Datasheet LT1611 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Inverting 1.4MHz Switching Regulator in 5-Lead SOT-23 |
| Pages / Page | 12 / 3 — TYPICAL PERFOR A CE CHARACTERISTICS. NFB Pin Bias Current vs. Efficiency, … |
| File Format / Size | PDF / 271 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. NFB Pin Bias Current vs. Efficiency, VOUT = – 5V. Temperature. NFB vs Temperature
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LT1611
W U TYPICAL PERFOR A CE CHARACTERISTICS NFB Pin Bias Current vs Efficiency, VOUT = – 5V V Temperature NFB vs Temperature
85 –1.245 6 80 –1.240 5 VIN = 5V µA) 75 –1.235 4 70 VIN = 3V –1.230 (V) 3 65 NFBV –1.225 EFFICIENCY (%) 2 60 –1.220 NFB PIN BIAS CURRENT ( 55 1 –1.215 50 0 –1.210 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 1611 G01 1611 G02 1611 G03
Switch VCESAT vs Switch Current SHDN Pin Bias Current vs V Switch Current Limit vs Duty Cycle SHDN
700 50 900 TA = 25°C TA = 25°C 600 800 µA) 40 700 500 600 400 30 (mV) 500 400 CESAT 300 V 20 300 200 200 SHDN PIN BIAS CURRENT ( 10 SWITCH CURRENT LIMIT (mA) 100 100 0 0 0 0 100 200 300 400 500 600 700 0 1 2 3 4 5 10 20 30 40 50 60 70 80 SWITCH CURRENT (mA) SHDN PIN VOLTAGE (V) DUTY CYCLE (%) 1611 G04 1611 G05 1611 G06
Oscillator Frequency vs No-Load Operating Quiescent Switch Current Limit vs Temperature Current vs Temperature* Temperature (Duty Cycle = 30%)
2.00 900 6.0 1.75 V 800 IN = 5V 5.5 700 1.50 5.0 V 600 1.25 IN = 1.5V 4.5 500 1.00 4.0 400 0.75 3.5 300 0.50 3.0 200 OPERATING CURRENT (mA) SWITCHING FREQUENCY (MHz) SWITCH CURRENT LIMIT (mA) 0.25 2.5 100 0 0 2.0 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1611 G07 1611 G09 1611 G08 * Includes bias current through R1, R2 and Schottky leakage current at T ≥ 75°C 3
W U TYPICAL PERFOR A CE CHARACTERISTICS NFB Pin Bias Current vs Efficiency, VOUT = – 5V V Temperature NFB vs Temperature
85 –1.245 6 80 –1.240 5 VIN = 5V µA) 75 –1.235 4 70 VIN = 3V –1.230 (V) 3 65 NFBV –1.225 EFFICIENCY (%) 2 60 –1.220 NFB PIN BIAS CURRENT ( 55 1 –1.215 50 0 –1.210 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 LOAD CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) 1611 G01 1611 G02 1611 G03
Switch VCESAT vs Switch Current SHDN Pin Bias Current vs V Switch Current Limit vs Duty Cycle SHDN
700 50 900 TA = 25°C TA = 25°C 600 800 µA) 40 700 500 600 400 30 (mV) 500 400 CESAT 300 V 20 300 200 200 SHDN PIN BIAS CURRENT ( 10 SWITCH CURRENT LIMIT (mA) 100 100 0 0 0 0 100 200 300 400 500 600 700 0 1 2 3 4 5 10 20 30 40 50 60 70 80 SWITCH CURRENT (mA) SHDN PIN VOLTAGE (V) DUTY CYCLE (%) 1611 G04 1611 G05 1611 G06
Oscillator Frequency vs No-Load Operating Quiescent Switch Current Limit vs Temperature Current vs Temperature* Temperature (Duty Cycle = 30%)
2.00 900 6.0 1.75 V 800 IN = 5V 5.5 700 1.50 5.0 V 600 1.25 IN = 1.5V 4.5 500 1.00 4.0 400 0.75 3.5 300 0.50 3.0 200 OPERATING CURRENT (mA) SWITCHING FREQUENCY (MHz) SWITCH CURRENT LIMIT (mA) 0.25 2.5 100 0 0 2.0 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1611 G07 1611 G09 1611 G08 * Includes bias current through R1, R2 and Schottky leakage current at T ≥ 75°C 3
