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LTC4425IMSETRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC4425IMSETRPBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  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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