ltc3521fe Linear Technology Corporation, ltc3521fe Datasheet - Page 18

• Manufacturer Part Number: ltc3521fe
• Description: Ltc3521 Wide Vin, 1a Buck-boost Dc/dc And Dual 600ma Buck Dc/dc Converters Features
• Manufacturer: Linear Technology Corporation

LTC3521
Typical applicaTion

2V/DIV
2V/DIV
2V/DIV
2V/DIV
V
V
V
OUT1
OUT2
OUT3
V
IN
Converter Output Voltages
1.8V TO 5.5V
200mA
V
OUT1
3.3V
V
50µs/DIV
IN
Dual Supercapacitor to 3.3V at 200mA, 1.8V at 50mA and 1.2V at
+
+
1F
1F
C1
22µF
3521 TA02b
R2
221k
R1
1.0M
BURST
C4
4.7µF
OFF
100mA Backup Power Supply
PWM
4.7µH
L1
ON
SHDN1
SHDN2
SHDN3
SW1A
SW1B
V
FB1
PGND1
PWM
OUT1
PV
IN1
LTC3521
GND
PV
PGOOD1
PGOOD2
PGOOD3
PGND2
IN2
SW2
SW3
FB2
FB3
3521 TA02a
4.7µH
4.7µH
L2
L3
100
96
92
88
84
80
76
72
1.8
R3
137k
R4
68.1k
R5
100k
R6
100k
Efficiency vs V
2.8
C3
10µF
C2
10µF
V
IN
V
1.8V
50mA
V
1.2V
100mA
3.8
OUT2
OUT3
(V)
IN
V
I
V
I
OUT
OUT
V
I
OUT2
OUT1
OUT
OUT3
4.8
= 50mA
= 200mA
= 100mA
= 1.8V
= 3.3V
= 1.2V
3521 TA02c
3521f