RT9524 データシートの表示（PDF） - Richtek Technology

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RT9524

Linear Single Cell Li-Ion Battery Charger IC for Portable Applications

Richtek Technology 

in Figure 4 allows the designer to see the effect of rising

ambient temperature on the maximum power dissipation.

1.2

Four-Layer PCB

1.0

0.8

0.6

0.4

0.2

0.0

0

25

50

75

100

125

Ambient Temperature (°C)

Figure 4. Derating Curve for RT9524 Package

RT9524

The capacitor should be

placed close to IC pin and

connected to ground plane.

The connection of

resistor should be

isolated from other

noisy traces. Short

wire is recommended

to prevent EMI and

noise coupling.

CIN

RISET

RIEOC

VIN 1

ISET 2

GND 3

LDO 4

IEOC 5

10 BATT

9 PGB

8 CHGSB

7 GND

11 6 EN/SET

COUT

GND

The GND should be connected to a strong

ground plane for heat sinking and noise

protection.

Figure 5. PCB Layout Guide

Layout Consideration

The RT9524 is a fully integrated low cost single-cell Li-

Ion battery charger IC 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 RT9524.

` Input 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.

` The GND should be connected to a strong ground plane

for heat sinking and noise protection.

` The connection of RISET and RIEOC should be isolated

from other noisy traces. The short wire is recommended

to prevent EMI and noise coupling.

` Output capacitor should be placed close to the IC and

connected to ground plane to reduce noise coupling.

DS9524-01 April 2011

www.richtek.com

11

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