Datasheet

LTC4425
8
4425fa
For more information www.linear.com/LTC4425
block DiagraM
PSHUNT
NSHUNT
+
V
OUT
V
IN
V
OUT/2
V
MID
V
SEL
PROG
R
PROG
C
BIG
C
BIG
FB
R
LBA
R
LEAKAGE
BALANCER
R
FB2
R
FB1
2.7V 2.45V
1.11V
+
V
OUT
V
IN
– 15mV
IDEAL DIODE
CONTROLLER
+
VOLTAGE CLAMP
CIRCUITRY
CONSTANT-VOLTAGE/
CONSTANT-CURRENT/
CONSTANT-TEMPERATURE
CHARGER CIRCUITRY
MPSW
×1000
MPSNS
×1
BANDGAP
REFERENCE
CHARGE CURRENT
PROFILE GENERATOR
CHARGE CURRENT
250mV 750mV
V
IN
– V
OUT
1X
10X
1.2V
1.11V
0.1V
OSCILLATOR
200ms
TIMER
PGOOD
COMPARATOR
PFI
COMPARATOR
CHARGER
ENABLE
+
V
IN
V
IN
V
IO
V
OUT
+ 250mV
R
PF1
R
PF2
PFI
EN
PFO
PFI_RET
+
PFC
GND
V
IN
– V
OUT
COMPARATOR
4425 BD
1.2V
Figure 1. LTC4425 Block Diagram
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