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IT4054 Schematic ( PDF Datasheet ) - Infiniture

Teilenummer IT4054
Beschreibung Standalone Linear Li-lon Battery Charger
Hersteller Infiniture
Logo Infiniture Logo 




Gesamt 7 Seiten
IT4054 Datasheet, Funktion
IT4054
Standalone Linear Li-lon Battery Charger With
Thermal Regulation in ThinSOT
Description
Features
IT4054 is a complete constant-current & Constant voltage Programmable Charge Current Up to 800mA.
linear charge for single cellLithium-ion and Lithium-Polymer No MOSFET,Sense Resistor or Blocking Diode
batteries. Its Make IT4054 ideally suited for portable
Required.
Applications. Furthermore. The IT4054 is Specifically Constant-Current/Constant-Voltage Operation with
designed to work within USB Power sprcification. At the
Thermal
same time, IT4054 Can also be used in the standalone
Protection to Maximize Charge Rate without Risk of
lithium - Ion And Lithium-polymer battery charger. No
Overheating.
external sense resistor is needed, and No Blocking diode is Charges Single Cell Li-lon Batteries Directly from USB
required due to the Internal MOSFET architecture. Thermal
Port.
feedback Regulates the charge current to limit the Preset 4.2V Charge Voltage with ±1% Accuracy.
dieTemperature during high power operation or High 25uA Supply Current in Shutdown
ambient temperature. The charge voltage Is fixed at 4.2V, 2.9V Trickle Charge Threshold
and the charge current can be programmed externally with Available Without Trickle Charge
a single resistor .The IT4054 automatically thrminates the Soft-Start Limits Inrush Current
charge cycle when the charge current drops to 1/10th the Available in 5-Lead SOT-23 Package
programmed value after the final float voltage is reached. Application
When the input supply ( wall adapter or USB supply ) is Cellular Telephones. PDA’s,MP3 Players.
removed. The IT4054 automatically enters a low current Charging Docks and Cradles
stage,dropping the battery drain current to less than 2uA Bluetooth Applications
The IT4054 can be put into shutdown mode. Reducing
the supply current to 25 uA. Other features include
charge current monitor, Undervoltage lockout,
automatic recharge and a status Pin to indicate charge
termination and the presence of An input voltage.
Other features include charge current monitor,undervoltage
Lockout,automatic recharge and a status pin to indicate
Charge termination and the presenceof an input voltage
1
Free Datasheet http://www.nDatasheet.co






IT4054 Datasheet, Funktion
IT4054
APPLICATION INFORMATION
USB and Wall Adapter PowerThe IT 4054 allows charging
from both a wall Adapter and a USB port,Figure 7 shows
an example Of how to combine wall adapter and USB
Of how to combine wall adapter and USB power inputs.
A P-channel MOSFET,MP1,is used to prevent back
conducting Into the USB port when a wall adapter is present
and a schottky Diode,D1,is used to prevent USB power loss
through the 1k Pull-down resistor Typically a wall adapter can
supply more current than the 500Ma-Limited USB
port.Thereforean-N-channel MOSFET, MN1,and an extra
10k program resistor are used to Increase the charge current
to 600mA when the wall Adapter is present.
5V WALL
ADAPTER
600mA Ichg
USB POWER
500mA Ichg
MP1
1K
Ichg
D1 BAT 3
IT4054
4 VCC PROG 5
10K
MN1
10K
SYSTEM
LOAD
LI-LON
BATTERY
TYPICAL APPLICATION
USB/Wall Adapter Power Li-lon Charger
5V WALL
ADAPTER
1uF
USB
POWER
IBAT
3
BAT
4 VCC IT4054-4.2
2.5K
1K PROG 5
CHRG GND
10K
470
Full Featured Single Cell Li-lon Charger
LI-LON
CELL
100MA/
500MA
VIN=5V
1uF
VCC
330
IT4054-4.2
3
1 BAT
CHRG
PROG 5
GND
500mA
2K
SHDN
800mA Li-lon Charger with External power Dissipation
VIN=5V
800MA
0.25
4 VCC
BAT 3
1uF IT4054-4.2
GND PROG 5
1.25K
Basic Li-lon Charger with
Reverse Polarity input Protection
5V WELL
ADAPTER
500MA
4 VCC
1uF
BAT 3
IT4054-4.2
GND PROG 5
2K
6
Free Datasheet http://www.nDatasheet.com

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