Datasheet LT1070, LT1071 (Linear Technology) - 5
| Manufacturer | Linear Technology |
| Description | 5A and 2.5A High Efficiency Switching Regulators |
| Pages / Page | 12 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Supply Current vs Supply Voltage. … |
| Revision | E |
| File Format / Size | PDF / 218 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Supply Current vs Supply Voltage. Driver Current* vs Switch Current
Model Line for this Datasheet
Text Version of Document
LT1070/LT1071
W U TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage Driver Current* vs Switch Current Supply Current vs Input Voltage* (Shutdown Mode)
160 16 160 TJ = 25°C TJ = 25°C 140 15 140 90% DUTY CYCLE 14 120 120 13 ISWITCH ≤ 10mA µA) 100 100 12 VC = 50mV 80 11 80 TJ = –55°C 50% DUTY CYCLE 60 10 60 TJ ≥ 25°C 9 DRIVER CURRENT (mA) 40 INPUT CURRENT (mA) SUPPLY CURRENT ( 40 10% DUTY CYCLE 8 20 20 VC = 0V 7 0% DUTY CYCLE 0 6 0 0 1 2 3 4 5 0 10 20 30 40 50 60 0 10 20 30 40 50 60 SWITCH CURRENT (A) INPUT VOLTAGE (V) SUPPLY VOLTAGE (V) 1070/71 G10 1070/71 G11 *AVERAGE LT1070 POWER SUPPLY CURRENT IS 1070/71 G12 *UNDER VERY LOW OUTPUT CURRENT FOUND BY MULTIPLYING DRIVER CURRENT BY CONDITIONS, DUTY CYCLE FOR MOST DUTY CYCLE, THEN ADDING QUIESCENT CURRENT CIRCUITS WILL APPROACH 10% OR LESS
Normal/Flyback Mode Threshold on Feedback Pin Shutdown Mode Supply Current Error Amplifier Transconductance
500 –24 200 5000 ∆I 490 –22 g 180 4500 m = (VC PIN) ∆V (FB PIN) FEEDBACK PIN CURRENT ( 480 –20 160 4000 470 –18 µA) 140 µmho) 3500 FEEDBACK PIN VOLTAGE 460 –16 (AT THRESHOLD) 120 3000 TJ = 150°C 450 –14 100 2500 440 –12 80 2000 430 –10 µ 60 1500 SUPPLY CURRENT ( FEEDBACK PIN CURRENT A) – 55°C ≤ TJ ≤ 125°C FEEDBACK PIN VOLTAGE (mV) 420 – 8 (AT THRESHOLD) 40 TRANSCONDUCTANCE ( 1000 410 – 6 20 500 400 – 4 0 0 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 70 80 90 100 –75 – 50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) V TEMPERATURE ( C PIN VOLTAGE (mV) °C) 1070/71 G13 1070/71 G14 1070/71 G14
Idle Supply Current Shutdown Thresholds vs Temperature Feedback Pin Clamp Voltage
400 – 400 11 500 VC = 0.6V 10 450 350 CURRENT –350 (OUT OF VC PIN) 9 400 300 –300 V – 55°C C PIN CURRENT ( 8 350 250 –250 7 VSUPPLY = 60V 300 25°C 200 –200 6 250 VOLTAGE V 150°C SUPPLY = 3V 150 –150 5 200 PIN VOLTAGE (mV) µ C A) V 4 150 100 –100 FEEDBACK VOLTAGE (mV) IDLE SUPPLY CURRENT (mA) V 3 100 C VOLTAGE IS REDUCED UNTIL 50 REGULATOR CURRENT DROPS – 50 2 50 BELOW 300µA 0 0 1 0 – 75 – 50 – 25 0 25 50 75 100 125 150 –75 – 50 –25 0 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 TEMPERATURE (°C) TEMPERATURE (°C) FEEDBACK CURRENT (mA) 1070/71 G16 1070/71 G14 1070/71 G18 10701fe 5
W U TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage Driver Current* vs Switch Current Supply Current vs Input Voltage* (Shutdown Mode)
160 16 160 TJ = 25°C TJ = 25°C 140 15 140 90% DUTY CYCLE 14 120 120 13 ISWITCH ≤ 10mA µA) 100 100 12 VC = 50mV 80 11 80 TJ = –55°C 50% DUTY CYCLE 60 10 60 TJ ≥ 25°C 9 DRIVER CURRENT (mA) 40 INPUT CURRENT (mA) SUPPLY CURRENT ( 40 10% DUTY CYCLE 8 20 20 VC = 0V 7 0% DUTY CYCLE 0 6 0 0 1 2 3 4 5 0 10 20 30 40 50 60 0 10 20 30 40 50 60 SWITCH CURRENT (A) INPUT VOLTAGE (V) SUPPLY VOLTAGE (V) 1070/71 G10 1070/71 G11 *AVERAGE LT1070 POWER SUPPLY CURRENT IS 1070/71 G12 *UNDER VERY LOW OUTPUT CURRENT FOUND BY MULTIPLYING DRIVER CURRENT BY CONDITIONS, DUTY CYCLE FOR MOST DUTY CYCLE, THEN ADDING QUIESCENT CURRENT CIRCUITS WILL APPROACH 10% OR LESS
Normal/Flyback Mode Threshold on Feedback Pin Shutdown Mode Supply Current Error Amplifier Transconductance
500 –24 200 5000 ∆I 490 –22 g 180 4500 m = (VC PIN) ∆V (FB PIN) FEEDBACK PIN CURRENT ( 480 –20 160 4000 470 –18 µA) 140 µmho) 3500 FEEDBACK PIN VOLTAGE 460 –16 (AT THRESHOLD) 120 3000 TJ = 150°C 450 –14 100 2500 440 –12 80 2000 430 –10 µ 60 1500 SUPPLY CURRENT ( FEEDBACK PIN CURRENT A) – 55°C ≤ TJ ≤ 125°C FEEDBACK PIN VOLTAGE (mV) 420 – 8 (AT THRESHOLD) 40 TRANSCONDUCTANCE ( 1000 410 – 6 20 500 400 – 4 0 0 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 70 80 90 100 –75 – 50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) V TEMPERATURE ( C PIN VOLTAGE (mV) °C) 1070/71 G13 1070/71 G14 1070/71 G14
Idle Supply Current Shutdown Thresholds vs Temperature Feedback Pin Clamp Voltage
400 – 400 11 500 VC = 0.6V 10 450 350 CURRENT –350 (OUT OF VC PIN) 9 400 300 –300 V – 55°C C PIN CURRENT ( 8 350 250 –250 7 VSUPPLY = 60V 300 25°C 200 –200 6 250 VOLTAGE V 150°C SUPPLY = 3V 150 –150 5 200 PIN VOLTAGE (mV) µ C A) V 4 150 100 –100 FEEDBACK VOLTAGE (mV) IDLE SUPPLY CURRENT (mA) V 3 100 C VOLTAGE IS REDUCED UNTIL 50 REGULATOR CURRENT DROPS – 50 2 50 BELOW 300µA 0 0 1 0 – 75 – 50 – 25 0 25 50 75 100 125 150 –75 – 50 –25 0 25 50 75 100 125 150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 TEMPERATURE (°C) TEMPERATURE (°C) FEEDBACK CURRENT (mA) 1070/71 G16 1070/71 G14 1070/71 G18 10701fe 5
