Datasheet > AN-9720

AN-9720

更新时间： 2024-01-03 23:03:10

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飞兆/仙童 - FAIRCHILD		/
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Power Path Implementation Tradeoffs

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AN-9720 数据手册

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AN-9720

Power Path Implementation Tradeoffs, Featuring the

FAN5400 Family of PWM Battery Chargers

Overview

Many battery-powered systems, such as smart phones, must be

fully functional and their electronics up and running shortly

after the user plugs a charger into the phone. The system

electronics need to be functional regardless of the state of the

battery, even if the battery is fully discharged or absent. The

FAN5400 family charger IC allows power to be delivered to

the system when the charger is plugged in, whether the battery

is absent or present, and allows the system to power up and be

functional quickly after the charger is plugged in. Other

approaches, such as power path, add additional impedance in

series with the battery.

While this implementation meets the criteria for power path,

an ideal diode is never truly ideal. For example, the internal

ideal diode of one such IC is actually a PMOS with a typical

value of 180mΩ. This means that there is a permanent 180mΩ

power dissipating series element between battery and system

load that creates significant additional power loss during

periods of high-current drain from the battery, such as GSM

pulses. A parallel diode PMOS switch can reduce this

resistance; however, this increases the solution size and cost.

The implementation in Figure 1 differs from the FAN540X

approach in the block diagram in Figure 2. Although on the

surface it may seem like FAN5400 does not have power path

functionality; it serves almost all the same needs and, in

addition, can provide the benefit of having no power

dissipating series element between system load and battery.

This application note describes how the FAN5400 family of

battery chargers distributes power between the system and

battery to achieve similar results of power path, often without

the overhead and power loss of an additional switch element.

The block diagram in Figure 1 is a typical implementation of

power path using an “ideal” diode. Current flow is indicated

by the arrows, which reveal that the “ideal” diode (whether

internal or external) helps to steer current appropriately.

Figure 1. Typical Implementation of Power Path using an “Ideal” Diode

Rev. 1.0.0 • 12/23/10

www.fairchildsemi.com

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