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EVAL6924D
EVAL6924D Battery charger system with integrated Power Switch for Li-ION/Li-POLYMER
Data Brief
General 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 is designed with BCD6 technology and integrates all of the power elements (the Power MOSFET, reverse blocking diode and the sense resistor) in a small VFQFPN16 3mm x 3mm 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 2.5V to 12V and it 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. The EVAL6924D Evaluation Board integrates the linear battery charger as well as the external components required for a typical application. The input voltage range can be adjusted between 2.5V and 12V, while the output voltage is selected by J4, between 4.1V and 4.2V, depending on the battery type. The fast charge current is set to 500 mA through the 24K R5 resistor.
Evaluation board
November 2006
Rev 1
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Features
EVAL6924D
1
Features
Figure 1. Evaluation board schematic
R3 R9 C4 CHARGER V IN C1 V INSNS R1 R2 T PRG C2 LD1 LD2 J2 ST2 ST1 J1 SHDN GND J3 V OPRG J4 I PRE R6 R10 V PRE J5 R5 R4 V REF NTC TH V OUT V OSNS I END I PRG C3 BATTERY
L6924D
C
Vref R7 R8
Table 1.
Name R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 C1 C2 C3 C4 LD1
Evaluation board part list
Value 1K 1K 1K 3K3 24K N.M N.M 68K 470R N.M 1F 10nF 1F 1F GREEN Description Pull up resistor. To be used when the ST1s connected with a LED Pull up resistor. To be used when the ST1s connected with a LED Pull up resistor. Connected between VREF and TH pin End of charge current resistor. Used to set the termination current and, as a "Gas Gauge" when measuring the voltage across on it. Fast-charge current resistor. Used to set the charging current VPRETH resistor. Used to set programmable pre-charge voltage threshold. If not mounted, the VPRETHDefault, equal to 2.8V, is set IPRETH resistor. Used to set programmable pre-charge voltage threshold below the default one. If not mounted, the IPRETHDefault, is set IPRETH resistor. Used to set programmable pre-charge current threshold above the default one. If not mounted, the IPRETHDefault, is set If a NTC is not used, a half value of R3 must be mounted to keep the TH voltage in the correct window It has the same function of R6. Moreover, if it is replaced with a short-circuit, when J5 is closed, the timer is reset (falling edge) Input capacitor TMAX capacitor. Used to set the maximum charging time Output capacitor VREF filter capacitor. Not mounted ST1 LED
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EVAL6924D Figure 2. Package - VFQFPN16
Revision history
2
Revision history
Table 2.
Date 21-Nov-2006
Revision history
Revision 1 First issue Changes
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EVAL6924D
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