LTC4425EDD#PBF Linear Technology, LTC4425EDD#PBF Datasheet - Page 8

• Manufacturer Part Number: LTC4425EDD#PBF
• Description: IC SUPERCAP CHARGER 12-DFN
• Manufacturer: Linear Technology

Specifications of LTC4425EDD#PBF

• Applications: Supercapacitor Charger
• Current - Supply: 20µA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 12-DFN
• Battery Type: Li-Ion/Li-Pol
• Output Current: 3A
• Output Voltage: 5.5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 125C
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC4425
BLOCK DIAGRAM
8
R
R
PF1
PF2
V
V
IN
IO
PFI_RET
PFO
PFI
V
EN
OUT
+ 250mV
10X
PROFILE GENERATOR
250mV
CHARGE CURRENT
1.2V
V
V
COMPARATOR
IN
IN
COMPARATOR
750mV
– V
REFERENCE
BANDGAP
+
–
+
–
1X
PFC
OUT
PFI
V
IN
– V
OUT
CHARGER
ENABLE
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
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
BIG
BIG
4425f