Datasheet LTC1778, LTC1778-1 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Wide Operating Range, No RSENSE Step-Down Controller |
| Pages / Page | 24 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Current Sense Threshold vs I. … |
| Revision | B |
| File Format / Size | PDF / 273 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Current Sense Threshold vs I. On-Time vs I. TH Voltage. ON Current. On-Time vs VON Voltage
Model Line for this Datasheet
Text Version of Document
LTC1778/LTC1778-1
W U TYPICAL PERFOR A CE CHARACTERISTICS Current Sense Threshold vs I On-Time vs I TH Voltage ON Current On-Time vs VON Voltage
10k 300 1000 2V V V VON = 0V I RNG = ION = 30µA 200 1.4V 800 1V 1k 100 0.7V 600 0.5V 0 ON-TIME (ns) ON-TIME (ns) 400 100 200 –100 CURRENT SENSE THRESHOLD (mV) –200 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 0 1 2 3 I ION CURRENT (µA) TH VOLTAGE (V) VON VOLTAGE (V) 1778 G20 1778 G08 1778 G21
Maximum Current Sense On-Time vs Temperature Current Limit Foldback Threshold vs VRNG Voltage
300 150 300 I VRNG = 1V ION = 30µA VVON = 0V 125 250 250 200 100 200 75 150 150 ON-TIME (ns) 100 50 100 50 25 50 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –50 –25 0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 0.5 0.75 1.0 1.25 1.5 1.75 2.0 V TEMPERATURE (°C) FB (V) VRNG VOLTAGE (V) 1778 G09 1778 G22 1778 G10
Maximum Current Sense Maximum Current Sense Feedback Reference Voltage Threshold vs RUN/SS Voltage Threshold vs Temperature vs Temperature
150 150 0.82 VRNG = 1V VRNG = 1V 125 140 0.81 100 130 75 0.80 120 50 0.79 110 25 FEEDBACK REFERENCE VOLTAGE (V) MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 100 0.78 1.5 2 2.5 3 3.5 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 RUN/SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1778 G23 1778 G11 1778 G12 1778fb 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Current Sense Threshold vs I On-Time vs I TH Voltage ON Current On-Time vs VON Voltage
10k 300 1000 2V V V VON = 0V I RNG = ION = 30µA 200 1.4V 800 1V 1k 100 0.7V 600 0.5V 0 ON-TIME (ns) ON-TIME (ns) 400 100 200 –100 CURRENT SENSE THRESHOLD (mV) –200 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 1 10 100 0 1 2 3 I ION CURRENT (µA) TH VOLTAGE (V) VON VOLTAGE (V) 1778 G20 1778 G08 1778 G21
Maximum Current Sense On-Time vs Temperature Current Limit Foldback Threshold vs VRNG Voltage
300 150 300 I VRNG = 1V ION = 30µA VVON = 0V 125 250 250 200 100 200 75 150 150 ON-TIME (ns) 100 50 100 50 25 50 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 –50 –25 0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 0.5 0.75 1.0 1.25 1.5 1.75 2.0 V TEMPERATURE (°C) FB (V) VRNG VOLTAGE (V) 1778 G09 1778 G22 1778 G10
Maximum Current Sense Maximum Current Sense Feedback Reference Voltage Threshold vs RUN/SS Voltage Threshold vs Temperature vs Temperature
150 150 0.82 VRNG = 1V VRNG = 1V 125 140 0.81 100 130 75 0.80 120 50 0.79 110 25 FEEDBACK REFERENCE VOLTAGE (V) MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 100 0.78 1.5 2 2.5 3 3.5 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 RUN/SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1778 G23 1778 G11 1778 G12 1778fb 5
