L6924U datasheet(23/38 Pages) STMICROELECTRONICS

部件名	L6924U

功能描述	USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer

PDF	38 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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23 / 38 page

L6924U

Application information: monitoring and protection

23/38

Application information: monitoring and protection

The L6924U uses a VFQFPN 3 mm x 3 mm 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 L6924U 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 L6924U 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 16.

Power dissipation both linear and quasi pulse mode with thermal loop

L6924U 数据表(PDF) 23 Page - STMicroelectronics