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LTC3555EUFD-3-TRPBF Datasheet(PDF) 5 Page - Linear Technology |
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LTC3555EUFD-3-TRPBF Datasheet(HTML) 5 Page - Linear Technology |
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5 / 32 page  LTC3555/LTC3555-X 5 3555fd SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tSU_STD Stop Condition Time 0.6 μs tHD_DAT(OUT) Data Hold Time 225 ns tHD_DAT(IN) Input Data Hold Time 0 900 ns tSU_DAT Data Setup Time 100 ns tLOW Clock Low Period 1.3 μs tHIGH Clock High Period 0.6 μs tf Clock Data Fall Time 20 300 ns tr Clock Data Rise Time 20 300 ns tSP Spike Suppression Time 50 ns General Purpose 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 1.8 2.25 2.7 MHz IFB1,2,3 FBx Input Current VFB1,2,3 = 0.85V –50 50 nA D1,2,3 Maximum Duty Cycle 100 % RSW1,2,3_PD SWx Pull-Down in Shutdown 10 kΩ General Purpose Switching Regulator 1 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 60 35 35 1 μA μA μA μA μA ILIMSW1 PMOS Switch Current Limit Pulse Skip/Burst Mode Operation 600 800 1100 mA IOUT1 Available Output Current Pulse Skip/Burst Mode Operation (Note 7) Forced Burst Mode Operation (Note 7) LDO Mode (Note 7) 400 60 50 mA mA mA VFB1 VFB1 Servo Voltage (Note 8) l 0.78 0.80 0.82 V 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 9) 2.5 Ω General Purpose Switching Regulator 2 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 60 35 35 1 μA μA μA μA μA ILIMSW2 PMOS Switch Current Limit Pulse Skip/Burst Mode Operation 600 800 1100 mA IOUT2 Available Output Current Pulse Skip/Burst Mode Operation (Note 7) Forced Burst Mode Operation (Note 7) LDO Mode (Note 7) 400 60 50 mA mA mA ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, BAT = 3.8V, DVCC = 3.3V, RPROG = 1k, RCLPROG = 3k, unless otherwise noted. Burst Mode is a registered trademark of Linear Technology Corporation. |
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