Datasheet LT1939 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
| Pages / Page | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Power Good Thresholds vs. Power Good … |
| File Format / Size | PDF / 358 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Power Good Thresholds vs. Power Good Sink Currents vs. Temperature
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LT1939
TYPICAL PERFORMANCE CHARACTERISTICS Power Good Thresholds vs Power Good Sink Currents vs Temperature Temperature Frequency vs Temperature
0.75 1000 600 RRT/SYNC = 90.9k 0.74 900 580 PG 0.73 800 560 RISING EDGE 0.72 700 540 0.71 600 520 PG 0.70 500 500 FALLING EDGE 480 VOLTAGE (V) 0.69 400 CURRENT (μA) FREQUENCY (kHz) 0.68 300 460 0.67 200 440 0.66 100 420 0.65 0 400 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1939 G10 1939 G11 1939 G12
Peak Switch Current vs LDRV Short-Circuit Current vs External Sync Duty Cycle Range Temperature Temperature vs External Sync Frequency
3.5 20 100 3.4 19 90 MAXIMUM DUTY CYCLE 3.3 18 80 3.2 17 70 3.1 16 60 3.0 15 50 2.9 14 CURRENT (A) 40 CURRENT (mA) DUTY CYCLE (%) 2.8 13 30 2.7 12 20 MINIMUM DUTY CYCLE 2.6 11 10 2.5 10 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 250 750 1250 1750 2250 TEMPERATURE (°C) TEMPERATURE (°C) SYNCHRONIZATION FREQUENCY (kHz) 1939 G13 1939 G14 19939 G15
Switch Saturation Voltage vs Minimum Switching Times Frequency vs RRT/SYNC Switch Current
300 2500 600 275 2250 500 250 2000 225 1750 400 200 1500 175 1250 300 TIME (ns) 150 MINIMUM ON TIME 1000 –50°C 200 125 FREQUENCY (kHz) 750 100 25°C MINIMUM OFF TIME 500 100 75 250 SWITCH SATURATION VOLTAGE (mV) 150°C 50 0 0 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 120 140 160 180 200 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TEMPERATURE (°C) R SWITCH CURRENT (A) RT/SYNC (kΩ) 1939 G16 1939 G17 1939 G18 1939f 5
TYPICAL PERFORMANCE CHARACTERISTICS Power Good Thresholds vs Power Good Sink Currents vs Temperature Temperature Frequency vs Temperature
0.75 1000 600 RRT/SYNC = 90.9k 0.74 900 580 PG 0.73 800 560 RISING EDGE 0.72 700 540 0.71 600 520 PG 0.70 500 500 FALLING EDGE 480 VOLTAGE (V) 0.69 400 CURRENT (μA) FREQUENCY (kHz) 0.68 300 460 0.67 200 440 0.66 100 420 0.65 0 400 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1939 G10 1939 G11 1939 G12
Peak Switch Current vs LDRV Short-Circuit Current vs External Sync Duty Cycle Range Temperature Temperature vs External Sync Frequency
3.5 20 100 3.4 19 90 MAXIMUM DUTY CYCLE 3.3 18 80 3.2 17 70 3.1 16 60 3.0 15 50 2.9 14 CURRENT (A) 40 CURRENT (mA) DUTY CYCLE (%) 2.8 13 30 2.7 12 20 MINIMUM DUTY CYCLE 2.6 11 10 2.5 10 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 250 750 1250 1750 2250 TEMPERATURE (°C) TEMPERATURE (°C) SYNCHRONIZATION FREQUENCY (kHz) 1939 G13 1939 G14 19939 G15
Switch Saturation Voltage vs Minimum Switching Times Frequency vs RRT/SYNC Switch Current
300 2500 600 275 2250 500 250 2000 225 1750 400 200 1500 175 1250 300 TIME (ns) 150 MINIMUM ON TIME 1000 –50°C 200 125 FREQUENCY (kHz) 750 100 25°C MINIMUM OFF TIME 500 100 75 250 SWITCH SATURATION VOLTAGE (mV) 150°C 50 0 0 –50 –25 0 25 50 75 100 125 150 0 20 40 60 80 100 120 140 160 180 200 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TEMPERATURE (°C) R SWITCH CURRENT (A) RT/SYNC (kΩ) 1939 G16 1939 G17 1939 G18 1939f 5
