EVAL6924D [STMICROELECTRONICS]
EVAL6924D Battery charger system with integrated Power Switch for Li-ION/Li-POLYMER; EVAL6924D电池充电器系统，集成电源开关，用于锂离子/锂聚合物
| 型号： | EVAL6924D |
| 厂家： | 
ST |
| 描述： | EVAL6924D Battery charger system with integrated Power Switch for Li-ION/Li-POLYMER |
| 文件： | 总4页 (文件大小：115K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVAL6924D
EVAL6924D Battery charger system
with integrated Power Switch for Li-ION/Li-POLYMER
Data Brief
many parameters, such as pre-charge current,
General description
fast-charge current, pre-charge voltage threshold,
end-of-charge current threshold, and charge
timer.
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.
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.
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 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.
The device has an operating input voltage ranging
from 2.5V to 12V and it allows the user to program
Evaluation board
November 2006
Rev1
1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Features
EVAL6924D
1
Features
Figure 1.
Evaluation board schematic
R9
R3
C4
NTC
VREF
TH
CHARGER
VIN
VOUT
BATTERY
VOSNS
C1
VINSNS
TPRG
I
END
R1
R2
I
C3
PRG
C2
L6924D
LD1
LD2
J2
R4
ST2
ST1
VPRE
R5
J5
J1
SHDN
GND VOPRG
J3
I
PRE
R6
R10
J4
∝C
Vref
R7
R8
Table 1.
Name
Evaluation board part list
Value
Description
R1
R2
R3
1K
1K
1K
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.
R4
R5
R6
3K3
24K
N.M
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
R7
N.M
68K
IPRETH resistor. Used to set programmable pre-charge current threshold above
the default one. If not mounted, the IPRETHDefault, is set
R8
If a NTC is not used, a half value of R3 must be mounted to keep the TH
voltage in the correct window
R9
470R
N.M
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)
R10
C1
C2
C3
C4
LD1
1µF
10nF
1µF
1µF
Input capacitor
TMAX capacitor. Used to set the maximum charging time
Output capacitor
VREF filter capacitor. Not mounted
GREEN ST1 LED
2/4
EVAL6924D
Revision history
Figure 2.
Package - VFQFPN16
2
Revision history
Table 2.
Date
21-Nov-2006
Revision history
Revision
Changes
1
First issue
3/4
EVAL6924D
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