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PDF ACE4054 Data sheet ( Hoja de datos )
| Número de pieza | ACE4054 | |
| Descripción | Fully integrated constant current/constant voltage Li-ion battery charger | |
| Fabricantes | ACE Technology | |
| Logotipo |  |
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ACE4054
Technology
Fully integrated constant current/constant voltage
Li-ion battery charger
Description
The ACE4054 is a single cell, fully integrated constant current (CC) / constant voltage (CV) Li-ion battery
charger. Its compact package with minimum external components requirement makes the ACE4054 ideal
for portable applications.
No external sense resistor or blocking diode is necessary for the ACE4054. Build-in thermal feedback
mechanism regulates the charge current to control the die temperature during high power operation or at
elevated ambient temperature.
The ACE4054 has a pre-charge function for trickle charging deeply discharged batteries. The fast
charge current can be programmed by an external resistor. CV regulation mode is automatically enabled
once the battery’s charging curve reaches the constant voltage portion. The output current then decays
and is finally terminated once the charge current drops to 1/10th of the programmed value. The ACE4054
keeps monitoring the battery voltage and enables a new charge cycle once the voltage drops by 150mV
below the CV value.
Power supply state is constantly monitored and the battery drain current is reduced to minimum value
automatically when the ACE4054 sensed a lack of input power. In its shutdown mode, the ACE4054 can
reduce the supply current to less than 25μA. A status pin outputs a logic HIGH/LOW to indicate the
charging status and the presence of power supply.
Other features include charge current monitor, under-voltage lockout.
Features
• Standalone Capability with no Requirement of External MOSFET, Sense Resistor or Blocking Diode
• Complete Linear Charger in Compact Package for Single Cell Lithium-Ion Batteries
• Programmable Pre-charge, Fast Charge and Termination Current
• Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate
Without Risk of Overheating
• Charges Single Cell Li-Ion Batteries Directly from USB Port
• Preset 4.2V Charge Voltage with ±1% Accuracy
• Automatic Recharge
• Charge Status Output Pin
• C/10 Charge Termination
• 25μA Supply Current in Shutdown
• 2.9V Trickle Charge Threshold
• Soft-Start Limits Inrush Current
• Available in SOT-23-5 Package
Application
• Cellular Telephones,PDAs,MP3 Players
• Charging Docks and Cradles
• Bluetooth Applications
VER 1.2 1
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ACE4054
Technology
Fully integrated constant current/constant voltage
in Constant
Temperature Mode
Li-ion battery charger
Power FET “ON”
Resistance (Between
VCC and BAT)
RON
0.25 Ω
Soft-Start Time
Tss IBAT=0 to IBAT=100V/RPROG
100
μs
Recharge Comparator
Filter Time
tRECHARGE
VBAT High to Low
0.5 5 20 Ms
Termination
Comparator Filter
Time
tTERM
IBAT Falling Below ICHG/10 400 1000 2500 μs
PROG Pin Pull-Up
Current
IPROG
3 μA
Note :
1. Supply current includes PROG pin current (approximately 100μA) but does not include any current delivered to the battery
through the BAT pin (approximately 100mA)
2. ITREM is expressed as a fraction of measured full charge current with indicated PROG resistor
Application Circuit
Supply
Voltage
CHRG
BAT
VCC
PROG
ACE4054
GND
4.2V Li-Ion
Battery
On/Off
VER 1.2 5
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ACE4054
Technology
Fully integrated constant current/constant voltage
Li-ion battery charger
Average rather than instantaneous charge current is more of a concern. A simple low pass filter can be
used on the PROG pin to measure the average battery current as shown in Figure 2. A 10K resistor has
been added between the PROG pin and the filter capacitor to ensure stability.
ACE4054
Figure 2. Isolating Capacitive Load PROG Pin and Filtering
Power Dissipation
The power dissipated in the IC causes the rise of die temperature. Most of the power dissipation is
caused by the internal power MOSFET, and can be calculated by the following equation:
PD= (VCC – VBAT) · IBAT
Where PD is the power dissipated, VCC is the input supply voltage, VBAT is the battery voltage and
IBAT is the charge current. The approximate ambient temperature at which the thermal feedback begins
to protect the IC is:
TA = 120℃ - PDθJA
TA = 120℃ - (VCC – VBAT) · IBAT · θJA
Example: An ACE4054 operating from a 5V USB supply is programmed to supply 400mA full-scale
current to a discharged Li-Ion battery with a voltage of 3.75V. Assuming ΘJA is 150℃ / W (see Board
Layout Considerations), the ambient temperature at which the ACE4054 will begin to reduce the charge
current is approximately:
TA = 120℃ - (5V – 3.75V) · (400mA) · 150℃ / W
TA = 120℃ -0.5W · 150℃ / W = 120℃ - 75℃
TA = 45℃
The ACE4054 can be used above 45℃ ambient, but the charge current will be reduced from 400mA.
The approximate current at a given ambient temperature can be approximated by:
Using the previous example with an ambient temperature of 60℃, the charge current will be reduced to
approximately:
Moreover, when thermal feedback reduces the charge current, the voltage at the PROG pin is also
reduced proportionally as discussed in the operation section.
VER 1.2 11
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ACE4054.PDF ] | |
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