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A4055 데이터시트 PDF




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부품번호 A4055 기능
기능 800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
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A4055 데이터시트, 핀배열, 회로
AiT Semiconductor Inc.
www.ait-ic.com
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
DESCRIPTION
The A4055 is a complete constant-current /
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
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.
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
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
FEATURES
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode
Required
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
Over-Voltage Protect
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
ORDERING INFORMATION
Package Type
Part Number
SOT-25
A4055E5R
E5
A4055E5VR
Note
R: Tape & Reel
V: Halogen free package
AiT provides all RoHS products
Suffix V means Halogen free Package
APPLICATION
Cellular and Smart Phones
Charging Docks and Cradles
Blue Tooth Applications
PDAs
MP3/MP4/MP5 Players
TYPICAL APPLICATION
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
600mA Application Circuit
-1-




A4055 pdf, 반도체, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
ELECTRICAL CHARACTERISTICSNOTE4
VCC=5V,TA= 25°C, unless otherwise noted
Parameter
Symbol
Conditions
Min Typ. Max
Charge Mode Supply Current NOTE5
ISPLYCHRG
RPROG=2kΩ
RPROG =10kΩ
- 2000μA
300μA
- 2000μA
Charge Mode Battery Current
IBATCHRG
RPROG =2kΩ
RPROG =10kΩ
465mA
93mA
500mA
100mA
535mA
107mA
PROG Pin Voltage
VPROGCHRG
RPROG =2kΩ
RPROG=10kΩ
0.93V 1V 1.07V
0.93V 1V 1.07V
Standby Mode Supply Current
ISPLYSTBY
- 100μA 500μA
Standby Mode Battery Current
IBATSTBY
0 -2.5μA -6μA
Manual Shutdown Mode Supply Current
ISPLYMSD
- - 90μA
Manual Shutdown Mode Battery Current
IBATMSD
-2μA
0
2μA
PROG Pin Clamp Voltage
VPROGCLMP
2V - 3V
Automatic Shutdown Mode Supply
Current
ISPLYASD
-
25μA
50μA
Automatic Shutdown Mode Battery
Current
IBATASD
-2μA
0
2μA
UVLO Mode Supply Current
ISPLYUVLO
-
25μA
50μA
UVLO Mode Battery Current
IBATUVLO
-2μA
-
2μA
Sleep Mode Battery Current
IBATSLEEP
-1μA
-
1μA
Float Voltage
VFLOAT
4.158V 4.2V 4.242V
Trickle Charge Current
ITRIKL
RPROG=2kΩ
RPROG =10kΩ
20mA
5mA
50mA
10mA
70mA
15mA
Trickle Charge Threshold
VTRIKL
2.8V
2.9V
3V
Trickle Charge Hysteresis
VTRIKL, HYS
60mV 100mV 150mV
UVLO Threshold
VUVLO
3.7V
3.9V
4.1V
UVLO Hysteresis
VUVLO, HYS
150mV 200mV 300mV
Input Over-Voltage Protect Threshold
VOVP
6.8V 7V 7.2V
Input Over-Voltage Protect Hysteresis
VOVP, HYS
- 200mV -
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).
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
-4-

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A4055 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
Figure 7. Regulated Output (Float) Voltage vs.
Charge Current
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
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.
Temperature(Strong Pull-Down State)
Figure 12. CHRG Pin I-V Curve
(Weak Pull-Down State)
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
-7-

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