LTC3565(RevA) Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC3565
(Rev.:RevA)

1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

Linear Technology 

Typical Application

General Purpose Buck Regulator Using Ceramic Capacitors

VIN

2.5V TO

5.5V

C1

22µF

RS1

BM

1M

FC

PS RS2

1M

R3

12.1k

SVIN

PVIN PGOOD

LTC3565 SW

SYNC/MODE

VFB

ITH

SHDN/RT

GND

C3

680pF

R5

100k

PGOOD

L1

2.2µH

R2 294k

1.8V

1.5V 1.2V

C4 22pF

R4

R1A R1B R1C

191k 147k 196k 294k

NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE

C1, C2: TAIYO YUDEN JMK325BJ226MM

L1: TOKO A914BYW-2R2M (D52LC SERIES)

LTC3565

VOUT

1.8V/1.5V/1.2V

AT 1.25A

C2

22µF

3565 TA02a

Efficiency vs Output Current

100

Burst Mode

90 OPERATION

80

70

PULSE SKIP

60

50

40

FORCED CONTINUOUS

30

20

10

0

0.1

VIN = 3.6V

VOUT = 1.2V

fO = 1MHz

1

10 100 1000 10000

OUTPUT CURRENT (mA)

3565 TA02b

VOUT

100mV/DIV

AC COUPLED

IL

1A/DIV

ILOAD

1A/DIV

40µs/DIV

VIN = 3.6V

VOUT = 1.2V

ILOAD = 100mA TO 1.25A

Burst Mode OPERATION

3565 TA02c

VOUT

100mV/DIV

AC COUPLED

IL

1A/DIV

ILOAD

1A/DIV

40µs/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 100mA TO 1.25A

PULSE SKIPPING MODE

3565 TA02d

FREQSET

STBYMD

FCB

ITH1

3565fa

19

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