LTC3100
22
3100fb
For more information www.linear.com/LTC3100
TYPICAL APPLICATIONS
Single-Cell Boost and Buck with Voltage Sequencing
Output Voltages During Soft-Start
for Sequenced Converter
SWBST V
INBK
V
BST
LTC3100
FBBST
L1
3.3礖
3.5V
R2
1M
R1
523k
C1
10礔
?
C
IN
2.2礔
V
LDO
V
INBST
FBLDO
SWBK
PGBK
PGBST
R4
115k
R3
25.5k
V
BATT
0.9V TO 1.5V
C2
2.2礔
FBBK
12
3
11
4
16
15
9
R6
1M
R5
1M
C3
10礔
MODE
RUNBST
RUNLDO
RUNBK GND
16
13
14
10
8
1 5 2
7
FF EN_BURST
OFF ON
L2
3.3礖
+3.3V AT 50mA
V_I/O
120mA AT V
BATT
= 0.9V
220mA AT V
BATT
= 1.2V
V_CORE = 1.2V
BOOST_GOOD
BUCK_GOOD
R7
1M
R8
1M
+
3100 TA02b
1ms/DIV
V
CORE
, 1V/DIV
V
BST
, 1V/DIV
V
I/O
, 1V/DIV
SWBST V
INBK
V
BST
LTC3100
FBBST
BOOST
L1
3.3礖
R2
2M
R1
634k
C1
10礔
?
C2
2.2礔
C
IN
4.7礔
V
LDO
V
INBST
FBLDO
SWBK
PGBK
PGBST
V
IN
2.5V TO 5V
Li-Ion
FBBK
12
3
11
4
16
15
9
R6
976k
R5
487k
C3
10礔
3100 TA03a
MODE
RUNBST
RUNLDO
RUNBK GND
16
13
14
10
8
1 5 2
7
OFF ON
LDO
BUCK
OFF ON
OFF ON
L2
4.7礖
+5V AT 200mA
V
BOOST
R4
115k
R3
25.5k
+3.3V AT
50mA
V_I/O
+1.8V AT
250mA
V_CORE
BOOST_GOOD
BUCK_GOOD
R7
100k
R8
100k
C
FF2
10pF
Li-Ion Input, Triple Output Converter
Efficiency vs Load Current
LOAD CURRENT (mA)
30
50
80
0.01
10 100 1000
0
10
0.1 1
100
70
90
40
60
20
100
0.01
1000
1
10
0.1
3100 TA03b
1.8V BUCK
5V BOOST
BUCK POWER LOSS
BOOST POWER LOSS
V
IN
= 3.6V
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