L6924D datasheet(24/38 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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24 / 38 page

Application information: monitoring and protection

L6924D

24/38

Application information: monitoring and protection

The L6924D uses a VFQFPN 3mm x 3mm 16-pin package with an exposed pad that allows the

user to have a compact application and good thermal behavior at the same time. The L6924D

has a low thermal resistance because of the exposed pad (approximately 75°C/W, depending

on the board characteristics). Moreover, a built-in thermal protection feature prevents the

L6924D from having thermal issues typically present in a linear charger.

Thermal Control is implemented with a thermal loop that reduces the charge current

automatically when the junction temperature reaches approximately 120°C. This avoids further

temperature rise and keeps the junction temperature constant. This simplifies the thermal

design of the application as well as protects the device against over-temperature damage.

The figure above shows how the thermal loop acts (with the dotted lines), when the junction

temperature reaches 120°C..

Figure 18. Power dissipation both linear and quasi pulse mode with thermal loop

L6924D Datasheet(PDF) 24 Page - STMicroelectronics