Datasheet LT3753 (Analog Devices) - 4

LT3753
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, UVLO_VSEC = 2.5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
Operational Input Voltage l 8.5 100 V VIN(ON) l 7.75 8.4 V VIN(OFF) 7.42 V VIN(ON/OFF) Hysteresis l 0.11 0.33 0.55 V VIN Quiescent Current FB = 1.5V (Not Switching) 5.9 7.5 mA UVLO_VSEC Micropower Threshold (VSD) IVIN < 20µA l 0.2 0.4 0.6 V VIN Shutdown Current (Micropower) UVLO_VSEC = 0.2V 20 40 µA UVLO_VSEC Threshold (VSYS_UV) l 1.180 1.250 1.320 V VIN Shutdown Current (After Soft-Stop) UVLO_VSEC = 1V 165 220 µA UVLO_VSEC (ON) Current UVLO_VSEC = VSYS_UV + 50mV 0 µA UVLO_VSEC (OFF) Current UVLO_VSEC = VSYS_UV – 50mV Hysteresis Current l 4.0 5 6.0 µA With One-Shot Communication Current (Note 13) 25 µA OVLO (Rising) (No Switching, Reset SS1) l 1.220 1.250 1.280 V OVLO (Falling) (Restart SS1) 1.215 V OVLO Hysteresis l 23 35 47 mV OVLO Pin Current (Note 8) OVLO = 0V 5 100 nA OVLO = 1.5V (SS1 = 2.7V) 0.9 mA OVLO = 1.5V (SS1 = 1.0V) 5 100 nA
Oscillator
Frequency: fOSC = 100kHz RT = 82.5k 94 100 106 kHz Frequency: fOSC = 300kHz RT = 24.9k l 279 300 321 kHz Frequency: fOSC = 500kHz RT = 14k 470 500 530 kHz fOSC Line Regulation RT = 24.9k, 8.5V < VIN < 100V 0.05 0.1 %/V Frequency and DVSEC Foldback Ratio (Fold) SS1 = VSSACT + 25mV, SS2 = 2.7V 4 SYNC Input High Threshold (Note 4) l 1.2 1.8 V SYNC Input Low Threshold (Note 4) l 0.6 1.025 V SYNC Pin Current SYNC = 6V 75 µA SYNC Frequency/Programmed fOSC 1.0 1.25 kHz/kHz
Linear Regulator (INTVCC)
INTVCC Regulation Voltage 9.4 10 10.4 V Dropout (VIN-INTVCC) VIN = 8.75V, IINTVCC = 10mA 0.6 V INTVCC UVLO(+) (Start Switching) 7 7.4 V INTVCC UVLO(–) (Stop Switching) 6.8 7.2 V INTVCC UVLO Hysteresis 0.1 0.2 0.3 V INTVCC OVLO(+) (Stop Switching) 15.9 16.5 17.2 V INTVCC OVLO(–) (Start Switching) 15.4 16 16.7 V INTVCC OVLO Hysteresis 0.38 0.5 0.67 V INTVCC Current Limit INTVCC = 0V 9.5 13 17 mA INTVCC = 8.75V l 19 27 32 mA Rev. B 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Package Description Revision History Typical Application Related Parts