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LTC4008EGN#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC4008
1
4008fb
TYPICAL APPLICATION
DESCRIPTION
4A, High Effi ciency,
Multi-Chemistry Battery Charger
12.3V, 4A Li-Ion Charger
FEATURES
APPLICATIONS
n
General Purpose Charger Controller
n
High Conversion Effi ciency: Up to 96%
n
Output Currents Exceeding 4A
n
±0.8% Voltage Accuracy
n
AC Adapter Current Limiting Maximizes
Charge Rate*
n
Thermistor Input for Temperature Qualifi ed Charging
n
Wide Input Voltage Range: 6V to 28V
n
Wide Output Voltage: 3V 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, Input Current
Limiting and Faults
n
Charging Current Monitor Output
n
Available in a 20-Pin Narrow SSOP Package
n
Notebook Computers
n
Portable Instruments
n
Battery Backup Systems
The LTC
®
4008 is a constant-current/constant-voltage
charger controller. 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 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 fi nal fl oat 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 bat-
tery temperature returns to within safe limits; a FAULT pin
indicates this condition. A FLAG pin indicates when charg-
ing current has decreased below 10% of the programmed
current. An external sense resistor programs AC adapter
current limiting. The I
CL
pin indicates when the charging
current is being reduced by input current limiting so that
the charging algorithm can adapt.
BATMON
V
FB
I
CL
ACP/SHDN
FAUL T
FLAG
NTC
R
T
I
TH
GND
I
CL
ACP
FAUL T
FLAG
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
PROG
LTC4008
32.4k
0.47μF
THERMISTOR
10k
NTC
0.12μF
100k100k
140k*
15k*
6.04k
150k
V
LOGIC
DCIN
0V TO 28V
0.1μF
INPUT SWITCH
0.1μF
Q1
Q2
20μF
10μH
4.99k
3.01k
3.01k
0.025Ω
0.02Ω
20μF
SYSTEM
LOAD
Li-Ion
BATTERY
CHARGING
CURRENT
MONITOR
26.7k
Q1: Si4431BDY
Q2: FDC645N
0.0047μF
4008 TA01
NOTE: * 0.25% TOLERANCE
ALL OTHER RESISTORS ARE 1% TOLERANCE
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and No R
SENSE
are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5723970.
LTC4008
2
4008fb
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
V
FB
, R
T
to GND ............................................... +7V/–0.3V
NTC .............................................................. +10V/–0.3V
ACP/SHDN, FLAG, FAULT, I
CL
..................... +32V/–0.3V
(Note 1)
ABSOLUTE MAXIMUM RATINGS
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
LTC4008 LTC4008-1*
GN PACKAGE
20-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
INFET
BGATE
PGND
TGATE
CLP
CLN
FLAG
BATMON
BAT
CSP
DCIN
I
CL
ACP/SHDN
R
T
FAULT
GND
V
FB
NTC
I
TH
PROG
T
JMAX
= 125°C, θ
JA
= 160°C/W
EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB
GN PACKAGE
20-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
NC
BGATE
PGND
TGATE
CLP
CLN
FLAG
BATMON
BAT
CSP
DCIN
I
CL
SHDN
R
T
FAULT
GND
V
FB
NTC
I
TH
PROG
T
JMAX
= 150°C, θ
JA
= 140°C/W
*The LTC4008EGN-1 does not have the Input FET function
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4008EGN#PBF LTC4008EGN#TRPBF LTC4008EGN 20-Lead Narrow Plastic SSOP –40°C to 125°C
LTC4008EGN-1#PBF LTC4008EGN-1#TRPBF LTC4008EGN-1 20-Lead Narrow Plastic SSOP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
LTC4008
3
4008fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DCIN
= 20V, V
BAT
= 12V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DCIN Operating Range 628V
I
Q
Operating Current Charging Sum of Current from CLP, CLN, DCIN 3 5 mA
V
TOL
Voltage Accuracy (Notes 2, 5)
l
–0.8
–1.0
0.8
1.0
%
%
BATMON Error (Note 5) Measured from BAT to BATMON,
R
LOAD
= 100k
035 80 mV
I
TOL
Charge Current Accuracy (Note 3) V
CSP
– V
BAT
Target = 100mV
l
–4
–5
4
5
%
%
Shutdown
Battery Leakage Current DCIN = 0V (LTC4008 Only)
ACP/SHDN = 0V
l
l
–10
20 35
10
μA
μA
UVLO Undervoltage Lockout Threshold DCIN Rising, V
BAT
= 0V
l
4.2 4.7 5.5 V
Shutdown Threshold at ACP/SHDN
l
1 1.6 2.5 V
Operating Current in Shutdown V
SHDN
= 0V, Sum of Current from CLP,
CLN, DCIN
23 mA
Current Sense Amplifi er, CA1
Input Bias Current Into BAT Pin 11.66 μA
CMSL CA1/I
1
Input Common Mode Low
l
0V
CMSH CA1/I
1
Input Common Mode High V
DCIN
≤ 28V
l
V
CLN
– 0.2 V
V
OS
Input Voltage Offset –3.5 3.5 mV
Current Comparators I
CMP
and I
REV
I
TMAX
Maximum Current Sense Threshold (V
CSP
– V
BAT
)V
ITH
= 2.5V
l
140 165 200 mV
I
TREV
Reverse Current Threshold (V
CSP
– V
BAT
) –30 mV
Current Sense Amplifi er, CA2
Transconductance 1 mmho
Source Current Measured at I
TH
, V
ITH
= 1.4V –40 μA
Sink Current Measured at I
TH
, V
ITH
= 1.4V 40 μA
Current Limit Amplifi er
Transconductance 1.4 mmho
V
CLP
Current Limit Threshold
l
93 100 107 mV
I
CLN
CLN Input Bias Current 100 nA
Voltage Error Amplifi er, EA
Transconductance 1 mmho
V
REF
Reference Voltage Used to Calculate V
FLOAT
1.19 V
I
BEA
Input Bias Current ±4 ±25 nA
Sink Current Measured at I
TH
, V
ITH
= 1.4V 36 μA
OVSD Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
l
102 107 110 %
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LTC4008EGN#TRPBF

Mfr. #:
Buy LTC4008EGN#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 4A, High Efficiency Li-Ion Charger
Lifecycle:
New from this manufacturer.
Delivery:
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