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LTC4006 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4006
Description  4A, High Efficiency, Standalone Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4006 Datasheet(HTML) 1 Page - Linear Technology

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LTC4006
sn4006 4006is
4A, High Efficiency,
Standalone Li-Ion Battery Charger
May 2003
s
Complete Charger Controller for 2-, 3- or 4-Cell
Lithium-Ion Batteries
s
High Conversion Efficiency: Up to 96%
s
Output Currents Exceeding 4A
s
±0.8% Accurate Preset Voltages: 8.4V, 12.6V, 16.8V
s
Built-In Charge Termination with Automatic Restart
s
AC Adapter Current Limiting Maximizes Charge Rate*
s
Automatic Conditioning of Deeply Discharged
Batteries
s
Thermistor Input for Temperature Qualified Charging
s
Wide Input Voltage Range: 6V to 28V
s
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
s
Programmable Charge Current:
±5% Accuracy
s
Indicator Outputs for Charging, C/10 Current
Detection and AC Adapter Present
s
Charging Current Monitor Output
s
16-Pin Narrow SSOP Package
s
Notebook Computers
s
Portable Instruments
s
Battery-Backup Systems
s
Standalone Li-Ion Chargers
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
Final Electrical Specifications
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.
4A Li-Ion Battery Charger
The LTC
®4006 is a complete constant-current/constant-
voltage charger controller for 2-, 3- or 4-cell lithium bat-
teries in a small package using few external components.
The PWM controller is a synchronous, quasi-constant fre-
quency, constant off-time architecture that will not gener-
ate audible noise even when using ceramic capacitors.
The LTC4006 is available in 8.4V, 12.6V and 16.8V versions
with
±0.8% accuracy. Charging current is programmable
with a single sense resistor to
±4%typicalaccuracy.Charg-
ing current can be monitored as a representative voltage at
the IMON pin. A timer, programmed by an external resistor,
sets the total charge time or is reset to 25% of total charge
time after C/10 charging current is reached. Charging au-
tomatically resumes when cell voltage falls below 3.9V/cell.
Fully discharged cells are automatically trickle charged at
10% of the programmed current until the cell voltage ex-
ceeds 2.5V/cell. Charging terminates if the low-battery
condition persists for more than 25% of the total charge
time.
LTC4006 includes a thermistor sensor input that sus-
pends charging if an unsafe temperature condition is
detected and automatically resumes charging when bat-
tery temperature returns to within safe limits.
DCIN
CHG
ACP/SHDN
IMON
NTC
RT
ITH
GND
CHG
ACP
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
LTC4006
0.12
µF
THERMISTOR
10k
NTC
309k
TIMING
RESISTOR
(~2 HOURS)
0.0047
µF
0.47
µF
32.4k
CHARGING
CURRENT MONITOR
100k
VLOGIC
DCIN
0V TO 28V
3A
6k
INPUT SWITCH
0.1
µF
15nF
20
µF
10
µH
5k
0.025
0.033
20
µF
BATTERY
4006 TA01
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
*U.S. Patent No. 5,723,970


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