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LTC4052-42 Datasheet(PDF) 1 Page - Linear Integrated Systems

Part # LTC4052-42
Description  Lithium-Ion Battery Pulse Charger with Overcurrent Protection
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC4052-42 Datasheet(HTML) 1 Page - Linear Integrated Systems

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LTC4052-4.2
1
405242i
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
TYPICAL APPLICATIO
Lithium-Ion Battery
Pulse Charger with
Overcurrent Protection
July 2002
Final Electrical Specifications
Single Cell 4.2V, 1A, Standalone Li-Ion Battery Charger
FEATURES
APPLICATIO S
The LTC
®4052 is a complete standalone pulse charger
with integrated MOSFET for 1-cell lithium-ion batteries.
An external sense resistor provides maximum charge
current limiting as a safety precaution against a user
connecting a wall adapter with the incorrect or no current
limit. The internal MOSFET prevents reverse battery
current from flowing if the input voltage is shorted to
ground, eliminating the need for a blocking diode.
As the battery accepts charge and approaches the
programmed float voltage, the internal MOSFET begins
switching off and on with the duty cycle gradually decreas-
ing as the battery approaches a fully charged condition.
A programmable timer ends the charge cycle. The near
end-of-charge C/10 condition is indicated at the CHRG pin
when the average charge current falls to one-tenth of the
wallpack current. Removing the input voltage puts the
LTC4052 into a sleep mode, dropping the battery current
drain to less than 1
µA (maximum).
The LTC4052 is available in a tiny 8-pin thermally
enhanced MSOP package.
s
Standalone Lithium-Ion Battery Charger
s
Personal Information Appliances
s
Cellular Telephones
s
Cradle Chargers
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Complete Standalone Pulse Charger for 1-Cell
Lithium-Ion Batteries
s
Requires No Microcontroller
s
Internal 0.35
Ω NMOS Switch
s
Sense Resistor Limits Maximum Current for Safety
s
Programmable Charge Termination Timer for
Maximum Capacity Charging
s
No Blocking Diode Required
s
1% Float Voltage Accuracy
s
Near End-of-Charge (C/10) Detection Output
s
Low Battery Drain when Input Supply Is Removed
s
Automatic Trickle Charge for Low Battery
s
Automatic Battery Refresh
s
Thermal Shutdown Protection
s
Small 8-Pin Thermally Enhanced MSOP Package
1k
10k
4.7
RSENSE
0.05
1-CELL 4.2V
Li-Ion
BATTERY
1k
CHRG
ACPR
GATE
BAT
TIMER
CTIMER
0.1
µF
GND
VIN
LTC4052
SENSE
1
µF
0.047
µF
0.022
µF
VIN = 4.5V TO 10V
WITH 1A
CURRENT LIMIT
CHARGE STATUS
4052 TA01
AC PRESENT
DESCRIPTIO
TIME (HOURS)
0
0.5
1.0
2.0
1.5
2.5
3.0
4052 • TA01b
4.5
4.0
3.5
3.0
1.0
0.5
0
5
0
CONSTANT
CURRENT
PULSING
CURRENT
CHARGE
CYCLE
ENDS
C/10
LTC4052 Charge Profile


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