RT9516 RICHTEK [Richtek Technology Corporation], RT9516 Datasheet - Page 10

• Manufacturer Part Number: RT9516
• Description: Linear Single Cell Li-lon Battery Charger with Single Input Supply for Portable Applications
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9516
The maximum power dissipation at T
calculated by following formula :
P
WDFN-8L 2x2 package
The maximum power dissipation depends on operating
ambient temperature for fixed T
resistance
derating curves allows the designer to see the effect of
rising ambient temperature on the maximum power
allowed.
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10
D(MAX)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Figure 4. Derating Curves for RT9516 Package
0
= (125°C− 25°C) / (165°C /W) = 0.606W for
θ
JA
. For RT9516 package, the Figure 4 of
25
Ambient Temperature (°C)
50
WDFN-8L 2x2
75
J(MAX)
Single Layer PCB
A
= 25°C can be
and thermal
100
125
The connection of resistor should be
isolated from other noisy traces.
The short wire is recommended to
prevent EMI and noise coupling.
Layout Consideration
The RT9516 is a fully integrated low cost single-cell
Li-Ion battery charger ideal for portable applications.
Careful PCB layout is necessary. For best performance,
place all peripheral components as close to the IC as
possible. A short connection is highly recommended. The
following guidelines should be strictly followed when
designing a PCB layout for the RT9516.
The GND and exposed pad should be connected to a
The connection of R
Output capacitor should be placed close to the IC and
connected to ground plane. The trace of input in the
PCB should be placed far away from the sensitive devices
or shielded by the ground.
strong ground plane for heat sinking and noise protection.
noisy traces. The short wire is recommended to prevent
EMI and noise coupling.
connected to ground plane to reduce noise coupling.
Input capacitor should be placed close to IC and
GND
C
IN
Figure 5. PCB Layout Guide
R
SET
SET
GND
ISET
VIN
ABI
should be isolated from other
The capacitor should be
placed close to IC pin
and connected to ground
plane.
The GND should be connected to
a strong ground plane for heat
sinking and noise protection.
1
2
3
4
DS9516-01 April 2011
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7
6
5
8
BATT
PGOOD
EN
ABO
GND
C
OUT