LT3579IUFD-1-PBF Просмотр технического описания (PDF) - Linear Technology

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LT3579IUFD-1-PBF

6A Boost/Inverting DC/DC Converter with Fault Protection

Linear Technology 

LT3579/LT3579-1

TYPICAL APPLICATION

500kHz SEPIC Converter Generates 3.3V from a 3V to 33V Input

VBAT

3V TO 33V (OPERATING)

6V TO 16V (START-UP)

200k

C1

10nF

D1

15V

Q1

D3

L1

• 3.3μH

CPWR

4.7μF

s2

M1

100k

CVIN

10μF

174k

SW1 SW2

VIN

FB

SHDN

GATE

LT3579

FAULT

VC

RT

CLKOUT

SYNC GND SS

C2

4.7μF

D2

D4

L2

3.3μH

10k

•

4.7nF

24.9k

100pF

8.25k

10k

VOUT

3.3V

1.8A (VBAT = 3V)

3.1A (VBAT = 9V)

3.4A (VBAT ≥ 12V)

COUT

47μF

s6

0.22μF

4.7nF

C1: 10nF, 16V, X7R, 0603

CVIN: 10μF, 16V, X7R, 1206

CPWR, C2: 4.7μF, 50V, X7R, 1210

COUT: 47μF, 6.3V, X7R, 1210

D1: CENTRAL SEMI CMHZ5245B-LTZ

D2: VISHAY SS5P6

D3: CENTRAL SEMI CMMSH2-40

D4: CENTRAL SEMI CMMSH2-40

L1, L2: WÜRTH WE-DD 744870003

M1: 2N7002

Q1: MMBT3904

3579 TA07a

Efficiency and Power Loss

90

4

80

3.5

70

3

60

50

VBAT = 3V

2.5

VBAT = 12V

2

40

1.5

30

1

20

0.5

10

0

0 0.5 1 1.5 2 2.5 3 3.5 4

LOAD CURRENT (A)

3579 TA08a

Transient Response with 9V to 33V to 9V VBAT Glitch (RLOAD = 1.5Ω)

VOUT

2V/DIV

VBAT

10V/DIV

IL1 + IL2

1A/DIV

50ms/DIV

3579 TA08b

35791f

32

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