LTC4007_1 Datasheet, PDF (21/24 Pages) Linear Technology – 4A, High Efficiency, Standalone Li-Ion Battery Charger

APPLICATIO S I FOR ATIO
LTC4007
DCIN
0V TO 20V
3A
V_LOGIC
LOBAT
I_CL
ACP
SHDN
FAULT
CHG
FLAG
R10
100k
THERMISTOR
R11
100k
*
R12
100k ^*
3C4C
CHEM
LOBAT
DCIN
INFET
CLP
I_CL LTC4007 CLN
ACP
TGATE
SHDN
BGATE
FAULT
PGND
CHG
CSP
FLAG
R9 32.4k 1%
NTC
BAT
PROG
R_T
ITH
C7
0.47µF
GND
R_T
309k
1%
TIMING RESISTOR
(~2 HOURS)
Q3
INPUT SWITCH
C1
0.1µF
C4
15nF
R1
4.99k
1%
R_CL
0.033Ω
1%
C2
20µF
L1
Q1
15µH 3A
R_SENSE
0.033Ω
1%
R4
3.01k
1%
Q2
D1
R5 3.01k 1%
R7
6.04k
1%
C6
0.12µF
C5
0.0047µF
R14
52.3k
1%
R6
26.7k
1%
Q4
*PIN OPEN
D1: MBRM140T3
Q1: Si4431ADY
Q2: FDC645N
Q4: 2N7002 OR BSS138
4007 F11
Figure 11. Circuit Application (16.8V/3A) to Automatically Trickle Charge Depleted Batteries
SYSTEM
LOAD
BAT
C3
20µF
MONITOR
(CHARGING
CURRENT
MONITOR)
4007fa
21