CAT3604 datasheet(9/11 Pages) CATALYST

9 / 11 page

CAT3604

Doc. No. 5008, Rev. I

Characteristics subject to change without notice

TYPICAL CHARACTERISTICS

IN = 3.6V, EN = VIN, CIN = COUT = 1µF, unless otherwise specified.

Foldback Current Limiting

100

200

300

400

500

OUTPUT CURRENT [mA]

1x mode

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

Figure 2: PCB Layout

square copper area matches the QFN16 exposed

pad (GND) which is connected by a trace to the pin

12 pad (GND). A large via (metalized hole) centered

in the square pad provides a low impedance

connection to the ground plane on the opposite

side of the PCB and allows the heat dissipated by

the driver IC to spread out resulting in excellent

thermal performance.

Figure 3: Recommended QFN 16 Package Land Pattern

2.25 mm

0.35 mm

0.65 mm

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