Datasheet

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