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L6924D013TR
Single Cell Li Ion battery Charger
September 2010 Doc ID 11908 Rev 9 1/38
L6924DBattery charger system with integrated
power switch for Li-Ion/Li-Polymer
Features Fully integrated solution, with a power
MOSFET, reverse blocking diode, sense
resistor, and thermal protection Ideal for coke and graphite anode single-cell LI-
ION packs Both linear and quasi-pulse operation Closed loop thermal control USB BUS-compatible Programmable charge current up to 1 A Programmable pre-charge current Programmable end-of-charge current Programmable pre-charge voltage threshold Programmable charge timer Programmable output voltage at 4.1 V and 4.2
V, with ± 1 % output voltage accuracy (NTC) or (PTC) thermistor interface for battery
temperature monitoring and protection Flexible charge process termination Status outputs to drive LEDs or to interface
with a host processor Small VFQFPN 16-leads package (3 x 3 mm)
Applications PDAs Handheld devices Cellular phones Digital cameras Standalone chargers USB-powered chargers
Table 1. Device summary
Contents L6924D2/38 Doc ID 11908 Rev 9
Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . 42.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74.1 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106.1 Linear mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2 Quasi-pulse mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Applications information: charging process . . . . . . . . . . . . . . . . . . . . 167.1 Charging process flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2 Pre-charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.3 Pre-charge voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.4 Fast charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.5 End-of-charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.6 Recharge flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.7 Recharge threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.8 Maximum charging time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.9 T ermination modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Application information: monitoring and protection . . . . . . . . . . . . . . 238.1 NTC thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.2 Battery absence detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.3 Status pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
L6924D ContentsDoc ID 11908 Rev 9 3/38
8.4 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Additional applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . 309.1 Selecting the input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9.2 Selecting the output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9.3 Layout guidelines and demonstration board description . . . . . . . . . . . . . 30
Application ideas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3410.1 USB battery charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Description L6924D
4/38 Doc ID 11908 Rev 9
1 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 2. Basis application schematic
Figure 1. Minimum application size
L6924D Pins description and connection diagrams
Doc ID 11908 Rev 9 5/38 Pins description and connection diagrams
Figure 3. Pins connection (top view)
2.1 Pin description
Table 2. Pin functions
