LTC3442 Просмотр технического описания (PDF) - Linear Technology

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LTC3442

Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation

Linear Technology 

LTC3442

TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise specified).

Frequency Change

vs Temperature (Normalized)

2.0%

1.5%

1.0%

0.5%

0.0%

–0.5%

–1.0%

–1.5%

–2.0%

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

3442 G13

Switch Pins in Buck-Boost Mode

Feedback Voltage

vs Temperature (Normalized)

1.0%

0.8% VIN = VOUT = 3.3V

0.6%

0.4%

0.2%

0.0%

Switch Pins Before Entering

Boost Mode

SW1

2V/DIV

SW2

2V/DIV

–2.0%

–0.4%

–0.6%

–0.8%

50ns/DIV

VIN = 2.9V

VOUT = 3.3V AT 500mA

3442 G15

–1.0%

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

3442 G14

Switch Pins Entering

Buck-Boost Mode

Output Ripple at 1A Load

SW1

2V/DIV

SW2

2V/DIV

50ns/DIV

VIN = 3.3V

VOUT = 3.3V AT 500mA

SW1

2V/DIV

SW2

2V/DIV

3442 G16

50ns/DIV

VIN = 4.2V

VOUT = 3.3V AT 500mA

VIN = 2.7V

VIN = 3.3V

VIN = 4.2V

3442 G17

VOUT

20mV/DIV

AC COUPLED

1µs/DIV

3442 G18

Load Transient Response in Fixed

Frequency Mode, No Load to 1A

Load Transient Response in Auto

Burst Mode Operation, No Load to 1A

Burst Mode Operation

VOUT

100mV/DIV

VOUT

100mV/DIV

VOUT

50mV/DIV

LOAD

0.5A/DIV

100µs/DIV

VIN = 3.6V

VOUT = 3.3V

COUT = 47µF, X5R CERAMIC

3442 G19

LOAD

0.5A/DIV

INDUCTOR

CURRENT

0.5A/DIV

100µs/DIV

VIN = 3.6V

VOUT = 3.3V

COUT = 47µF, X5R CERAMIC + 100µF

LOW ESR TANTALUM

3442 G20

20µs/DIV

COUT = 100F

LOW ESR TANTALUM

3442 G21

For more information www.linear.com/LTC3442

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