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PDF A4054A Data sheet ( Hoja de datos )
| Número de pieza | A4054A | |
| Descripción | 800mA STANDALONE LINEAR Li-ion BATTERY CHARGER | |
| Fabricantes | AiT Semiconductor | |
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AiT Semiconductor Inc.
www.ait-ic.com
A4054A
800mA STANDALONE LINEAR Li-ion BATTERY CHARGER
THERMAL REGULATION
DESCRIPTION
The A4054A 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 A4054A 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 A4054A automatically enters a low
current state, dropping the battery drain current to
less than 2μA. The A4054A 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. A4054A will check the battery voltage
first, it will not start charging unless the battery
voltage is below the auto-rechrage threshold.
The A4054A is available in SOT-25 packages.
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 Packages
APPLICATION
Cellular and Smart Phones
Charging Docks and Cradles
Blue Tooth Applications
PDAs
MP3/MP4/MP5 Players
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
SOT-25
A4054AE5R
E5
A4054AE5VR
Note
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “V” means Halogen free Package
REV1.1
- DEC 2008 RELEASE, JUN 2012 UPDATED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A4054A
800mA STANDALONE LINEAR Li-ion BATTERY CHARGER
THERMAL REGULATION
Parameter
Symbol
Conditions Min. Typ. Max. Unit
Manual Shutdown Threshold, PROG
rising
VMSD, RISE
1.15 1.21 1.3
V
Manual Shutdown Threshold, PROG
falling
VMSD, FALL
0.95 1.0 1.05
V
Automatic Shutdown Threshold, BAT
rising
VASD, RISE
5 30 50 mV
Automatic Shutdown Threshold, BAT
falling
VASD, FALL
70 100 140 mV
C/10 Termination Current Threshold
ITERM
85 100 115 mV
Auto Recharge Battery Voltage
VRECHRG
4 4.05 4.1
V
CHRGb Pin Weak Pull-down Current
ICHRGb
8 12 35 μA
CHRGb Pin Output Low Voltage
VCHRGb
0.35 0.6
V
Junction Temperature In Constant
Temperature Mode
TLIM
120 °C
Power FET ON Resistance
RON
600 mΩ
Soft-Start Time
TSS RPROG =2kΩ
50 μs
Recharge Comparator Filter Time
TRECHRG
0.75 2
4.5 ms
Termination Comparator Filter Time
TTERM
0.4 1 2.5 ms
PROG Pin Pull-up Current
IPROG
3 μA
NOTE2: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
NOTE3: 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
- DEC 2008 RELEASE, JUN 2012 UPDATED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A4054A
800mA STANDALONE LINEAR Li-ion BATTERY CHARGER
THERMAL REGULATION
BLOCK DIAGRAM
REV1.1
- DEC 2008 RELEASE, JUN 2012 UPDATED -
- 11 -
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet A4054A.PDF ] | |
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