A4055E5R [AITSEMI]
STANDALONE LINEAR LI-ION BATTERY CHARGER;
| 型号： | A4055E5R |
| 厂家： | 
AiT Semiconductor |
| 描述： | STANDALONE LINEAR LI-ION BATTERY CHARGER |
| 文件： | 总19页 (文件大小：765K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
DESCRIPTION
FEATURES
The A4055 is
a
complete constant-current
/
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode
Required
constant-voltage linear charger for single cell
lithium-Ion batteries. No external sense resistor is
needed, and no blocking diode is required due to the
internal MOSFET architecture. Thermal feedback
regulates the charge current to limit the die
temperature during high power operation or high
ambient temperature. The charge voltage is fixed at
4.2V, and the charge current can be programmed
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries directly
from USB Port
externally with
a
single resistor. The A4055
automatically terminates the charge cycle when the
charge current drops to 1/10 the programmed value
after the final float voltage is reached.
Over-Voltage Protect
When the input supply (wall adapter or USB supply)
is removed, the A4055 automatically enters a low
current state, dropping the battery drain current to
less than 2μA. The A4055 can be put into shutdown
mode, reducing the supply current to 25μA. Other
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-25 Package
features
include
charge
current
monitor,
under-voltage lockout, automatic recharge and a
status pin to indicate charge termination and the
presence of an input voltage.
The A4055 is available in SOT-25 Package
APPLICATION
Cellular and Smart Phones
Charging Docks and Cradles
Blue Tooth Applications
PDAs
ORDERING INFORMATION
MP3/MP4/MP5 Players
Package Type
SOT-25
Part Number
A4055E5R
A4055E5VR
E5
TYPICAL APPLICATION
SPQ: 3,000pcs/Reel
V: Halogen free package
R: Tape & Reel
Note
AiT provides all RoHS products
600mA Application Circuit
REV1.2
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A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
PIN DESCRIPTION
Top View
Pin #
1
Symbol
CHRG
Function
Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is
pulled low by an internal N-channel MOSFET. When the charge cycle is completed,
a weak pull-down of approximately 12μA is connected to the CHRG pin, indicating
an ꢀAC presentꢁ condition. When the A4055 detects an under-voltage lockout
condition, CHRG is forced high impedance.
2
3
GND
BAT
Ground.
Charge Current Output. Provides charge current to the battery and regulates the
final float voltage to 4.2V. An internal precision resistor divider from this pin sets the
float voltage which is disconnected in shutdown mode.
Positive Input Supply Voltage. Provides power to the charger. VCC can range from
4.25V to 6.5V and should be bypassed with at least a 1μF capacitor. When VCC
drops to within 30mV of the BAT pin voltage, the A4055 enters shutdown mode,
dropping IBAT to less than 2μA.
4
VCC
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge
current is programmed by connecting a 1% resistor, RPROG, to ground. When
charging in constant-current mode, this pin servos to 1V. In all modes, the voltage on
this pin can be used to measure the charge current using the following formula:
IBAT = (VPROG/RPROG) •1000
The PROG pin can also be used to shut down the charger. Disconnecting the
program resistor from ground allows a 3μA current to pull the PROG pin high. When
it reaches the 1.21V shutdown threshold voltage, the charger enters shutdown
mode, charging stops and the input supply current drops to 25μA. This pin is also
clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp
voltage will draw currents as high as 1.5mA. Reconnecting RPROG to ground will
return the charger to normal operation.
5
PROG
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A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
ABSOLUTE MAXIMUM RATINGSNOTE1
VCC Input Supply Voltage
PROG Voltage
-0.3V to +10V
-0.3V to +VCC
-0.3V to 7V
-0.3V to 10V
Continuous
800mA
BAT Voltage
CHRG
BAT Short-Circuit Duration
BAT Pin Current
PROG Pin Current
800μA
Maximum Junction Temperature
Operating Temperature Range NOTE2
Storage Temperature Range,
Lead Temperature (Soldering,10s)
Thermal Resistance NOTE3
θJA, SOT-25
125°C
-40°C to 85°C
-65°C to 125°C
300°C
250°C/W
130°C/W
θJC, SOT-25
Stresses above may cause permanent damage to the device. These are stress ratings only and functional operation of the device at
these or any other conditions beyond those indicated in the Electrical Characteristics are not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
NOTE1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
NOTE2: The A4055 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the ꢂ40°C to 85°C operating
temperature range are assured by design, characterization and correlation with statistical process controls.
NOTE3: Thermal Resistance is specified with approximately 1 square of 1 oz copper.
REV1.2
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A4055
BATTERY MANAGEMENT
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICSNOTE4
VCC=5V, TA= 25°C, unless otherwise noted
Parameter
Symbol
Conditions
Min
-
Typ.
300
Max
2000
2000
535
107
1.07
1.07
500
-6
Unit
RPROG=2kΩ
Charge Mode Supply CurrentNOTE5
ISPLYCHRG
μA
R
R
R
R
R
PROG =10kΩ
PROG =2kΩ
PROG =10kΩ
PROG =2kΩ
PROG=10kΩ
-
465
93
0.93
0.93
-
500
100
1
mA
mA
V
Charge Mode Battery Current
PROG Pin Voltage
IBATCHRG
VPROGCHRG
1
V
Standby Mode Supply Current
Standby Mode Battery Current
Manual Shutdown Mode Supply
Current
ISPLYSTBY
IBATSTBY
100
-2.5
μA
μA
0
ISPLYMSD
-
-
90
μA
Manual Shutdown Mode Battery
Current
IBATMSD
VPROGCLMP
ISPLYASD
-2
2
-
0
-
2
3
μA
V
PROG Pin Clamp Voltage
Automatic Shutdown Mode Supply
Current
25
50
μA
Automatic Shutdown Mode Battery
Current
IBATASD
-2
0
2
μA
UVLO Mode Supply Current
UVLO Mode Battery Current
Sleep Mode Battery Current
Float Voltage
ISPLYUVLO
IBATUVLO
IBATSLEEP
VFLOAT
-
-2
25
-
50
2
μA
μA
μA
V
-1
-
1
4.158
20
4.2
50
10
2.9
100
3.9
200
7
4.242
70
15
3
R
R
PROG=2kΩ
mA
mA
V
Trickle Charge Current
ITRIKL
PROG =10kΩ
5
Trickle Charge Threshold
Trickle Charge Hysteresis
UVLO Threshold
VTRIKL
VTRIKL, HYS
VUVLO
2.8
60
150
4.1
300
7.2
-
mV
V
3.7
150
6.8
-
UVLO Hysteresis
VUVLO, HYS
VOVP
mV
V
Input Over-Voltage Protect Threshold
Input Over-Voltage Protect Hysteresis
VOVP, HYS
200
mV
REV1.2
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A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Parameter
Manual Shutdown Threshold, PROG
rising
Symbol
Conditions
Min
Typ.
1.21
Max
1.3
Unit
V
VMSD, RISE
VMSD, FALL
VASD, RISE
VASD, FALL
1.15
Manual Shutdown Threshold, PROG
falling
0.95
5
1.0
30
1.05
50
V
Automatic Shutdown Threshold, BAT
rising
mV
mV
Automatic Shutdown Threshold, BAT
falling
70
100
140
C/10 Termination Current Threshold
Auto Recharge Battery Voltage
CHRG Pin Weak Pull-down Current
CHRG Pin Output Low Voltage
Junction Temperature In Constant
Temperature Mode
ITERM
VRECHRG
ICHRG
85
4
100
4.05
12
115
4.1
35
mV
V
8
μA
V
VCHRG
-
0.35
0.6
TLIM
-
120
-
°C
Power FET ON Resistance
Soft-Start Time
RON
tSS
-
-
600
50
2
-
-
mΩ
μs
R
PROG=2kΩ
Recharge Comparator Filter Time
Termination Comparator Filter Time
PROG Pin Pull-up Current
tRECHRG
tTERM
IPROG
0.75
0.4
-
4.5
2.5
-
ms
ms
μA
1
3
NOTE4: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
NOTE5: Supply current includes PROG pin current (approximately 100μA) but does not include any current delivered to the battery
through the BAT pin (approximately 100mA).
REV1.2
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A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 1. PROG Pin Voltage vs. Supply Voltage
Figure 2. PROG Pin Voltage vs. Temperature
(Constant Current Mode)
Figure 3. Charge Current vs. PROG Pin Voltage
Figure 4. PROG Pin Pull-Up Current vs.
Temperature and Supply Voltage
Figure 5. PROG Pin Current vs. PROG Pin Voltage
(Pull-Up Current)
Figure 6. PROG Pin Current vs. PROG Pin Voltage
(Clamp Current)
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Figure 7. Regulated Output (Float) Voltage vs.
Charge Current
Figure 8. Regulated Output(Float) Voltage vs.
Temperature
Figure 9. Regulated Output (Float) Voltage vs.
Supply Voltage
Figure 10. CHRG Pin I-V Curve
(Strong Pull-Down State)
Figure 11. CHRG Pin Current vs.
Figure 12. CHRG Pin I-V Curve
(Weak Pull-Down State)
Temperature(Strong Pull-Down State)
REV1.2
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A4055
BATTERY MANAGEMENT
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Figure 13. CHRG Pin Current vs.
Temperature(Weak Pull-Down State)
Figure 14. Trickle Charge Current vs. Temperature
Figure 15. Trickle Charge Current vs.
Figure 16. Trickle Charge Threshold vs.
Temperature
Supply Voltage
Figure 17. Charge Current vs. Battery Voltage
Figure 18. Charge Current vs. Supply Voltage
REV1.2
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A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Figure 19. Charge Current vs. ambient Temperature Figure 20. Recharge Voltage Threshold vs.
Temperature
Figure 21. Power FET "ON" Resistance vs.
Temperature
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A4055
BATTERY MANAGEMENT
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
BLOCK DIAGRAM
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A4055
BATTERY MANAGEMENT
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
TYPICAL CIRCUIT
1. USB/Wall Adapter Power Li-Ion Charger
2. Full Featured Single Cell Li-Ion Charger
3. Using a Microprocessor to Determine CHRG State 4. Basic Li-Ion Charger with Reverse Polarity
Input Protection
5. 800mA Li-Ion Charger with External Power
Dissipation
REV1.2
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A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
DETAILED INFORMATION
The A4055 is a single cell Lithium-Ion battery charger using a constant-current / constant voltage algorithm.
It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage
accuracy of 1%. The A4055 includes an internal P-channel power MOSFET and thermal regulation circuitry.
No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only
two external components. Furthermore, the A4055 is capable of operating from a USB power source.
Normal Charge Cycle
A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold level and a 1%
program resistor is connected from the PROG pin to ground or when a battery is connected to the charger
output. If the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the A4055
supplies approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for
full current charging.
When the BAT pin voltage rises above 2.9V, the charger enters constant-current mode, where the
programmed charge current is supplied to the battery. If the battery voltage is above 2.9V at power-on, A4055
enters the constant-current mode immediately. Refer to Figure 1.
When the BAT pin approaches the final float voltage (4.2V), the A4055 enters constant-voltage mode and the
charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the
charge cycle ends.
Programming Charge Current
The charge current is programmed using a single resistor from the PROG pin to ground. The battery charge
current is 1000 times the current out of the PROG pin. The program resistor and the charge current are
calculated using the following equations:
The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage
using the following equation:
REV1.2
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A4055
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Charge Termination
A charge cycle is terminated when the charge current falls to 1/10 the programmed value after the final float
voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the PROG
pin. When the PROG pin voltage falls below 100mV for longer than TTERM (typically 1ms), charging is
terminated. The charge current is latched off and the A4055 enters standby mode, where the input supply
current drops to 100μA. (Note: C/10 termination is disabled in trickle charging mode).
When charging, transient loads on the BAT pin can cause the PROG pin to fall below 100mV for short periods
of time before the DC charge current has dropped to 1/10 the programmed value. The 1ms filter time (TTERM
)
on the termination comparator ensures that transient loads of this nature do not result in premature charge
cycle termination. Once the average charge current drops below 1/10 the programmed value, the A4055
terminates the charge cycle and ceases to provide any current through the BAT pin. In this state, all loads on
the BAT pin must be supplied by the battery.
Figure1 State Diagram of A4055 Charge Cycle
Charge Status Indicator (CHRG)
The charge status output has three different states: strong pull-down (~10mA), weak pull-down (~12μA) and
high impedance. The strong pull-down state indicates that the A4055 is in a charge cycle. Once the charge
cycle has terminated, the pin state is deter-mined by under-voltage lockout conditions. A weak pull-down
indicates that VCC meets the UVLO conditions and the A4055 is ready to charge. High impedance indicates
that the A4055 is in under-voltage lockout mode: either VCC is less than 100mV above the BAT pin voltage or
insufficient voltage is applied to the VCC pin. A microprocessor can be used to distinguish between these three
statesꢃthe application circuit of this method is shown in the Typical Applications section.
REV1.2
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A4055
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Manual Shutdown
At any point in the charge cycle, the A4055 can be put into shutdown mode by removing RPROG thus floating
the PROG pin. This reduces the battery drain current to less than 2μA and the supply current to less than
50μA. A new charge cycle can be initiated by reconnecting the program resistor.
In manual shutdown, the CHRG pin is in a weak pull-down state as long as VCC is high enough to exceed the
UVLO conditions. The CHRG pin is in a high impedance state if the A4055 is in under-voltage lockout mode:
either VCC is within 100mV of the BAT pin voltage or insufficient voltage is applied to the VCC pin.
Over-Voltage Protect
The A4055 has an internal Over-Voltage Protect comparator, once the input voltage VCC rises above 7V
(VOVP), this comparator will shut down the chip. This feature can pre-vent the A4055 from the over-voltage
stress due to the input transient at hot plug in. In this state, the CHRG pin will be high impedance. Once the
VCC falls back to safe range (VOVP - VOVP, HYS), normal operation continues.
Automatic Recharge
Once the charge cycle is terminated, the A4055 continuously monitors the voltage on the BAT pin using a
comparator with a 2ms filter time (TRECHRG). A charge cycle restarts when the battery voltage falls below 4.05V
(which corresponds to approximately 80% to 90% battery capacity). This ensures that the battery is kept at or
near a fully charged condition and eliminates the need for periodic charge cycle initiations. CHRG output
enters a strong pull-down state during recharge cycles.
Stability Considerations
The constant-voltage mode feedback loop is stable without an output capacitor provided a battery is
connected to the charger output. With no battery present, an output capacitor is recommended to reduce
ripple voltage. When using high value, low ESR ceramic capacitors, it is recommended to add a 1Ω resistor in
series with the capacitor. No series resistor is needed if tantalum capacitors are used.
In constant-current mode, the PROG pin is in the feedback loop, not the battery. The constant-current mode
stability is affected by the impedance at the PROG pin. With no additional capacitance on the PROG pin, the
charger is stable with program resistor values as high as 20k. However, additional capacitance on this node
reduces the maximum allowed program resistor thus it should be avoided.
Average, rather than instantaneous, charge current may be of interest to the user. For example, if a switching
power supply opera-ting in low current mode is connected in parallel with the battery, the average current
being pulled out of the BAT pin is typically of more interest than the instantaneous current pulses. In such a
case, a simple RC filter can be used on the PROG pin to measure the average battery current as shown in
REV1.2
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A4055
BATTERY MANAGEMENT
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Figure 2. A 10k resistor has been added between the PROG pin and the filter capacitor to ensure stability.
Thermal Limiting
An internal thermal feedback loop reduces the programmed charge current if the die temperature attempts to
rise above a preset value of approximately 120°C. This feature protects the A4055 from excessive
temperature and allows the user to push the limits of the power handling capability of a given circuit board
without risk of damaging the A4055. The charge current can be set according to typical (not worst-case)
ambient temperature with the assurance that the charger will automatically reduce the current in worst-case
conditions.
Figure 2. Isolating Capacitive Load on PROG Pin
Power Dissipation
The conditions that cause the A4055 to reduce charge current through thermal feed-back can be
approximated by considering the power dissipated in the IC. Nearly all of this power dissipation is generated
by the internal MOSFETꢃthis is calculated to be approximately:
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:
Example: An A4055 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°C/W, the ambient temperature at which
the A4055 will begin to reduce the charge current is approximately:
REV1.2
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A4055
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
The A4055 can be used above 45°C 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°C, 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. It is important to remember that A4055 applications do
not need to be designed for worst-case thermal conditions since the IC will automatically reduce power
dissipation when the junction temperature reaches approximately 120°C.
Thermal Considerations
The small size of the SOT package, it is very important to use a good thermal PC board layout to maximize
the available charge current. The thermal path for the heat generated by the IC is from the die to the copper
lead frame, through the package leads, (especially the ground lead) to the PC board copper. The PC board
copper is the heat sink. The footprint copper pads should be as wide as possible and expand out to larger
copper areas to spread and dissipate the heat to the surrounding ambient. Feed-through vias to inner or
backside copper layers are also useful in improving the overall thermal performance of the charger. Other
heat sources on the board, not related to the charger, must also be considered when designing a PC board
layout because they will affect overall temperature rise and the maximum charge current.
The following table lists thermal resistance for several different board sizes and copper areas.
All measurements were taken in still air on 3/32" FR-4 board with the device mounted on topside.
Table 1. Measured Thermal Resistance (2-Layer BoardNOTE6
)
COPPER AREA
THERMAL RESISTANCE
JUNCTION-TO-AMBIENT
125℃/W
BOARD ARE
TOPSIDE BACKSIDE
2500mm2
1000mm2
225mm2
100mm2
50mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
125℃/W
130℃/W
135℃/W
150℃/W
NOTE6: Each layer uses one ounce copper
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Table 2. Measured Thermal Resistance (4-Layer BoardNOTE7
)
COPPER AREA
(EACH SIDE)
2500mm2 NOTE8
THERMAL RESISTANCE
BOARD ARE
2500mm2
JUNCTION-TO-AMBIENT
80℃/W
NOTE7: Top and bottom layers use two ounce copper, inner layers use one ounce copper
NOTE8: 10,000mm2 total copper area
VCC Bypass Capacitor
Many types of capacitors can be used for input bypassing, however, caution must be exercised when using
multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of
ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as
connecting the charger input to a live power source. Adding a 1 Ω resistor in series with an X5R ceramic
capacitor will minimize start-up voltage transients.
Charge Current Soft-Start
The A4055 includes a soft-start circuit to minimize the inrush current at the start of a charge cycle. When a
charge cycle is initiated, the charge current ramps from zero to the full-scale current over a period of
approximately 50μs. This has the effect of minimizing the transient current load on the power supply during
start-up.
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
PACKAGE INFORMATION
Dimension in SOT-25 Package (Unit: mm)
Millimeters
Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.080
0.300
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.003
0.012
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
b
C
D
e
H
L
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800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discontinue any integrated circuit product or service without notice, and advises its customers to obtain the
latest version of relevant information to verify, before placing orders, that the information being relied on is
current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to
be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT
products in such applications is understood to be fully at the risk of the customer.
As used herein may
In order to
involve potential risks of death, personal injury, or server property, or environmental damage.
minimize risks associated with the customer's applications, the customer should provide adequate design and
operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT
warrants the performance of its products of the specifications applicable at the time of sale.
REV1.2
- OCT 2011 RELEASED, SEP 2018 UPDATED -
- 19 -
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