LTC4425 Linear Technology, LTC4425 Datasheet - Page 8

• Manufacturer Part Number: LTC4425
• Description: Linear SuperCap Charger
• Manufacturer: Linear Technology

LTC4425
BLOCK DIAGRAM
8
R
R
PF1
PF2
V
IN
PFI_RET
PFO
PFI
V
EN
OUT
+ 250mV
10X
PROFILE GENERATOR
250mV
CHARGE CURRENT
1.2V
V
V
COMPARATOR
IN
IN
COMPARATOR
150mV
– V
REFERENCE
BANDGAP
+
–
+
–
1X
PFC
OUT
PFI
V
IN
– V
OUT
1.2V
1.11V
0.1V
V
IN
OSCILLATOR
– 15mV
200ms
TIMER
V
OUT
CONTROLLER
IDEAL DIODE
+
–
Figure 1. LTC4425 Block Diagram
COMPARATOR
MPSNS
CONSTANT-TEMPERATURE
PGOOD
CONSTANT-CURRENT/
CHARGER CIRCUITRY
CONSTANT-VOLTAGE/
+
–
1
1.11V
V
IN
GND
MPSW
1000
VOLTAGE CLAMP
2.7V 2.45V
CIRCUITRY
PSHUNT
NSHUNT
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R
R
V
LEAKAGE
BALANCER
OUT/2
LBA
PROG
V
V
V
OUT
MID
4425 BD
SEL
FB
R
R
R
PROG
C
C
FB1
FB2
4425p
BIG
BIG