LTC3537 Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC3537

2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO

Linear Technology 

LTC3537

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.

Fixed Frequency Switching

Waveform and VOUTB Ripple

Burst Mode Waveforms

VOUTB and IINB During Soft-Start

SW

2V/DIV

VOUTB

20mV/DIV

VOUTB

20mV/

DIV

IL

10mA/DIV

VINB = 2.4V

VOUTB = 3.3V

COUTB = 4.7μF

200ns/DIV

3537 G19

Load Current Step Response

(from Burst Mode Operation)

VINB = 2.4V

VOUTB = 3.3V

COUTB = 10μF

10μs/DIV

3537 G20

Load Current Step Response

(Fixed Frequency)

ENBST

VOUTB

2V/DIV

IVINB

200mA/

DIV

VINB = 1.2V

VOUTB = 3.3V

COUTB = 4.7μF

ILOAD = 10mA

100μs/DIV

3537 G21

Load Current Step Response

(Fixed Frequency)

VOUTB

100mV/

DIV

VOUTB

100mV/

DIV

VOUTB

100mV/

DIV

ILOAD

100mA/

DIV

ILOAD

100mA/

DIV

ILOAD

100mA/

DIV

VINB = 2.4V

VOUTB = 3.3V

COUTB = 4.7μF

100μs/DIV

3537 G22

Load Current Step Response

(from Burst Mode Operation)

VOUTB

100mV/

DIV

ILOAD

100mA/

DIV

VINB = 3.6V

VOUTB = 5V

COUTB = 4.7μF

100μs/DIV

3537 G25

VINB = 2.4V

VOUTB = 3.3V

COUTB = 4.7μF

100μs/DIV

3537 G23

LDO Dropout Voltage vs

Load Current

140

120

100

80

60

40

20

0

0 10 20 30 40 50 60 70 80 90 100

LOAD CURRENT (mA)

3537 G26

VINB = 3.6V

VOUTB = 5V

COUTB = 4.7μF

100μs/DIV

3537 G24

LDO Input Ripple Rejection vs

Frequency

60

VINL = 3.3V

VOLDO = 3V

50

COLDO = 4.7μF

ILOAD = 50mA

40

30

20

10

0

0.01

0.1

1

10

FREQUENCY (kHz)

100

3537 G29

3537fd

7

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