LTC3101 Linear Technology, LTC3101 Datasheet - Page 28

• Manufacturer Part Number: LTC3101
• Description: Multi-Output DC/DC Converter and PowerPath Controller
• Manufacturer: Linear Technology

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LTC3101
C
28
TYPICAL APPLICATIONS
RS
V
V
V
OUT1
OUT2
OUT3
HSO 5V/DIV
100mV/DIV
PWRKEY
5V/DIV
2V/DIV
2V/DIV
5V/DIV
Waveforms During Power-Up
WALL ADAPTER
4.3V TO 5.5V
4.0V TO 5.5V
USB POWER
2 AA Cell/USB/Wall Adapter Power Supply with Six Output Rails and Pushbutton On/Off
5ms/DIV
C1-C5: MURATA GRM31CR71A106KA01
L1, L2: TAIYO YUDEN NR3010T4R7M
L3: COILCRAFT LPS4018-472ML
V
OUT1
μP
CELLS
2 AA
+
R1
50k
3101 TA02b
ON/OFF
C5
10μF
0.22μF
R2
50k
C4
10μF
BAT1
USB1
USB2
C
PWRKEY
PBSTAT
PWRON
RESET
PWM
RS
100
80
70
60
40
90
50
30
20
10
0
BAT2 SW3A
1
Buck-Boost Converter Effi ciency
OPERATION
Burst Mode
LTC3101
GND
L3
4.7μH
vs Load Current
LOAD CURRENT (mA)
SW3B OUT3
10
PWM MODE
ENA3
ENA2
ENA1
MAX
SW2
SW1
HSO
LDO
FB3
FB2
FB1
4.7μH
4.7μH
100
C3
10μF
L2
L1
221k
221k
147k
R6
R4
R3
V
V
BAT
BAT
R8
1M
R7
221k
3101 TA02c
R5
110k
C8
4.7μF
C7
4.7μF
3101 TA02a
= 2V
= 3V
1000
C9
22pF
C10
22pF
V
300mA FOR V
800mA FOR V
OUT3
C6
4.7μF
100
= 3.3V
80
70
60
40
90
50
30
20
10
0
1
C2
10μF
C1
10μF
OPERATION
Burst Mode
IN
IN
≥ 1.8V
≥ 3V
vs Load Current, V
Buck Converter Effi ciency
Hot Swap OUTPUT
3.3V
100mA
TRACKING OUTPUT
200mA
1.8V
50mA
V
1.8V
350mA
V
1.5V
350mA
OUT2
OUT1
PWM MODE
LOAD CURRENT (mA)
10
100
BAT
BUCK1 (1.5V)
BUCK2 (1.8V)
= 3V
3101 TA02d
3101f
1000