MP3363

– SINGLE-STRING, 1.8V MINIMUM VIN, 36 VOUT BOOST LED DRIVER

MP3363 Rev. 1.0

MonolithicPower.com

12

9/28/2021

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its DC value, and ensures feedback loop

stability. The capacitance can be estimated with

Equation (9):













LOAD

OUT

IN

OUT

OUT

SW

OUT

I

(V

V )

C

V

f

V

(9)

PCB Layout Guidelines

Efficient

PCB

layout

is

critical for

stable

operation. For the best results, it is suggested

to refer to Figure 4 and follow the guidelines

below:

1. A

high-frequency

pulse

current

flows

through the loop between the SW pin,

output diode, output capacitor, and GND.

Keep this loop as short as possible to

reduce

noise

and

electromagnetic

interference.

2. Separate the PGND and AGND traces to

reduce

noise.

AGND

is

the

reference

ground of all the logic signals.

3. Connect PGND and AGND to the GND pin.

4. Place the ceramic input capacitor (CIN) as

close to the VIN pin as possible.

1

2

3

4

5

6

8

SW

VIN

COMP

EN/DIM

GND

FB

OSC/

SYNC

Top

Bottom

VIN

Bottom GND

L1

D1

C4

C2 C3

LED+

7

OVP

LED-

EN/DIM

SYNC

PGND

C1

C5

R1

R2

R3

R4

R5

AGND

Figure 4: Recommended PCB Layout