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Linear Technology Electronic Components Datasheet

LTC4008 Datasheet

Multi-Chemistry Battery Charger

No Preview Available !

LTC4008
4A, High Efficiency,
Multi-Chemistry Battery Charger
FEATURES
General Purpose Charger Controller
High Conversion Efficiency: Up to 96%
Output Currents Exceeding 4A
±0.8% Voltage Accuracy
AC Adapter Current Limiting Maximizes
Charge Rate*
www.DaTthaeSrhmeeist4tUo.rcIonmput for Temperature Qualified Charging
Wide Input Voltage Range: 6V to 28V
Wide Output Voltage: 3V to 28V
0.5V Dropout Voltage; Maximum Duty Cycle: 98%
Programmable Charge Current: ±4% Accuracy
Indicator Outputs for Charging, C/10 Current
Detection, AC Adapter Present, Input Current
Limiting and Faults
Charging Current Monitor Output
Available in a 20-Pin Narrow SSOP Package
U
APPLICATIO S
Notebook Computers
Portable Instruments
Battery Backup Systems
DESCRIPTIO
The LTC®4008 is a constant-current/constant-voltage
charger controller. The PWM controller uses a synchro-
nous, quasi-constant frequency, constant off-time archi-
tecture that will not generate audible noise even when
using ceramic capacitors. Charging current is program-
mable with a sense resistor and programming resistor to
±4% typical accuracy. Charging current can be monitored
as a voltage across the programming resistor. An external
resistor divider and precision internal reference set the
final float voltage.
The LTC4008 includes a thermistor sensor input that will
suspend charging if an unsafe temperature condition is
detected and will automatically resume charging when
battery temperature returns to within safe limits; a FAULT
pin indicates this condition. A FLAG pin indicates when
charging current has decreased below 10% of the pro-
grammed current. An external sense resistor programs
AC adapter current limiting. The ICL pin indicates when the
charging current is being reduced by input current limiting
so that the charging algorithm can adapt.
, LTC and LT 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
12.3V, 4A Li-Ion Charger
DCIN
0V TO 28V
VLOGIC
ICL
ACP
FAULT
FLAG
100k 100k
THERMISTOR
10k
NTC
150k
0.47µF
140k*
32.4k
15k*
6.04k
0.12µF
LTC4008
BATMON DCIN
VFB
ICL
ACP/SHDN
INFET
CLP
CLN
FAULT
TGATE
FLAG
BGATE
NTC PGND
RT CSP
ITH BAT
GND PROG
INPUT SWITCH
0.1µF
0.1µF
4.99k
0.02
20µF
Q1 10µH
Q2
3.01k
3.01k
0.0047µF 26.7k
Q1: Si4431BDY
Q2: FDC645N
NOTE: * 0.25% TOLERANCE
ALL OTHER RESISTORS ARE 1% TOLERANCE
4008 TA01
0.025
SYSTEM
LOAD
20µF
Li-Ion
BATTERY
CHARGING
CURRENT
MONITOR
4008fa
1


Linear Technology Electronic Components Datasheet

LTC4008 Datasheet

Multi-Chemistry Battery Charger

No Preview Available !

LTC4008
ABSOLUTE MAXIMUM RATINGS (Note 1)
Voltage from DCIN, CLP, CLN to GND ....... +32V/–0.3 V
PGND with Respect to GND .................................. ±0.3V
CSP, BAT to GND ........................................ +28V/–0.3V
VFB, RT to GND ............................................. +7V/–0.3V
NTC ............................................................. +10V/–0.3V
ACP/SHDN, FLAG, FAULT, 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
PACKAGE/ORDER INFORMATION
www.DataSheet4U.coTmOP VIEW
DCIN 1
ICL 2
ACP/SHDN 3
RT 4
FAULT 5
GND 6
VFB 7
NTC 8
ITH 9
PROG 10
20 INFET
19 BGATE
18 PGND
17 TGATE
16 CLP
15 CLN
14 FLAG
13 BATMON
12 BAT
11 CSP
ORDER PART
NUMBER
LTC4008EGN
DCIN 1
ICL 2
SHDN 3
RT 4
FAULT 5
GND 6
VFB 7
NTC 8
ITH 9
PROG 10
TOP VIEW
20 NC
19 BGATE
18 PGND
17 TGATE
16 CLP
15 CLN
14 FLAG
13 BATMON
12 BAT
11 CSP
GN PACKAGE
20-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W
GN PACKAGE
20-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W
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.
ORDER PART
NUMBER
LTC4008EGN-1
THE LTC4008EGN-1
Does Not Have the
Input FET Function
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
DCIN Operating Range
6 28
IQ Operating Current
VTOL Voltage Accuracy
Charging Sum of Current from CLP, CLN, DCIN
(Notes 2, 5)
–0.8
–1.0
3
5
0.8
1.0
BATMON Error (Note 5)
ITOL Charge Current Accuracy (Note 3)
Measured from BAT to BATMON,
RLOAD = 100k
VCSP – VBAT Target = 100mV
0 35 80
–4
–5
4
5
Shutdown
Battery Leakage Current
DCIN = 0V (LTC4008 Only)
ACP/SHDN = 0V
–10
20
35
10
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold at ACP/SHDN
DCIN Rising, VBAT = 0V
4.2 4.7 5.5
1
1.6 2.5
Operating Current in Shutdown
VSHDN = 0V, Sum of Current from CLP,
CLN, DCIN
23
2
UNITS
V
mA
%
%
mV
%
%
µA
µA
V
V
mA
4008fa


Part Number LTC4008
Description Multi-Chemistry Battery Charger
Maker Linear Technology
Total Page 24 Pages
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