Datasheet LTC1874 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Dual Constant Frequency Current Mode Step-Down DC/DC Controller |
| 页数 / 页 | 12 / 3 — TYPICAL PERFORMANCE CHARACTERISTICS. Reference Voltage. Normalized … |
| 文件格式/大小 | PDF / 190 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Reference Voltage. Normalized Oscillator Frequency. Undervoltage Lockout Trip
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LTC1874
W U 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) 1874 G01 1874 G02 1874 G03
Maximum (V Shutdown Threshold IN – SENSE –) Voltage vs Duty Cycle vs Temperature
130 600 VIN = 4.2V VIN = 4.2V 560 120 TA = 25°C 520 110 480 100 440 90 400 360 80 TRIP VOLTAGE (mV) /RUN VOLTAGE (mV) 320 70 I TH 280 60 240 50 200 20 30 40 50 60 70 80 90 100 –55 –35 –15 5 25 45 65 85 105 125 DUTY CYCLE (%) TEMPERATURE (°C) 1874 G04 1874 G05 3
W U 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) 1874 G01 1874 G02 1874 G03
Maximum (V Shutdown Threshold IN – SENSE –) Voltage vs Duty Cycle vs Temperature
130 600 VIN = 4.2V VIN = 4.2V 560 120 TA = 25°C 520 110 480 100 440 90 400 360 80 TRIP VOLTAGE (mV) /RUN VOLTAGE (mV) 320 70 I TH 280 60 240 50 200 20 30 40 50 60 70 80 90 100 –55 –35 –15 5 25 45 65 85 105 125 DUTY CYCLE (%) TEMPERATURE (°C) 1874 G04 1874 G05 3