LTC3100
11
3100fb
For more information www.linear.com/LTC3100
BLOCK DIAGRAM
3100 BD
THERMAL
SHUTDOWN
+
+
+
MODE
CONTROL
1.5MHz
OSC
GATE
CONTROL
V
REF
VREF_GD
WELL
SWITCH
WELL
SWITCH
START-UP
START_OSC
CLK
TSD
V
BEST
V
BEST
GATE
DRIVERS
AND
ANTI-CROSS
CONDUCTION
GATE
DRIVERS
AND
ANTI-CROSS
CONDUCTION
SHUTDOWN
LOGIC
LOGIC
LOGIC
SHUTDOWN
C
IN
4.7礔
4M
C
IN
2.2礔
V
BATT1
, 0.65V TO 5V
4M
4M
C
OUT
10礔
V
BOOST
, 1.5V TO 5.25V
R2
R1
C
OUT
4.7礔
L1
3.3礖
L1, 3.3礖
V
BUCK
0.6V TO 5V
I
ZERO
COMPARATOR
I
ZERO
COMPARATOR
I
ZERO
I
LIM
I
SET
R6
FBBST
PGBST
V
LDO
V
BEST
OF 3
V
BST
VREF_GD
BURST
V
INBK
V
SEL
PAD
FBLDO
100mA
0.15
0.6V
RUNLDO
FROM V
BST
, V
BATT1
OR V
BATT2
V
INBK
SWBK
FBBK
V
INBST
V
REF
SWBST
V
BST
0.55V
GND
PGND
0.6V
VB
1.2V
FB
IPK
SLOPE
COMPARATOR
I
PK
COMPARATOR
I
PK
COMPARATOR
I
LIM
REF
I
SENSE
I
SENSE
WAKE
SOFT-START
ERROR
AMPLIFIER
R5
C
OUT
1礔
V
LDO
0.6V TO 5V
R4
R3
?/DIV>
?/DIV>
8
6
13
14
16
1
2
12
15
3
11
10
5
4
9
7
OFF ON
OFF ON
OFF ON
RUNBST
ERROR
AMPLIFIER
ERROR
AMPLIFIER/
SLEEP
COMPARATOR
TSD
1.1V
MODE
SLOPE
COMPARATOR
CLK
TSD
RUNLDO
RUNBK
PWM
PGBK
UVLO
SHUTDOWN
SHUTDOWN
LEVEL
SHIFT
CLAMP
V
BST
1M
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