LTC3521 查看數據表（PDF） - Linear Technology

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产品描述 (功能)

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LTC3521

1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

Linear Technology 

Typical Application

Dual Supercapacitor to 3.3V at 200mA, 1.8V at 50mA and 1.2V at

100mA Backup Power Supply

LTC3521

VIN

1.8V TO 5.5V

+

+

1F

1F

VOUT1

3.3V

200mA

C1

22µF

C4

L1

4.7µF 4.7µH

R1

1.0M

R2

221k

ON

OFF

PWM

BURST

PVIN1 VIN PVIN2

SW1A

SW2

L2

4.7µH

SW1B

FB2

VOUT1

LTC3521

FB1

SHDN1

SW3

SHDN2

SHDN3

FB3

PGOOD1

PWM

PGOOD2

PGND1A PGOOD3

PGND1B GND PGND2

L3

4.7µH

3521 TA02a

R3

137k

R4

68.1k

R5

100k

R6

100k

VOUT2

1.8V

C2 50mA

10µF

VOUT3

1.2V

C3 100mA

10µF

Converter Output Voltages

VIN

2V/DIV

VOUT1

2V/DIV

VOUT2

2V/DIV

VOUT3

2V/DIV

50µs/DIV

3521 TA02b

100

96

92

88

84

80

76

72

1.8

Efficiency vs VIN

VOUT1 = 3.3V

IOUT = 200mA

VOUT3 = 1.2V

IOUT = 100mA

VOUT2 = 1.8V

IOUT = 50mA

2.8

3.8

VIN (V)

4.8

3521 TA02c

For more information www.linear.com/LTC3521

3521fb

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