Datasheet LTC3446 (Analog Devices) - 5

LTC3446
Typical perForMance characTerisTics Undervoltage Lockout Threshold Oscillator Frequency vs Temperature Maximum Peak Inductor Current vs Temperature
2.50 2.5 2.50 2.4 2.45 2.45 2.3 2.40 2.2 2.40 UVLO RISING 2.1 2.35 2.35 UVLO FALLING 2.0 2.30 1.9 2.30 (V) 1.8 2.25 2.25 V IN 1.7 2.20 CURRENT (A) 1.6 2.20 1.5 TOR FREQUENCY (MHz) 2.15 2.15 1.4 V VIN = 2.7V 2.10 1.3 IN = 2.7V V OSCILLA 2.10 VIN = 3.6V 1.2 IN = 3.6V 2.05 VIN = 4.2V 2.05 VIN = 4.2V 1.1 VIN = 5.5V VIN = 5.5V 2.00 1.0 2.00 –50 –30 –10 10 30 50 70 90 110 130 –50 –30 –10 10 30 50 70 90 110 130 –50 –30 –10 10 30 50 70 90 110 130 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3446 G04 3446 G05 3446 G06
Peak Inductor Current VLDO Current Limit VLDO Dropout Voltage vs ITH Voltage vs LVIN Voltage vs Load Current
1.6 1800 100 VIN = 3.6V VIN = 3.6V VIN = 2.8V V 1.4 MODESEL = 3.6V 1600 LVOUT = 0V 90 LVOUT = 1.2V –45°C 80 1.2 1400 27°C 70 90°C 1200 1.0 130°C 60 1000 TAGE (mV) 0.8 50 800 PULSED MEASUREMENT, 0.6 40 T 600 J ≈ TA ≈ 27°C 30 0.4 DROPOUT VOL PEAK INDUCTOR CURRENT (A) VLDO CURRENT LIMIT (mA) 400 20 0.2 200 10 0 0 0 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 0.00 1.00 2.00 3.00 4.00 5.00 6.00 0 50 100 150 200 250 300 ITH PIN VOLTAGE (V) LVIN PIN VOLTAGE (V) LOAD CURRENT (mA) 3446 G07 3446 G08 3446 G09
VIN Bias Current vs VLDO Load Current LVIN No-Load Operating Current Enable/MODESEL Thresholds
450 20 1000 VIN = 5V 400 18 BOTH VLDOS ON AND 900 REGULATING 0.8V 350 16 800 300 14 700 12 600 250 VIN = 3.6V 10 500 200 LVIN = 1.5V CURRENT (µA) LVOUT = 1.2V CURRENT (µA) 8 400 IN V IN 150 ONLY ONE VLDO ENABLED LV 6 300 100 –45°C 4 –45°C 200 –45°C 27°C 27°C 27°C 50 90°C 2 90°C ENABLE/MODESEL THRESHOLD (mV) 100 90°C 130°C 130°C 130°C 0 0 0 0 50 100 150 200 250 300 0 1 2 3 4 5 6 2.5 3 3.5 4 4.5 5 5.5 VLDO OUTPUT CURRENT (mA) LVIN PIN VOLTAGE (V) VIN (V) 3446 G10 3446 G11 3446 G12 3446ff 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts