CAT3606

9

Doc. No. MD-5009 Rev. C

Characteristics subject to change without notice

TYPICAL CHARACTERISTICS

VIN = 3.6V, EN = VIN, ENM

RECOMMENDED LAYOUT

When the driver is in the 1.5x charge pump mode, the

1MHz switching frequency operation requires to

minimize trace length and impedance to ground on all 4

capacitors. A ground plane should cover the area on

the bottom side of the PCB opposite to the IC and the

bypass capacitors. Capacitors Cin and Cout require

short connection to ground which can be done with

multiple vias as shown on Figure 2. A square copper

area matches the QFN16 exposed pad (GND) and

must be connected to the ground plane underneath.

The use of multiple via will improve the heat dissipation.

Figure 2. PCB Layout

RSET Pin Voltage vs. Temperature

0

1

2

3

4

5

0

100

200

300

400

500

1x mode

1.16

1.18

1.20

1.22

1.24

-50

-25

0

2550

75100

125

TEMPERATURE [ºC]

OUTPUT CURRENT [mA]

Foldback Current Limiting

PWM Dimming at 1kHz on ENM and ENS