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Linear Technology Electronic Components Datasheet

LTC4007 Datasheet

Standalone Li-Ion Battery Charger

No Preview Available !

LTC4007
4A, High Efficiency,
Standalone Li-Ion Battery Charger
FEATURES
DESCRIPTION
n Complete Charger Controller for 3- or 4-Cell
Lithium-Ion Batteries
n High Conversion Efficiency: Up to 96%
n Output Currents Exceeding 4A
n ±0.8% Charging Voltage Accuracy
n Built-In Charge Termination for Li-Ion Batteries
n AC Adapter Current Limiting Maximizes Charge Rate*
n Thermistor Input for Temperature Qualified Charging
n Wide Input Voltage Range: 6V to 28V
n 0.5V Dropout Voltage; Maximum Duty Cycle: 98%
n Programmable Charge Current: ±4% Accuracy
n Indicator Outputs for Charging, C/10 Current Detection,
AC Adapter Present, Low Battery, Input Current
Limiting and Faults
n Charging Current Monitor Output
n Available in a 24-Pin Narrow SSOP Package
APPLICATIONS
n Notebook Computers
n Portable Instruments
n Battery-Backup Systems
n Standalone Li-Ion Chargers
The LTC®4007 is a complete constant-current/constant-volt-
age 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 gen-
erate audible noise even when using ceramic capacitors.
Charging current is programmable to ±4% accuracy using
a programming resistor. Charging current can also be mon-
itored as a voltage across the programming 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 charge ter-
mination 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 current
to safely charge depleted batteries. The FAULT pin is also
asserted and charging terminates if the low-battery con-
dition persists for more than 1/4 of the total charge time.
All registered trademarks and trademarks are the property of their respective owners. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5723970.
TYPICAL APPLICATION
12.6V, 4A Li-Ion Battery Charger
DCIN
0V TO 28V
VLOGIC
LOBAT
ICL
ACP
SHDN
FAULT
CHG
FLAG
100k
THERMISTOR
10k
NTC
100k 100k
32.4k
0.47µF
3C4C
DCIN
CHEM
INFET
LOBAT
CLP
ICL LTC4007 CLN
ACP TGATE
SHDN
BGATE
FAULT
PGND
CHG CSP
FLAG
BAT
NTC PROG
RT ITH
GND
309k
TIMING RESISTOR
(~2 HOURS)
INPUT SWITCH
0.1µF
4.99k
15nF 0.025Ω
20µF
Q1
10µH
0.025Ω
Q2
SYSTEM
LOAD
Li-Ion
20µF BATTERY
3.01k
3.01k
6.04k
0.12µF
0.0047µF
26.7k
Q1: Si4431DY
Q2: FDC6459
CHARGING
CURRENT
MONITOR
4007 TA01
Document Feedback
For more information www.analog.com
Rev D
1


Linear Technology Electronic Components Datasheet

LTC4007 Datasheet

Standalone Li-Ion Battery Charger

No Preview Available !

LTC4007
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Voltage from DCIN, CLP, CLN to GND.......... +32V/–0.3V
PGND with Respect to GND................................... ±0.3V
CSP, BAT to GND.......................................... +28V/–0.3V
CHEM, 3C4C, RT to GND................................. +7V/–0.3V
NTC............................................................... +10V/–0.3V
ACP, SHDN, CHG, FLAG,
FAULT, LOBAT, ICL........................................ +32V/–0.3V
CLP to CLN.............................................................±0.5V
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
PIN CONFIGURATION
TOP VIEW
DCIN 1
CHG 2
ACP 3
RT 4
FAULT 5
GND 6
3C4C 7
LOBAT 8
NTC 9
ITH 10
PROG 11
NC 12
24 SHDN
23 INFET
22 BGATE
21 PGND
20 TGATE
19 CLN
18 CLP
17 FLAG
16 CHEM
15 BAT
14 CSP
13 ICL
GN PACKAGE
24-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 88°C/W
ORDER INFORMATION http://www.linear.com/product/LTC4007#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4007EGN#PBF
LTC4007EGN#TRPBF
LTC4007EGN
24-Lead Plastic SSOP
–40°C to 85°C
Consult ADI Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
E LECTRICAL CHARACTERISTICS The l denotes the 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
DCIN Operating Range
6 28
IQ Operating Current
VTOL Charge Voltage Accuracy
Sum of Current from CLP, CLN , DCIN
Nominal Values: 12.3V, 12.6V, 16.4V,
16.8V (Note 2)
–0.8
l –1.0
3
5
0.8
1.0
ITOL Charge Current Accuracy (Note 3)
VCSP – VBAT Target = 100mV
6VVBAT V<B6AVT,≤VVCSLPOBAVT,BVACTSTPa–rgVetBA=T10mV
Target = 10mV
–4
l –5
–60
–35
4
5
60
35
TTOL Termination Timer Accuracy
Shutdown
RRT = 270k
l –15
15
Battery Leakage Current
DCIN = 0V
SHDN = 3V
l
l –10
15
35
10
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold at SHDN
DCIN Rising, VBAT = 0
l 4.2 4.7 5.5
l1
1.6 2.5
SHDN Pin Current
–10
Operating Current in Shutdown
VCSLHND,ND=CI0NV, Sum of Current from CLP,
23
2 For more information www.analog.com
UNITS
V
mA
%
%
%
%
%
%
%
µA
µA
V
V
µA
mA
Rev D


Part Number LTC4007
Description Standalone Li-Ion Battery Charger
Maker Linear Technology
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LTC4007 Datasheet PDF






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