Operation description

L6924D

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Neglecting the voltage drop across the charger (

∆V

condition, its input voltage is equal to the battery one, and so a very low operating input voltage

(down to 2.5V) is required. The power dissipated by the device during this phase is:

When the battery voltage approaches the final value, the charger gets back the control of the

current, reducing it. Due to this, the upstream adapter exits the current limit condition and its

In conclusion, the advantage of the linear charging approach is that the designer has the direct

control of the charge current, and consequently the application can be very simple. The

drawback is the high power dissipation.

The advantage of the Quasi-Pulse charging method is that the power dissipated is dramatically

reduced. The drawback is that a dedicated upstream adapter is required.

2

)

(

LIM

on

DS

CH

I

R

P

×

=

Eq: 7-4

LIM

BAT

ADP

DIS

I

V

V

P

×

−

=

)

(

Eq: 7-5