LTC4008 Datasheet, PDF (24/24 Pages) Linear Technology – 4A, High Efficiency, Multi-Chemistry Battery Charger

LTC4008
TYPICAL APPLICATIO
DCIN
0V TO 20V
V_LOGIC
I_CL
ACP
FAULT
FLAG
THERMISTOR
10k
NTC
NiMH/4A Battery Charger
Q3
INPUT SWITCH
R11 R12
100k 100k
R9
C7
13.3k
0.47µF _0.25%
RT
150k
R8
147k
0.25%
R10 32.4k 1%
R7
6.04k
1%
C6
0.12µF
BATMON DCIN
V_FB
INFET
I_CL LTC4008 CLP
ACP/SHDN CLN
FAULT
TGATE
FLAG
BGATE
NTC
PGND
R_T
CSP
I_TH
BAT
GND
PROG
C1
0.1µF
C4
0.1µF
R1 4.99k 1%
R_CL
0.02Ω
1%
C2
20µF
Q1
L1
10µH
Q2
D1
R4 3.01k 1%
R5 3.01k 1%
C5
0.0047µF
R6
26.7k
1%
D1: MBRS130T3
Q1: Si4431BDY
Q2: FDC645N
4008 TA02
SYSTEM
LOAD
R_SENSE
0.025Ω
1%
C3
20µF
NiMH
BATTERY
PACK
CHARGING
CURRENT
MONITOR
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No R_SENSE is a trademark of Linear Technology Corporation.
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
COMMENTS
High Efficiency, Minimum External Components to Fast Charge Lithium,
NIMH and NiCd Batteries
Charger Input Voltage May be Higher, Equal to or Lower Than Battery Voltage,
500kHz Switching Frequency
1- or 2-Cell Li-Ion, 500kHz or 200kHz Switching Frequency, Termination Flag
Minimizes C_IN and C_OUT, Power Good Output, 3.5V ≤ V_IN ≤ 36V
Up to 42A Output, Minimum C_IN and C_OUT, Uses Smallest Components for
Intel and AMD Processors
Trickle Charge Preconditioning, Temperature Charge Qualification, Time or
Charge Current Termination, Automatic Charger and Battery Detection, and
Status Output
Constant-Current/Constant-Voltage Switching Regulator, Input Current
Limiting Maximizes Charge Current
2% to 90% Duty Cycle at 200kHz, Stable with Ceramic C_OUT
Simultaneous Charge or Discharge of Two Batteries, DAC Programmable
Current and Voltage, Input Current Limiting Maximizes Charge Current
3.5V ≤ V_IN ≤ 36V, 0.925V ≤ V_OUT ≤ 2V, for Transmeta, AMD and Intel
Mobile Processors
Complete Charger for 3- or 4-Cell Li-Ion Batteries, AC Adapter Current Limit
and Thermistor Sensor, 16-Pin Narrow SSOP Package
Complete Charger for 3- or 4-Cell Li-Ion Batteries, AC Adapter Current Limit,
Thermistor Sensor and Indicator Outputs
SMBus Rev 1.1 Compliant
4008fa
LT/LT 0805 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2003