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A4055 PDF даташит

Спецификация A4055 изготовлена ​​​​«AiT Semiconductor» и имеет функцию, называемую «800mA STANDALONE LINEAR LI-ION BATTERY CHARGER».

Детали детали

Номер произв A4055
Описание 800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Производители AiT Semiconductor
логотип AiT Semiconductor логотип 

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A4055 Даташит, Описание, Даташиты
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-









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A4055 Даташит, Описание, Даташиты
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
Pin #
1
2
3
4
5
Symbol
CHRG
GND
BAT
VCC
PROG
Top View
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 present” condition. When the A4055 detects an under-voltage lockout
condition, CHRG is forced high impedance.
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.
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.
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
-2-









No Preview Available !

A4055 Даташит, Описание, Даташиты
AiT Semiconductor Inc.
www.ait-ic.com
A4055
LINEAR LI-ION BATTERY CHARGER
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
ABSOLUTE MAXIMUM RATINGSNOTE1
VCC Input Supply Voltage
-0.3V to +10V
PROG Voltage
-0.3V to +VCC
BAT Voltage
-0.3V to 7V
CHRG
-0.3V to 10V
BAT Short-Circuit Duration
Continuous
BAT Pin Current
800mA
PROG Pin Current
800μA
Maximum Junction Temperature
125°C
Operating Temperature Range NOTE2
-40°C to 85°C
Storage Temperature Range,
-65°C to 125°C
Lead Temperature (Soldering,10s)
300°C
Thermal Resistance NOTE3
θJA, SOT-25
250°C/W
θJC, SOT-25
130°C/W
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 –40°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.
REV1.1
- OCT 2011 RELEASED, NOV 2014 UPDATED -
-3-










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