STEVAL-ISA076V1 STMicroelectronics, STEVAL-ISA076V1 Datasheet - Page 23
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STEVAL-ISA076V1
Manufacturer Part Number
STEVAL-ISA076V1
Description
BOARD DEMO BATT CHRGR L6924D
Manufacturer
STMicroelectronics
Specifications of STEVAL-ISA076V1
Design Resources
STEVAL-ISA076V1 Bill of Materials STEVAL-ISA076V1 Gerber Files STEVAL-ISA076V1 Schematics
Featured Product
STM32 Cortex-M3 Companion Products
Main Purpose
Power Management, Battery Charger
Embedded
No
Utilized Ic / Part
L6924D
Primary Attributes
1 Cell- Li-Ion / Li-Pol, 4.1V or 4.2V @ 1A, 12V Input
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Secondary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-11036
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA076V1
Manufacturer:
STMicroelectronics
Quantity:
1
L6924D
8
Figure 18. Power dissipation both linear and quasi pulse mode with thermal loop
8.1
Application information: monitoring and protection
The L6924D 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 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
temperature reaches 120°C.
NTC thermistor
The device allows designers to monitor the battery temperature by measuring the voltage
across an NTC or PTC resistor. Li-Ion batteries have a narrow range of operating
temperature, usually from 0°C to 50 °C. This window is programmable by an external divider
which is comprised of an NTC thermistor connected to GND and a resistor connected to
V
(internal window comparator), the device stops the charge process, and indicates a fault
condition through the status pin.
REF
Figure 18
. When the voltage on the TH pin exceeds the minimum or maximum voltage threshold
shows how the thermal loop acts (with the dotted lines), when the junction
Doc ID 11908 Rev 9
Application information: monitoring and protection
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