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Linear Technology Electronic Components Datasheet

LTC4006 Datasheet

Standalone Li-Ion Battery Charger

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LTC4006
4A, High Efficiency,
Standalone Li-Ion
Battery Charger
FEATURES
DESCRIPTIO
Complete Charger Controller for 2-, 3- or 4-Cell
Lithium-Ion Batteries
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
±0.8% Accurate Preset Voltages: 8.4V, 12.6V, 16.8V
Built-In Charge Termination with Automatic Restart
AC Adapter Current Limiting Maximizes Charge Rate*
Automatic Conditioning of Deeply Discharged
Batteries
Thermistor Input for Temperature Qualified Charging
Wide Input Voltage Range: 6V to 28V
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
Programmable Charge Current: ±4% Accuracy
Indicator Outputs for Charging, C/10 Current
Detection and AC Adapter Present
Charging Current Monitor Output
16-Pin Narrow SSOP Package
U
APPLICATIO S
Notebook Computers
Portable Instruments
Battery-Backup Systems
Standalone Li-Ion Chargers
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% voltage accuracy. Charging current is program-
mable with a single sense resistor to ±4% typical accuracy.
Charging 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. Charg-
ing automatically resumes when the 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.
The LTC4006 includes a thermistor sensor input that
suspends charging if an unsafe temperature condition is
detected and automatically resumes charging when the
battery temperature returns to within safe limits.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5723970.
TYPICAL APPLICATIO
4A Li-Ion Battery Charger
DCIN
0V TO 28V
3A
VLOGIC
CHG
ACP
CHARGING
CURRENT MONITOR
0.1µF
100k
32.4k
THERMISTOR
10k
NTC
0.0047µF
0.47µF
309k
TIMING
RESISTOR
(~2 HOURS)
0.12µF
6k
INPUT SWITCH
DCIN
INFET
LTC4006
CHG CLP
ACP/SHDN CLN
IMON
NTC
TGATE
BGATE
RT PGND
ITH CSP
GND BAT
5k
15nF
0.033
20µF
10µH
TO SYSTEM LOAD
0.025
BATTERY
20µF
4006 TA01
4006fa
1


Linear Technology Electronic Components Datasheet

LTC4006 Datasheet

Standalone Li-Ion Battery Charger

No Preview Available !

LTC4006
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Voltage from DCIN, CLP, CLN, TGATE, INFET,
ACP/SHDN, CHG to GND ....................... + 32V to – 0.3V
Voltage from CLP to CLN ..................................... ±0.3V
CSP, BAT to GND ................................... +28V to – 0.3V
RT to GND ................................................. +7V to – 0.3V
NTC ........................................................ +10V to – 0.3V
Operating Ambient Temperature Range
(Note 4) ............................................. – 40°C to 85°C
Operating Junction Temperature ......... – 40°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
DCIN 1
CHG 2
ACP/SHDN 3
RT 4
GND 5
NTC 6
ITH 7
IMON 8
16 INFET
15 BGATE
14 PGND
13 TGATE
12 CLN
11 CLP
10 BAT
9 CSP
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
ORDER PART
NUMBER
LTC4006EGN-2
LTC4006EGN-4
LTC4006EGN-6
GN PART MARKING
40062
40064
40066
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range (Note 4), otherwise specifications are at TA = 25°C. VDCIN = 20V, VBAT = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DCIN Operating Range
6 28 V
IDCIN DCIN Operating Current
Sum of Current from CLP, CLN, DCIN
35
mA
VTOL Voltage Accuracy
(Note 2)
LTC4006-6
LTC4006-6
LTC4006-2
LTC4006-2
LTC4006-4
LTC4006-4
8.333 8.4 8.467
8.316 8.4 8.484
12.499 12.6 12.700
12.474 12.6 12.726
16.665 16.8 16.935
16.632 16.8 16.968
V
V
V
V
V
V
ITOL Current Accuracy (Note 3)
VCSP – VBAT Target = 100mV
VBAT = 11.5V (LTC4006-2)
VBAT = 7.6V (LTC4006-6)
VBAT = 12V (LTC4006-4)
VBAT < 6V, VCSP – VBAT Target = 10mV
6V VBAT VLOBAT,
VCSP – VBAT Target = 10mV
–4
–5
– 60
– 40
4%
5%
60 %
40 %
TTOL Termination Timer Accuracy
Shutdown
RRT = 270k
–15
15 %
Battery Leakage Current
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold at ACP/SHDN
DCIN = 0V
DCIN = 0V
DCIN = 20V, VSHDN = 0V, VBAT = 12V
DCIN Rising, VBAT = 0V
–10
20
25
0
35
45
10
4.2 4.7 5.5
1
2.5
µA
µA
µA
V
V
DCIN Current in Shutdown
VSHDN = 0V, Sum of Current from CLP,
CLN, DCIN
23
mA
Current Sense Amplifier, CA1
Input Bias Current Into BAT Pin
11.67
µA
CMSL
CMSH
CA1/I1 Input Common Mode Low
CA1/I1 Input Common Mode High
0
VCLN – 0.2
V
V
4006fa
2


Part Number LTC4006
Description Standalone Li-Ion Battery Charger
Maker Linear Technology
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LTC4006 Datasheet PDF






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