Datasheet LT1777 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Low Noise Step-Down Switching Regulator |
| Pages / Page | 24 / 4 — TYPICAL PERFOR A CE CHARACTERISTICS. Minimum Input Voltage. Switch On … |
| File Format / Size | PDF / 286 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Minimum Input Voltage. Switch On Voltage. vs Temperature. vs Switch Current
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LT1777
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Input Voltage Switch On Voltage vs Temperature vs Switch Current
7.4 1.50 7.2 1.25 25°C 7.0 – 55°C 1.00 6.8 0.75 6.6 125°C INPUT VOLTAGE (V) 0.50 6.4 SWITCH VOLTAGE (V) 6.2 0.25 6.0 0 –50 –25 0 25 50 75 100 125 0 100 200 300 400 500 600 700 TEMPERATURE (°C) SWITCH CURRENT (mA) 1777 G01 1777 G02
Switch Current Limit SHDN Pin Shutdown Threshold vs Duty Cycle vs Temperature
1000 900 TA = 25°C 800 800 700 600 600 500 400 400 SHDN PIN VOLTAGE (mV) SWITCH CURRENT LIMIT (mA) 200 300 0 200 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) 1777 G03 1777 G04
SHDN Pin Lockout Thresholds SHDN Pin Current vs Voltage vs Temperature
5 1.30 µA) 0 1.28 UPPER THRESHOLD –5 1.26 LOWER THRESHOLD –10 1.24 SHDN PIN VOLTAGE (V) –15 25°C 1.22 SHDN PIN INPUT CURRENT ( 125°C –55°C –20 1.20 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 SHDN PIN VOLTAGE (V) TEMPERATURE (°C) 1777 G05 1777 G06 4
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Input Voltage Switch On Voltage vs Temperature vs Switch Current
7.4 1.50 7.2 1.25 25°C 7.0 – 55°C 1.00 6.8 0.75 6.6 125°C INPUT VOLTAGE (V) 0.50 6.4 SWITCH VOLTAGE (V) 6.2 0.25 6.0 0 –50 –25 0 25 50 75 100 125 0 100 200 300 400 500 600 700 TEMPERATURE (°C) SWITCH CURRENT (mA) 1777 G01 1777 G02
Switch Current Limit SHDN Pin Shutdown Threshold vs Duty Cycle vs Temperature
1000 900 TA = 25°C 800 800 700 600 600 500 400 400 SHDN PIN VOLTAGE (mV) SWITCH CURRENT LIMIT (mA) 200 300 0 200 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) 1777 G03 1777 G04
SHDN Pin Lockout Thresholds SHDN Pin Current vs Voltage vs Temperature
5 1.30 µA) 0 1.28 UPPER THRESHOLD –5 1.26 LOWER THRESHOLD –10 1.24 SHDN PIN VOLTAGE (V) –15 25°C 1.22 SHDN PIN INPUT CURRENT ( 125°C –55°C –20 1.20 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 SHDN PIN VOLTAGE (V) TEMPERATURE (°C) 1777 G05 1777 G06 4
