ltc4054x-4.2 Linear Technology Corporation, ltc4054x-4.2 Datasheet

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ltc4054x-4.2

Manufacturer Part Number
ltc4054x-4.2
Description
Standalone Linear Li-ion Battery Charger With Thermal Regulation In Thinsot
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking
Diode Required
Complete Linear Charger in ThinSOT
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
25 A Supply Current in Shutdown
2.9V Trickle Charge Threshold (LTC4054)
Available Without Trickle Charge (LTC4054X)
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
1 F
600mA Single Cell Li-Ion Charger
U
4.5V TO 6.5V
LTC4054-4.2
GND
V
V
IN
CC
4
2
PROG
BAT
3
5
1.65k
U
600mA
4.2V
Li-Ion
BATTERY
405442 TA01a
TM
Package for
Thermal Regulation in ThinSOT
DESCRIPTIO
Li-Ion Battery Charger with
The LTC
voltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count
make the LTC4054 ideally suited for portable applications.
Furthermore, the LTC4054 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 LTC4054 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 LTC4054 automatically enters a low current
state, dropping the battery drain current to less than 2 A.
The LTC4054 can be put into shutdown mode, reducing
the supply current to 25 A.
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.
ThinSOT is a trademark of Linear Technology Corporation.
*U.S.Patent No. 6,522,118
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC4054-4.2/LTC4054X-4.2
®
4054 is a complete constant-current/constant-
Complete Charge Cycle (750mAh Battery)
700
600
500
400
300
200
100
0
0
V
R
T
CC
JA
A
PROG
CONSTANT
POWER
0.25
Standalone Linear
= 25 C
CONSTANT
CURRENT
= 130 C/W
= 5V
U
= 1.65k
0.5
0.75
TIME (HOURS)
TERMINATED
1.0
CHARGE
1.25
CONSTANT
VOLTAGE
1.5
1.75
2.0
405442 TAO1b
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
405442xf
1

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