LTC3118_15 Datasheet, PDF (11/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

Block Diagram
LTC3118
V_IN1 2.2V TO 18V
V_IN2 2.2V TO 18V
L
V_OUT 2V TO 18V
V_IN2
V_IN1
V_CC
BST1
CM2
A FETs
AND DRIVERS
CM1
SW1
SW2 V_OUT BST2
V_CC
CP1 CP2
PGND
V_CC
BDRV
I_SWA
I_SWB
B
D
DDRV
V_CC
C
CDRV
CP2
V_IN2
V_CC ^SEL2
CN2 _PMP2
CLK
–200mA
ADRV BDRV
CDRV DDRV
DRIVERS
I_SENSE
CP1
V_IN1 ^ISWA
V_CC ^SEL1
I_SWB
CN1
PMP1
CLK
+
I_SENSE
–^IREV
+
6A –^IPEAK
SWITCH
COMMANDS
BURST
UVLO
RUN
V_IN1
+
–
V_IN2
+
2V
–
2.35V
V_CC
GND
I_SENSE
R_CS
AVERAGE
CURRENT
AMPLIFIER
FB
g_m
1V
1.2MHz RAMPS/
OSCILLATOR
SOFT-START
RAMP
VC
PWM
COMPARATOR
V_IN1
V_IN2
3.8V REGULATOR
V_CC
1.22V REFERENCE
FB +
0.92V –
PGD
V1GD
V_SELECT
V_IN1GOOD
V_IN1GOO2
IDEAL DIODE
MODE
V_IN1GOOD
V1_PRIORITY
MODE
V_IN2GOOD
V2GD
SEL
RUN1
RUN/SD
RUN2
1.22V
MODE
R1
C_OUT
R2
UP TO 18V
3118 BD
For more information www.linear.com/LTC3118
3118f
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