RT9526AGE datasheet(9/10 Pages) RICHTEK

9 / 10 page

RT9526A

DS9526A-01 April 2011

www.richtek.com

Figure 4. PCB Layout Guide

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.

Figure 3. Derating Curve for RT9526A Package

ISET

VIN

ENB

PGB

BATT

GND

CHG_SB

IMIN

BATT

VIN

BATT

COUT

CIN

RISET

RIMIN

GND

CIN should be placed near the

IC to improve performance.

The copper area connecting the

resistors of ISET and IMIN should

be minimized and kept far away

from noise sources.

The GND plane should be connected to a strong

ground plane for heat sinking and noise protection.

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

100

125

Ambient Temperature (°C)

Four-Layer PCB

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.

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