LTC3101
TYPICAL APPLICATIONS
Li-Ion/USB-Powered Six Output Power Supply with Pushbutton Control
V
= 3.3V
OUT3
300mA FOR V ≥ 1.8V
IN
+
C4
10μF
C3
10μF
Li-Ion
1.8V TO 4.2V
800mA FOR V ≥ 3V
IN
R3
1M
L3
4.7μH
R4
221k
BAT1 BAT2 SW3A SW3B OUT3
USB POWER
4.3V TO 5.5V
USB1
USB2
FB3
HSO
Hot Swap OUTPUT
C2
10μF
3.3V
C5
4.7μF
100mA
TRACKING OUTPUT
200mA
MAX
ENA3
ENA2
ENA1
C1
0.22μF
C6
4.7μF
C
RS
1.8V
LDO
50mA
LTC3101
C7
4.7μF
L2
ON/OFF
4.7μH
V
OUT2
SW2
FB2
1.2V
PWRKEY
C9
R5
221k
C8
350mA
10μF
V
22pF
OUT2
R6
221k
R1
50k
R2
50k
L1
4.7μH
V
OUT1
PBSTAT
PWRON
RESET
PWM
0.8V
SW1
FB1
C11
22μF
R7
C10
22pF
350mA
μP
221k
R8
GND
649k
L1, L2: WURTH 744031004
L3: TAIYO YUDEN NR4018T4R7M
3101 TA04a
Buck-Boost Efficiency
vs Load Current
Buck Converter 1 Efficiency
vs Load Current
Buck Converter 2 Efficiency
vs Load Current
100
90
100
90
100
90
Burst Mode
OPERATION
Burst Mode
OPERATION
Burst Mode
OPERATION
80
70
60
80
70
60
80
70
60
PWM MODE
PWM MODE
PWM MODE
50
40
50
40
50
40
30
20
10
0
30
20
10
0
30
20
10
0
V
V
= 3.0V
V
V
= 3.0V
= 4.2V
V
V
= 3.0V
= 4.2V
BAT
BAT
BAT
BAT
BAT
BAT
= 4.2V
1
100
LOAD CURRENT (mA)
1000
1
100
LOAD CURRENT (mA)
1000
10
10
1
100
LOAD CURRENT (mA)
1000
10
3101 TA02c
3101 TA04d
3101 TA04b
3101f
30
Linear [ Linear ]
