LTC4008_15 Datasheet, PDF (20/24 Pages) Linear Technology – 4A, High Effi ciency, Multi-Chemistry Battery Charger

LTC4008
APPLICATIONS INFORMATION
DCIN
0V TO 28V
V_LOGIC
I_CL
FAULT
FLAG
Z1
Q3
2N7002
R13
1.5k
R11 R12
100k 100k
C7
0.47μF
THERMISTOR
10k
NTC
R_T
150k
R9
15k
0.25%
R8
140k
0.25%
C1
0.1μF
BATMON DCIN
V_FB ^LTC4008-1
C4
15nF _R1
4.99k
1%
R_CL
0.02Ω
1%
I_CL
CLP
SHDN
CLN
Q1
FAULT
TGATE
Q2
D1
FLAG
R10 32.4k 1%
BGATE
NTC
PGND
R4 3.01k 1%
R_T
CSP
R5 3.01k 1%
I_TH
BAT
R7
6.04k
GND
PROG
1%
C6
0.12μF
C5
0.0047μF
R6
28.7k
1%
D1: MBRS130T3
D2: SBM540
Q1: Si4431BDY
Q2: FDC645N
Q4: Si7423DN
Z1 VALUE SIZED FOR ABSOLUTE MAXIMUM ADAPTER VOLTAGE
C2
20μF
L1
10μH
SYSTEM
LOAD
D2
R_SENSE
0.025Ω
1%
Q4
R26
C3
150k
20μF
CHARGE
Q5
2N7002
4008 F10
Li-Ion
BATTERY
Figure 10. Typical LTC4008-1 Application (12.3V/4A)
4008fb
20