LTC4040_15 Datasheet, PDF (12/26 Pages) Linear Technology – 2.5A Battery Backup Power Manager

LTC4040
Block Diagram
V_PWR
INPUT
6.2k
16 ^OVSNS
MN1
R_S
MN2
15
IGATE
67
V_IN
CLN
6V
V_SYS
1, 24
SYSTEM
PFO
R_PF1 ²⁰
PFI
–
19
R_PF2
+
1.19V
POWER-FAIL
COMPARATOR
CHRG
8
FAULT
9
+
–
CP1
OVERVOLTAGE PROTECTION
PROG
0.1V
C/8 DETECTOR
0.74V
+–
A1
A_V = 32
232ms
DELAY
A6
0.8V
BUCK/BOOST ^BOOST
CTRL
BUCK CHARGER
BOOST BACKUP
CHARGER
CTRL
PWM
RST
11
RSTFB
10
BSTFB
18
SW
21, 22
5 BSTOFF
V_IN
4 CHGOFF
R3
V_IN
R4
R_BIAS
NTC
17
R_NTC
R5
0.1V
– UNDERTEMP
+
+
– _OVERTEMP
+
– NTC ENABLE
6.4k –A2+
A3
0.8V 0.8V
CHARGER
LOGIC
2.85V
BAT
BAD-BATTERY
DETECTOR
A4 _R1
0.8V
R2
GND
CLPROG
25
3
PROG
2
BAT
23
8
CHARGE
F0
14
VOLTAGE _F1
SELECTOR
13
F2
12
4040 F01
R_FB1
R_FB2
L1
C_BAT
R_PROG
+
Li-Ion/
LiFePO₄
BATTERY
4040fa
12
For more information www.linear.com/LTC4040