LT3483IDC-TRPBF Просмотр технического описания (PDF) - Linear Technology

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LT3483IDC-TRPBF

Inverting Micropower DC/DC Converters with Schottky

Linear Technology 

LT3483/LT3483A

APPLICATIONS INFORMATION

Board Layout Considerations

As with all switching regulators, careful attention must

be given to the PCB board layout and component place-

ment. Proper layout of the high frequency switching path

is essential. The voltage signals of the SW and D pins

have sharp rising and falling edges. Minimize the length

and area of all traces connected to the SW and D pins.

In particular, it is desirable to minimize the trace length

to and from the flying capacitor, since current in this ca-

pacitor switches directions within a cycle. Always use a

ground plane under the switching regulator to minimize

interplane coupling.

Suggested Layout (DFN)

for Inverting Charge Pump

VOUT

GND

COUT

R1

1

2

3

4

8

7

9

6

5

CIN

L1

A

SHDN

K

VIN

CFLY

3483 AI02

Suggested Layout (SOT-23)

for Inverting Charge Pump

GND

CIN L1

CFLY

VIN

1

6

2

5

3

4

COUT

R1

VOUT

SHDN

3483 AI01

TYPICAL APPLICATIONS

VIN

3.6V

C1

4.7µF

3.6V to –22V DC/DC Converter

C2

L1

10µH

0.1µF

D1

SW

VIN

D

LT3483

SHDN FB

GND

RS

30Ω

R1

5pF 2.2M

VOUT

–22V

8mA

C3

1µF

C1: TAIYO YUDEN LMK316BJ475MD

C2: TAIYO YUDEN TMK107BJ104 (X5R)

C3: TAIYO YUDEN TMK316BJ105MD

D1: PHILIPS PMEG3002AEB

L1: MURATA LQH2MCN100K02L

3483 TA02a

3.6V to –22V Converter Efficiency and Power Loss

75

1000

EFFICIENCY

70

100

65

10

POWER

LOSS

60

1

55

0.1

1

LOAD CURRENT (mA)

0.1

10

3483 TA02b

3483fc

8

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