L6924D STMicroelectronics, L6924D Datasheet - Page 4

• Manufacturer Part Number: L6924D
• Description: IC BATTERY CHARGER SYS 16-VFQFPN
• Manufacturer: STMicroelectronics

Specifications of L6924D

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2.5 V ~ 12 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-VFQFN
• Product: Charge Management
• Output Current: 30 mA
• Operating Supply Voltage: 2.5 V to 12 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 497-8428 - BOARD EVAL CHARGER ST7260/L6924D497-8247 - BOARD EVAL FOR L6924UTR497-5504 - EVAL BOARD FOR L6924D
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Description
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Description
The L6924D is a fully monolithic battery charger dedicated to single-cell Li-Ion/Polymer
battery packs. It is the ideal solution for space-limited applications, like PDAs, handheld
equipment, cellular phones, and digital cameras. It integrates all of the power elements (the
power MOSFET, reverse blocking diode and the sense resistor) in a small VFQFPN16 (3 x 3
mm) package. When an external voltage regulated wall adapter is used, the L6924D works
in Linear Mode, and charges the battery in a constant current/constant voltage (CC/CV)
profile. Moreover, when a current-limited adapter is used, the device can operate in quasi-
pulse mode, dramatically reducing the power dissipation. Regardless of the charging
approach, a closed loop thermal control avoids device overheating. The device has an
operating input voltage ranging from 2.5 V to 12 V. The L6924D allows the user to program
many parameters, such as pre-charge current, fast-charge current, pre-charge voltage
threshold, end-of-charge current threshold, and charge timer. The L6924D offers two open
collector outputs for diagnostic purposes, which can be used to either drive two external
LEDs or communicate with a host microcontroller. Finally, the L6924D also provides very
flexible control of the charge process termination and Gas Gauge capability, as well as other
functions, such as checking for battery presence, and monitoring and protecting the battery
from unsafe thermal conditions.
Figure 1.
Figure 2.
Minimum application size
Basis application schematic
Doc ID 11908 Rev 9
L6924D