RT9526AGQW 데이터 시트보기 (PDF) - Richtek Technology
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RT9526AGQW
Richtek Technology
RT9526AGQW Datasheet PDF : 10 Pages
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RT9526A
PD(MAX) = (125°C − 25°C) / (120°C/W) = 0.833W for
WDFN-8L 2x3 package
The maximum power dissipation depends on the operating
ambient temperature for fixed TJ(MAX) and thermal
resistance, θJA. For the RT9526A packages, the derating
curves in Figure 3 allow the designer to see the effect of
rising ambient temperature on the maximum power
dissipation.
0.9
Four-Layer PCB
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 3. Derating Curve for RT9526A Package
Layout Consideration
The RT9526A 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 RT9526A.
` Input capacitor should be placed close to the IC and
connected to the ground plane. The trace of input on
the PCB should be placed far away from the sensitive
devices and shielded by the ground.
` The GND and exposed pad should be connected to a
strong ground plane for heat sinking and noise protection.
` The connection of RISET should be isolated from other
noisy traces.
` Output capacitor should be placed close to the IC and
connected to the ground plane to reduce noise coupling.
R1
BATT
BATT
R2
CIN should be placed near the
IC to improve performance.
VIN
BATT
CIN COUT
The copper area connecting the
resistors of ISET and IMIN should
be minimized and kept far away
from noise sources.
VIN 1
PGB 2
CHG_SB 3
ENB 4
8 BATT RISET
7 ISET
9
6 IMIN
5 GND
RIMIN
GND
The GND plane should be connected to a strong
ground plane for heat sinking and noise protection.
Figure 4. PCB Layout Guide
DS9526A-01 April 2011
www.richtek.com
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