDFB2
RDFB1
RDFB2
REMOTE OUTPUT
SENSING
(CHANNEL 2)
VOUT2+
VOUT2â
DUPLICATE DASHED
LINE BOX FOR
CHANNEL 2
VRNG
ITH
1/2 INTVCC
+
â
DTR
INTVCC
INTVCC
CITH1
RITH2
CITH2
OPT
RITH1
LOAD
RELEASE
DETECTION
TO LOGIC
CONTROL
38381 FD
For more information www.linear.com3838-1
38381f
13
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