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LTC4425 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC4425
Description  Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4425 Datasheet(HTML) 6 Page - Linear Technology

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LTC4425
6
4425p
TYPICAL PERFORMANCE CHARACTERISTICS
Charge Current vs Voltage Across
Top Capacitor (VOUT – VMID)
Charge Current vs Voltage Across
Bottom Capacitor (VMID)
Output Voltage Transient Step
Response Waveform (LDO Mode)
Output Voltage Waveform When
VMID is Shorted to GND
Output Voltage Waveform When
VMID is Shorted to VOUT
PROG Pin Soft-Start Waveform
(Normal Mode)
Logic Inputs (EN and SEL)
Threshold Voltage vs Temperature
Open Drain Outputs
(PFI_RET and PFO)
FET On-Resistance vs Temperature
PROG Pin Short Circuit Charge
Current vs Temperature
TEMPERATURE (°C)
–45
0
0.4
0.5
0.6
0.7
0.8
0.3
0.1
0.2
0.9
–25
55
75
–5
15
35
4425 G10
VIN = 3.8V
TEMPERATURE (°C)
–45
0
8
10
12
14
16
6
2
4
18
–25
55
75
–5
15
35
4425 G11
VIN = 3.8V
VOUT TO VMID (V)
1.6
0
2000
2500
3000
1500
500
1000
3500
1.7
2.1 2.2 2.3 2.4 2.5
1.8 1.9
2
4425 G12
VIN = 3.8V
VOUT = 3.4V
SEL = 0
PROG PIN GROUNDED
RPROG = 1k
VMID (V)
1.6
0
2000
2500
3000
1500
500
1000
3500
1.7
2.1 2.2 2.3 2.4 2.5
1.8 1.9
2
4425 G13
VIN = 3.8V
VOUT = 3.4V
SEL = 0
PROG PIN GROUNDED
TEMPERATURE (°C)
–45
–25
–5
15
35
55
75
2.70
2.90
2.95
2.85
2.80
2.75
3.00
4425 G011a
VIN = 3.8V
VOUT = 3.3V
PROG PIN SHORTED TO GND
100ms/DIV
SUPERCAP VALUE = 0.55F
4425 G15
VIN = 3.8V
RPROG = 1k
VOUT
20mV/DIV
AC-COUPLED
250ms/DIV
SUPERCAP VALUE = 0.55F
4425 G16
VIN = 3.8V
RPROG = 1k
VIN = 3.8V
RPROG = 1k
VOUT
20mV/DIV
AC-COUPLED
500μs/DIV
4425 G14
VOUT
20mV/DIV
(AC-COUPLED)
VIN = 3.8V
RPROG = 500Ω
SUPERCAP VALUE = 0.55F
ILOAD
800mA
100mA
500μs/DIV
4425 G18
VOUT
(1V/DIV)
VIN = 5V
RPROG = 1k
EN



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