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PDF A4055 Data sheet ( Hoja de datos )
| Número de pieza | A4055 | |
| Descripción | 800mA STANDALONE LINEAR LI-ION BATTERY CHARGER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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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-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Parameter
Manual Shutdown Threshold, PROG
rising
Manual Shutdown Threshold, PROG
falling
Automatic Shutdown Threshold, BAT
rising
Automatic Shutdown Threshold, BAT
falling
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
Power FET ON Resistance
Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
PROG Pin Pull-up Current
Symbol
VMSD, RISE
Conditions
Min
1.15V
Typ.
1.21V
Max
1.3V
VMSD, FALL
0.95V
1.0V
1.05V
VASD, RISE
5mV
30mV 50mV
VASD, FALL
ITERM
VRECHRG
ICHRG
VCHRG
TLIM
RON
TSS
TRECHRG
TTERM
IPROG
RPROG=2kΩ
70mV 100mV 140mV
85mV
4V
8μA
-
100mV
4.05V
12μA
0.35V
115mV
4.1V
35μA
0.6V
- 120°C -
-
-
0.75ms
0.4ms
-
600mΩ
50μS
2ms
1ms
3μA
-
-
4.5ms
2.5ms
-
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
TYPICAL CIRCUIT
1. USB/Wall Adapter Power Li-Ion Charger
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY 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
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
- 11 -
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet A4055.PDF ] | |
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