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LTC3556EUFD-TRPBF Datasheet(PDF) 5 Page - Linear Technology |
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LTC3556EUFD-TRPBF Datasheet(HTML) 5 Page - Linear Technology |
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5 / 36 page  LTC3556 5 3556f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, VIN1 = VIN2 = VIN3 = VOUT3 = 3.8V, BAT = 3.8V, DVCC = 3.3V, RPROG = 1k, RCLPROG = 3.01k, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tHD_DAT(I) Data Hold Time Input 0 ns tSU_DAT Data Setup Time 100 ns tLOW SCL Clock Low Period 1.3 μs tHIGH SCL Clock High Period 0.6 μs tf Clock/Data Fall Time CB = Capacitance of One BUS Line (pF) 20 + 0.1CB 300 ns tr Clock/Data Rise Time CB = Capacitance of One BUS Line (pF) 20 + 0.1CB 300 ns tSP Input Spike Suppression Pulse Width 50 ns Switching Regulators 1, 2 and 3 VIN1,2,3 Input Supply Voltage 2.7 5.5 V VOUTUVLO VOUT UVLO—VOUT Falling VOUT UVLO—VOUT Rising VIN1,2,3 Connected to VOUT Through Low Impedance. Switching Regulators are Disabled in UVLO 2.5 2.6 2.8 2.9 V V fOSC Oscillator Frequency l 1.8 2.25 2.7 MHz Switching Regulator 1 (Buck) IVIN1 Pulse Skip Mode Input Current Burst Mode ® Input Current Forced Burst Mode Input Current LDO Mode Input Current Shutdown Input Current IOUT1 = 0μA (Note 6) IOUT1 = 0μA (Note 6) IOUT1 = 0μA (Note 6) IOUT1 = 0μA (Note 6) IOUT1 = 0μA, FB1 = 0V 225 35 20 20 400 60 35 35 1 μA μA μA μA μA ILIM1 PMOS Switch Current Limit Pulse Skip/Burst Mode Operation 600 800 1100 mA IOUT1 Available Output Current Pulse Skip/Burst Mode Operation (Note 9) Forced Burst Mode Operation (Note 9) LDO Mode (Note 9) 400 60 50 mA mA mA VFBHIGH1 Maximum Servo Voltage Full Scale (1, 1, 1, 1) (Note 7) l 0.780 0.800 0.820 V VFBLOW1 Minimum Servo Voltage Zero Scale (0, 0, 0, 0) (Note 7) l 0.405 0.425 0.445 V VLSB1 VFB1 Servo Voltage Step Size 25 mV RP1 PMOS RDS(ON) 0.6 Ω RN1 NMOS RDS(ON) 0.7 Ω RLDO_CL1 LDO Mode Closed-Loop ROUT 0.25 Ω RLDO_OL1 LDO Mode Open-Loop ROUT (Note 8) 2.5 Ω IFB1 FB1 Input Current VFB1 = 0.85V –50 50 nA D1 Maximum Duty Cycle l 100 % RSW1 SW1 Pull-Down in Shutdown 10 kΩ Switching Regulator 2 (Buck) IVIN2 Pulse Skip Mode Input Current Burst Mode Input Current Forced Burst Mode Input Current LDO Mode Input Current Shutdown Input Current IOUT2 = 0μA (Note 6) IOUT2 = 0μA (Note 6) IOUT2 = 0μA (Note 6) IOUT2 = 0μA (Note 6) IOUT2 = 0μA, FB2 = 0V 225 35 20 20 400 60 35 35 1 μA μA μA μA μA ILIM2 PMOS Switch Current Limit Pulse Skip/Burst Mode Operation 600 800 1100 mA IOUT2 Available Output Current Pulse Skip/Burst Mode Operation (Note 9) Forced Burst Mode Operation (Note 9) LDO Mode (Note 9) 400 60 50 mA mA mA Burst Mode is a registered trademark of Linear Technology Corporation. |
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