IN

OUT

Charger

Accessory

powersupply

EN

DIS

Battery

pack

torestof

system

e.g.

cellphone

AC Adapter

bq24313

bq24315

IN

OUT

Charger

Accessory

powersupply

EN

DIS

Battery

pack

torestof

system

e.g.

cellphone

bq24313

bq24315

PCB Layout Guidelines:

bq24313

bq24315

Figure 24. Charging - The Red Arrows Show the Direction of Current Flow

Figure 25. Powering an Accessory - The Red Arrows Show the Direction of Current Flow

In the second case, when power is being delivered to an accessory, the bq24313/bq24315 device is required to

support current flow from the OUT pin to the IN pin.

range, the reverse current capability is the same as the forward capability, 1.5A. It should be noted that there is

no overcurrent protection in this direction.

• This device is a protection device, and is meant to protect down-stream circuitry from hazardous voltages.

Potentially, high voltages may be applied to this IC. It has to be ensured that the edge-to-edge clearances of

PCB traces satisfy the design rules for high voltages.

• The device uses SON packages with a PowerPAD™. For good thermal performance, the PowerPAD should

be thermally coupled with the PCB ground plane. In most applications, this will require a copper pad directly

under the IC. This copper pad should be connected to the ground plane with an array of thermal vias.

• C

located close to the IC.

Copyright © 2008, Texas Instruments Incorporated

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Product Folder Link(s): bq24313 bq24315