LTC4008_15 Datasheet, PDF (24/24 Pages) Linear Technology – 4A, High Effi ciency, Multi-Chemistry Battery Charger

LTC4008
TYPICAL APPLICATION
NiMH/4A Battery Charger
DCIN
0V TO 20V
V_LOGIC
I_CL
ACP
FAULT
FLAG
THERMISTOR
10k
NTC
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
Q3
INPUT SWITCH
C1
0.1μF
C4
0.1μF
R1 4.99k 1%
R_CL
0.02Ω
1%
C2
20μF
Q1
L1
10μH
Q2
D1
SYSTEM
LOAD
R_SENSE
0.025Ω
1%
R4 3.01k 1%
R5 3.01k 1%
C5
0.0047μF
R6
26.7k
1%
D1: MBRS130T3
Q1: Si4431BDY
Q2: FDC645N
4008 TA02
NiMH
C3
20μF
BATTERY
PACK
CHARGING
CURRENT
MONITOR
RELATED PARTS
PART NUMBER DESCRIPTION
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Sepic Constant- or Programmable-Current/Constant-
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1.5A Switching Charger
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LTC1709 Family 2-Phase, Dual Synchronous Step-Down Controller
with VID
LTC1729
Li-Ion Battery Charger Termination Controller
LT1769
LTC1778
LTC1960
LTC3711
LTC4006
LTC4007
LTC4100
2A Switching Battery Charger
Wide Operating Range, No R_SENSE™ Synchronous
Step-Down Controller
Dual Battery Charger/Selector with SPI Interface
No R_SENSE Synchronous Step-Down Controller
with VID
Small, High Efficiency, Fixed Voltage, Lithium-Ion
Battery Charger with Termination
High Efficiency, Programmable Voltage
Battery Charger with Termination
Smart Battery Charger Controller
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
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
4008fb
LT 0710 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2003