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LTC3577 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3577 Datasheet(HTML) 5 Page - Linear Technology |
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5 / 38 page ![]() LTC3675 5 3675fa ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VFB3,4(HIGH) Feedback Regulation Voltage Pulse-Skipping Mode Full-Scale (1,1,1,1) l 780 800 820 mV VFB3,4(LOW) Feedback Regulation Voltage Pulse-Skipping Mode Full-Scale (0,0,0,0) l 405 425 445 mV VLSB3,4 FB3, FB4 Regulation Voltage Step Size 25 mV IFB3,4 Feedback Leakage Current VFB3 = VFB4 = 0.85V –50 50 nA DMAX3,4 Maximum Duty Cycle VFB3 = VFB4 = 0V l 100 % RPMOS3,4 PMOS On-Resistance ISW3 = ISW4 = 100mA 500 mΩ RNMOS3,4 NMOS On-Resistance ISW3 = ISW4 = –100mA 510 mΩ ILEAKP3,4 PMOS Leakage Current EN3 = EN4 = 0 –1 1 μA ILEAKN3,4 NMOS Leakage Current EN3 = EN4 = 0 –1 1 μA RSWPD3,4 Output Pull-Down Resistance in Shutdown EN3 = EN4 = 0 (I2C Bit Set) 10 kΩ tSS3,4 Soft-Start Time 500 μs Buck Regulators Combined IFWD1+2 PMOS Current Limit FB2 = VIN (Note 6) 5.6 A IFWD2+3 PMOS Current Limit FB3 = VIN (Note 6) 4 A IFWD3+4 PMOS Current Limit FB4 = VIN (Note 6) 2.4 A 1A Boost Regulator IVIN5 PWM Mode Burst Mode Operation VFB5 = 0.85V (Notes 4, 5) VFB5 = 0.85V (Notes 4, 5) 150 35 300 60 μA μA VOUT5(MAX) Maximum Regulated Output Voltage 5.35 5.55 5.75 V IFWD5 Forward Current Limit (Note 6) 2.5 3.15 3.9 A VFB5(HIGH) Feedback Regulation Voltage PWM Mode Full-Scale (1,1,1,1) l 780 800 820 mV VFB5(LOW) Feedback Regulation Voltage PWM Mode Full-Scale (0,0,0,0) l 405 425 445 mV VLSB5 FB5 Regulation Voltage Step Size 25 mV IFB5 Feedback Leakage Current VFB5 = 0.85V –50 50 nA DCMAX5 Maximum Duty Cycle NMOS Switch 90 % RPMOS5 PMOS On-Resistance 260 mΩ RNMOS5 NMOS On-Resistance 275 mΩ ILEAKP PMOS Switch Leakage Current –2 2 μA ILEAKN NMOS Switch Leakage Current –2 2 μA ROUTPD5 Output Pull-Down Resistance in Shutdown Boost Regulator Off 10 kΩ tSS5 Soft-Start Time 500 μs 1A Buck-Boost Regulator IVIN6 PWM Mode Burst Mode Operation VFB6 = 0.85V (Note 4, 5) VFB6 = 0.85V(Note 4, 5) 220 20 400 40 μA μA VOUT6(LOW) Minimum Regulated Output Voltage 2.65 2.8 V VOUT6(HIGH) Maximum Regulated Output Voltage 5.25 5.65 V IFWD6 Forward Current Limit PWM Mode (Note 6) 2.1 2.65 3.2 A IPEAK6 Peak Current Limit Burst Mode Operation (Note 6) 200 275 350 mA IZERO6 Zero Current Limit Burst Mode Operation –30 0 30 mA VFB6(HIGH) Feedback Regulation Voltage PWM Mode Full-Scale (1,1,1,1) l 780 800 820 mV VFB6(LOW) Feedback Regulation Voltage PWM Mode Full-Scale (0,0,0,0) l 405 425 445 mV VLSB6 FB6 Regulation Voltage Step Size 25 mV |
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