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LTC3544 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3544 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 16 page  LTC3544 3 3544fa ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IS Input DC Bias Current Active Mode (Four Regulators Enabled) VFB = 0.7V, ILOAD = 0A, 2.25MHz 825 1100 μA Sleep Mode (Four Regulators Enabled) VFB = 0.9V, ILOAD = 0A, 2.25MHz 70 80 μA Shutdown 0.1 2 μA fOSC Oscillator Frequency VIN = 3V VIN = 2.5V to 5.5V ● 1.8 2.25 2.7 MHz MHz VRUN(HIGH) RUNx Input High Voltage ● 1.0 V VRUN(LOW) RUNx Input Low Voltage ● 0.3 V ISWx SWx Leakage VRUN = 0V, VSW = 0V or 5.5V, VIN = 5.5V ±0.1 ±1 μA IRUNx RUN Leakage Current VIN = 5.5V ● ±0.1 ±1 μA IVFBx VFBx Leakage Current 80 nA tSS Soft-Start Period VFB = 7.5% to 92.5% Full Scale 650 875 1200 μs VUVLO Undervoltage Lockout ● 1.9 2.25 V Individual Regulator Characteristics Regulator SW300 – 300mA IPK Peak Switch Current Limit VFB < VFBREG, Duty Cycle < 35% 400 600 800 mA IS300 Input DC Bias Current–Reg SW300 Only Burst Mode Operation (Sleep) VFB = 0.9V, ILOAD = 0A, 2.25MHz 32 μA RPFET RDS(ON) of P-Channel FET (Note 7) ISW = 100mA 0.55 Ω RNFET RDS(ON) of N-Channel FET (Note 7) ISW = –100mA 0.50 Ω Regulator SW200A – 200mA IPK Peak Switch Current Limit VFB < VFBREG, Duty Cycle < 35% 300 400 500 mA IS200 Input DC Bias Current–Reg SW200A Only Burst Mode Operation (Sleep) VFB = 0.9V, ILOAD = 0A, 2.25MHz 32 μA RPFET RDS(ON) of P-Channel FET (Note 7) ISW = 100mA 0.65 Ω RNFET RDS(ON) of N-Channel FET (Note 7) ISW = –100mA 0.60 Ω Regulator SW200B – 200mA IPK Peak Switch Current Limit VFB < VFBREG, Duty Cycle < 35% 300 400 500 mA IS200 Input DC Bias Current–Reg SW200B Only Burst Mode Operation (Sleep) VFB = 0.9V, ILOAD = 0A, 2.25MHz 32 μA RPFET RDS(ON) of P-Channel FET (Note 7) ISW = 100mA 0.65 Ω RNFET RDS(ON) of N-Channel FET (Note 7) ISW = –100mA 0.60 Ω Regulator SW100 – 100mA IPK Peak Switch Current Limit VFB < VFBREG, Duty Cycle < 35% 200 300 400 mA IS100 Input DC Bias Current–Reg SW100B Only Burst Mode Operation (Sleep) VFB = 0.9V, ILOAD = 0A, 2.25MHz 32 μA RPFET RDS(ON) of P-Channel FET (Note 7) ISW = 100mA 0.80 Ω RNFET RDS(ON) of N-Channel FET (Note 7) ISW = –100mA 0.75 Ω Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3544E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. |
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