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PDF LN2054 Data sheet ( Hoja de datos )
| Número de pieza | LN2054 | |
| Descripción | Standalone Linear Li-Ion Battery Charger | |
| Fabricantes | Natlinear | |
| Logotipo |  |
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LN2054
Standalone Linear Li-Ion Battery Charger with Thermal Regulation
■ General Description
The LN2054 is a complete constant-current /constant
-voltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count
make the LN2054 ideally suited for portable applications.
Furthermore, the LN2054 is specifically designed to work
within USB power specifications.
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 LN2054 automatically terminates the
charge cycle when the charge current drops to 1/10th the
programmed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is
removed, the LN2054 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The LN2054 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.
■ Features
Programmable Charge Current Up to 500mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Complete Linear Charger in ThinSOT Package for
single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage Operation with
Thermal Regulation to Maximize Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly from
USB Port
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25µA Supply Current in Shutdown
2.9V Trickle Charge Threshold (LN2054)
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 and SOT89 Package
■ Applications
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
■ Package
SOT-23-5L
5
PROG
4
VCC
SOT-89-5L
CHRG GND BAT
12 3
SOT-23-5L
(Top View)
5
PROG
PROG
4
VCC
CHRG GND BAT
1 23
1 23
SOT-89-5L
(Top View)
Rev.1.0 — April. 25, 2011
1
www.natlinear.com
Free Datasheet http://www.nDatasheet.com
1 page  
■ Absolute Maximum Ratings
LN2054
Parameter
Input Supply Voltage
PROG pin Voltage
BAT pin Voltage
CHAG pin Voltage
Power Dissipation
BAT pin Current
PROG pin Current
Operating Ambient Temperature
Storage Temperature
Symbol
Vcc
Vprog
Vbat
Vchrg
PD
Ibat
Iprog
Topa
Tst r
Maximum Rating
VSS-0.3～VSS+10
VSS-0.3～Vcc+0.3
Vss-0.3～7
VSS-0.3～VSS+10
SOT-23-5L
250
SOT-89-5L
500
500
800
-40～+85
-65～+125
Unit
V
mW
mA
uA
°C
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.
These values must therefore not be exceeded under any conditions.
■ Block Diagram
Rev.1.0 — April. 25, 2011
5
www.natlinear.com
Free Datasheet http://www.nDatasheet.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LN2054.PDF ] | |
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