CAT3604
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, unless otherwise specified.
Foldback Current Limiting
5
1x mode
4
3
2
1
0
0
100
200
300
OUTPUT CURRENT [mA]
400
500
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
onall4capacitors. Agroundplaneshouldcoverthe
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) which is connected by a trace to the pin
12pad(GND).Alargevia(metalizedhole)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.
0.65 mm
2.25 mm
0.35 mm
Figure 3: Recommended QFN 16 Package Land Pattern
Figure 2: PCB Layout
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 5008, Rev. I
9
CATALYST [ CATALYST SEMICONDUCTOR ]
