Datasheet LTC3775 (Analog Devices) - 3

LTC3775
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TA = 25°C (Note 2). VIN = 12V, VRUN = 5V, unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN VIN Supply Voltage l 4.5 38 V IVIN Input DC Supply Current VFB = 0.7V (Note 5) 3.5 mA VRUN = 0V 14 μA
RUN/SHDN Pin
VRUN RUN/SHDN Pin Enable Threshold 1.19 1.22 1.25 V VSHDN RUN/SHDN Pin Shutdown Threshold VRUN/SHDN Rising 0.74 V VSHDN(HYST) RUN/SHDN Pin Shutdown Threshold Hysteresis 140 mV IRUN RUN/SHDN Pin Source Current VRUN/SHDN = 0V –1 μA VRUN/SHDN = 1.5V –5 μA
Error Amplifi er
VFB Feedback Pin Voltage 0.597 0.600 0.603 V l 0.5955 0.6045 V ΔVFB Feedback Voltage Line Regulation 4.5V < VIN < 38V ±0.01 %/V ΔVOUT Output Voltage Load Regulation 1V < VCOMP < 2V (Note 6) 0.01 0.1 % IFB FB Pin Input Current VFB = 0.6V –50 50 nA ICOMP COMP Pin Output Current Sourcing, VCOMP = 0V –0.5 –1 mA Sinking, VCOMP = 2V 1 60 mA f0dB Error Amplifi er Unity-Gain Crossover Frequency (Note 6) 25 MHz
Soft-Start
ISS SS Pin Source Current VSS = 0V –1 μA RSS SS Pin Pull-Down Resistance in Current Limit 1.3 kΩ
Current Limit
ILIMB ILIMB Source Current VILIMB = 1V l –9 –10 –11 μA ILIMT ILIMT Sink Current VILIMT = 12V l 90 100 110 μA ISENSE SENSE Pin Input Current 1 μA VILIMT(MAX) Topside Current Limit Threshold (VIN-SENSE) VILIMT = 0.1V l 90 100 110 mV VILIMB(MAX) Bottom Side Current Limit Threshold (PGND-SW) VILIMB = 0.5V l 80 100 120 mV
INTVCC Low Dropout Voltage Regulator
INTVCC LDO Regulator Output Voltage 4.9 5.2 5.5 V ΔVINTVCC(LINE) INTVCC Line Regulation 7.5V < VIN < 38V 0.01 %/V ΔVINTVCC(LOAD) INTVCC Load Regulation ΔIINTVCC = 0mA to 20mA –1 –0.1 % VDROPOUT INTVCC Regulator Dropout Voltage (VIN – VINTVCC) IINTVCC = 20mA 0.35 V VUVLO INTVCC UVLO Voltage INTVCC Rising 3.0 3.6 4.2 V Hysteresis 0.5 V 3775fa 3 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS