Datasheet LTC1772B (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 |
| Pages / Page | 16 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Reference Voltage. Normalized … |
| File Format / Size | PDF / 226 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Reference Voltage. Normalized Oscillator Frequency. Undervoltage Lockout Trip
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LTC1772B
TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage Normalized Oscillator Frequency Undervoltage Lockout Trip vs Temperature vs Temperature Voltage vs Temperature
825 10 2.24 VIN = 4.2V VIN = 4.2V VIN FALLING 820 8 2.20 815 6 2.16 810 4 2.12 805 2 2.08 800 0 2.04 VOLTAGE (mV) 795 –2 2.00 FBV 790 –4 TRIP VOLTAGE (V) 1.96 785 NORMALIZED FREQUENCY (%) –6 1.92 780 –8 1.88 775 –10 1.84 –55 –35 –15 5 25 45 65 85 105 125 –55 –35 –15 5 25 45 65 85 105 125 –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1772 G01 1772 G02 1772 G03
Maximum (VIN – SENSE–) Voltage Shutdown Threshold vs Duty Cycle vs Temperature
120 600 VIN = 4.2V VIN = 4.2V 560 110 TA = 25°C 520 100 480 90 440 80 400 360 70 TRIP VOLTAGE (mV) /RUN VOLTAGE (mV) 320 60 I TH 280 50 240 40 200 20 30 40 50 60 70 80 90 100 –55 –35 –15 5 25 45 65 85 105 125 DUTY CYCLE (%) TEMPERATURE (°C) 1772 G04 1772 G05 1772bfa 4
TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage Normalized Oscillator Frequency Undervoltage Lockout Trip vs Temperature vs Temperature Voltage vs Temperature
825 10 2.24 VIN = 4.2V VIN = 4.2V VIN FALLING 820 8 2.20 815 6 2.16 810 4 2.12 805 2 2.08 800 0 2.04 VOLTAGE (mV) 795 –2 2.00 FBV 790 –4 TRIP VOLTAGE (V) 1.96 785 NORMALIZED FREQUENCY (%) –6 1.92 780 –8 1.88 775 –10 1.84 –55 –35 –15 5 25 45 65 85 105 125 –55 –35 –15 5 25 45 65 85 105 125 –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1772 G01 1772 G02 1772 G03
Maximum (VIN – SENSE–) Voltage Shutdown Threshold vs Duty Cycle vs Temperature
120 600 VIN = 4.2V VIN = 4.2V 560 110 TA = 25°C 520 100 480 90 440 80 400 360 70 TRIP VOLTAGE (mV) /RUN VOLTAGE (mV) 320 60 I TH 280 50 240 40 200 20 30 40 50 60 70 80 90 100 –55 –35 –15 5 25 45 65 85 105 125 DUTY CYCLE (%) TEMPERATURE (°C) 1772 G04 1772 G05 1772bfa 4
