LTC4425EDD#PBF Linear Technology, LTC4425EDD#PBF Datasheet - Page 6

• 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
TYPICAL PERFORMANCE CHARACTERISTICS
AC-COUPLED
6
20mV/DIV
3500
3000
2500
2000
1500
1000
500
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–45
0
V
1.6
Logic Inputs (EN and SEL)
Threshold Voltage vs Temperature
Charge Current vs Voltage Across
Top Capacitor (V
OUT
V
SEL = 0
IN
1.7
Output Voltage Waveform When
V
V
R
SEL = 0
= 3.8V
–25
IN
V
R
PROG
MID
V
IN
PROG
OUT
= 3.8V
1.8 1.9
= 3.8V
is Shorted to GND
= 1k
–5
TO V
= 1k
TEMPERATURE (°C)
MID
PROG PIN GROUNDED
15
2
R
DIFFERENTIAL (V)
250ms/DIV
SUPERCAP VALUE = 0.55F
V
OUT
PROG
OUT
2.1 2.2 2.3 2.4 2.5
35
(DC) = 2.45V
– V
= 1k
MID
55
)
75 90
4425 G10
4425 G12
4425 G15
AC-COUPLED
3500
3000
2500
2000
1500
1000
500
18
16
14
12
10
20mV/DIV
8
6
4
2
0
–45
0
1.6
Open Drain Outputs
(PFI_RET and PFO)
FET On-Resistance vs Temperature
Charge Current vs Voltage Across
Bottom Capacitor (V
V
SEL = 0
V
IN
OUT
1.7
= 3.8V
–25
Output Voltage Waveform When
V
V
R
SEL = 0
1.8 1.9
IN
PROG
MID
= 3.8V
–5
TEMPERATURE (°C)
is Shorted to V
= 1k
PROG PIN GROUNDED
V
15
2
R
MID
PROG
2.1 2.2 2.3 2.4 2.5
(V)
100ms/DIV
SUPERCAP VALUE = 0.55F
V
35
OUT
MID
= 1k
(DC) = 2.45V
)
55
OUT
75
4425 G11
4425 G13
T
90
A
= 25°C, unless otherwise noted.
4425 G16
(AC-COUPLED)
20mV/DIV
(1V/DIV)
800mA
100mA
I
V
V
LOAD
3.00
2.95
2.90
2.85
2.80
2.75
2.70
OUT
OUT
EN
–45
PROG Pin Short Circuit Charge
Current vs Temperature
Output Voltage Transient Step
Response Waveform (LDO Mode)
PROG Pin Soft-Start Waveform
(Normal Mode)
V
R
SUPERCAP VALUE = 0.55F
V
V
R
IN =
PROG
OUT
IN
PROG
= 5V
–25
3.8V
(DC) = 3.3V
= 500Ω
= 1k
–5
TEMPERATURE (°C)
PROG PIN SHORTED TO GND
500μs/DIV
500μs/DIV
15
35
55
V
OUT
V
IN
= 3.8V
= 3.3V
4425 G011a
75
4425 G14
4425 G18
4425f
90