L6924D datasheet(12/38 Pages) STMICROELECTRONICS

Part #	L6924D

Description	Battery charger system with integrated power switch for Li-ION/Li-POLYMER

PDF	38 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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12 / 38 page

Operation description

L6924D

12/38

When the VPRE pin is not used to program the Pre-Charge voltage threshold, it has two

different functions:

●

If the voltage across VPRE pin is lower than 0.8V, when I < IENDTH, the end of charge in

notified by the status pin, but the charging process is not disabled. The charge process

ends when the maximum charging time expires.

●

If pin VPRE goes lower than 0.5V the timer is reset on the falling edge.

Battery disconnection control is provided thanks to the differentiated sensing and forcing output

pins. A small current is sunk and forced through VOUT. If VOSNS doesn’t detect the battery, the

IC goes into a standby mode.

Figure 5 shown the real charging profile of a Li-Ion battery, with a Fast Charge current of

450mA (RPRG = 26KΩ),

Figure 5.

Li-Ion charging profile

Charging profile

0.00 0

0.05 0

0.10 0

0.15 0

0.20 0

0.25 0

0.30 0

0.35 0

0.40 0

0.45 0

0.50 0

2 00

400

60 0

8 00

10 00

1 200

Charging tim e (sec )

0.00 0

0.50 0

1.00 0

1.50 0

2.00 0

2.50 0

3.00 0

3.50 0

4.00 0

4.50 0

Ichg

Vb att

L6924D Datasheet(PDF) 12 Page - STMicroelectronics

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