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LTC4007 Datasheet

  • LTC4007

  • 4A, High Efficiency, Standalone Li Battery Charger

  • 20頁

  • LINER

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Final Electrical Specifications
LTC4007
4A, High Efficiency,
Standalone Li Battery Charger
FEATURES
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DESCRIPTION
January 2003
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Complete Charger Controller for 3- or 4-Cell
Lithium-Ion Batteries
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
鹵0.8%
Charging Voltage Accuracy
Built-In Charge Termination for Li-Ion Batteries
AC Adapter Current Limiting Maximizes Charge Rate*
Thermistor Input for Temperature Qualified Charging
Wide Input Voltage Range: 6V to 28V
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
Programmable Charge Current:
鹵5%
Accuracy
Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Low Battery, Input
Current Limiting and Faults
Charging Current Monitor Output
Available in a 24-Pin Narrow SSOP Package
The LTC
廬
4007 is a complete constant-current/constant-
voltage charger controller for 3- or 4-cell lithium-ion
batteries. The PWM controller uses a synchronous, quasi-
constant frequency, constant off-time architecture that
will not generate audible noise even when using ceramic
capacitors. Charging current is programmable to
鹵5%
accuracy using a programming resistor. Charging current
can also be monitored as a voltage across the program-
ming resistor.
The output float voltage is pin programmed for cell count
(3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer,
programmed by an external resistor, sets the total charge
time. Charging is automatically restarted when cell voltage
falls below 3.9V/cell.
LTC4007 includes a thermistor input, which suspends
charging if an unsafe temperature condition is detected. If
the cell voltage is less than 2.5V, a low-battery indicator
asserts and can be used to program a trickle charge cur-
rent to safely charge depleted batteries. The FAULT pin is
also asserted and charging terminates if the low-battery
condition persists for more than 1/4 of the total charge time.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. Patent No. 5,723,970
APPLICATIO S
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Notebook Computers
Portable Instruments
Battery-Backup Systems
Standalone Li-Ion Chargers
TYPICAL APPLICATIO
DCIN
0V TO 28V
12.6V, 4A Li-Ion Battery Charger
INPUT SWITCH
0.1碌F
4.9k
V
LOGIC
100k
LOBAT
I
CL
ACP
SHDN
FAULT
CHG
FLAG
32.4k
100k
100k
3C4C
CHEM
LOBAT
I
CL
ACP
SHDN
FAULT
CHG
FLAG
NTC
THERMISTOR
10k
NTC
R
T
0.47碌F
309k
TIMING RESISTOR
(~2 HOURS)
DCIN
INFET
CLP
20碌F
Q1
Q2
10碌H
0.025鈩?/div>
Li-Ion
BATTERY
15nF
0.025鈩?/div>
SYSTEM
LOAD
LTC4007 CLN
TGATE
BGATE
PGND
CSP
BAT
PROG
ITH
GND
6.04k
0.12碌F
0.0047碌F
26.7k
3.01k
3.01k
Q1: Si4431DY
Q2: FDC6459
4007 TA01
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.
U
U
U
20碌F
CHARGING
CURRENT
MONITOR
4007i
1

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