ADP1653

Rev. A | Page 20 of 24

INDUCTOR

GND

L1

C1

INPUT CAPACITOR

C2

OUTPUT CAPACITOR

SCHOTTKY DIODE

D1

HIGH-POWER

LED

D3

HIGH-POWER

LED

D2

INDICATOR LED

D4

SETT RESISTOR

R6

SETF RESISTOR

R5

TxMASK RESISTOR

R4

SETI RESISTOR

R7

ADP1653

AGND PLANE

PGND PLANE

PGND

PGND

CONNECT AGND TO PGND CLOSE TO IC. THIS IS THE GND RETURN PATH FOR HPLED CURRENT,

SO A REASONABLY LARGE VIA SHOULD BE USED TO CONNECT AGND TO PGND PLANE.

Figure 34. Example Layout of ADP1653 Driving Two White LEDs, Pink = GND Layer, Gray/Green = Top Layer (a One-LED Layout Is Similar)

16

15

14

13

5

6

7

8

12

11

10

9

1

2

3

4

ADP1653

4.7µF

4.7µF

ONE

OR

TWO

LEDs

2.2µH

INPUT VOLTAGE = 2.75V TO 5.5V

Tx MASK

OPTIONAL

SETT

SETF

CTRL1/SCL

CTRL0/SDA

EN

STR

LX

SETI ILED

OUT

GND

PGND

INTF

HPLED

INT

Figure 35. Typical Applications Circuit (High Current Lines Are Shown in Bold)