Datasheet LT8650S (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| Pages / Page | 32 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Current. EN Pin … |
| Revision | B |
| File Format / Size | PDF / 3.3 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Current. EN Pin Thresholds. PG High Threshold. RT Programmed Switching
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LT8650S
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Current EN Pin Thresholds PG High Threshold
2.4 0.78 10.0 VSS = 0.4V 2.3 0.77 9.5 (%) REF 9.0 2.2 0.76 8.5 2.1 0.75 8.0 2.0 0.74 7.5 1.9 0.73 7.0 EN THRESHOLD (V) SS PIN CURRENT (µA) 6.5 1.8 0.72 6.0 1.7 0.71 EN RISING 5.5 EN FALLING PG THRESHOLD OFFSET FROM V RISING 1.6 0.70 5.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8650S G23 8650S G24 8650S G25
RT Programmed Switching PG Low Threshold Frequency Minimum Input Voltage
–5.0 150 3.0 –5.5 VIN1 = VIN2 (%) 135 REF –6.0 120 2.8 –6.5 105 –7.0 90 2.6 TAGE (V) –7.5 75 –8.0 60 2.4 –8.5 45 INPUT VOL RT PIN RESISTOR (kΩ) –9.0 30 2.2 –9.5 PG THRESHOLD OFFSET FROM V 15 FALLING –10.0 0 2.0 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCHING FREQUENCY (MHZ) TEMPERATURE (°C) 8650S G26 8650S G27 8650S G28
Temperature Monitor Pin Bias Pin Current per Channel Bias Pin Current per Channel
1.55 18.0 24 EN2 = 0V, SS1=0V, FCM fSW = 2MHz V 22 IN = 12V 1.25 17.5 LOAD = 1A LOAD = 2A 20 17.0 18 0.95 16 16.5 TAGE (V) 0.65 14 16.0 12 0.35 10 15.5 8 0.05 TEMP PIN VOL BIAS PIN CURRENT (mA) 15.0 BIAS PIN CURRENT (mA) 6 BELOW 5°C: 10kΩ RESISTOR –0.25 4 FROM TEMP TO –2V 14.5 ABOVE 5°C: FLOAT TEMP 2 –0.55 14.0 0 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 3 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHZ) 8650S G29 8650S G30 8650S G31 Rev. B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Current EN Pin Thresholds PG High Threshold
2.4 0.78 10.0 VSS = 0.4V 2.3 0.77 9.5 (%) REF 9.0 2.2 0.76 8.5 2.1 0.75 8.0 2.0 0.74 7.5 1.9 0.73 7.0 EN THRESHOLD (V) SS PIN CURRENT (µA) 6.5 1.8 0.72 6.0 1.7 0.71 EN RISING 5.5 EN FALLING PG THRESHOLD OFFSET FROM V RISING 1.6 0.70 5.0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8650S G23 8650S G24 8650S G25
RT Programmed Switching PG Low Threshold Frequency Minimum Input Voltage
–5.0 150 3.0 –5.5 VIN1 = VIN2 (%) 135 REF –6.0 120 2.8 –6.5 105 –7.0 90 2.6 TAGE (V) –7.5 75 –8.0 60 2.4 –8.5 45 INPUT VOL RT PIN RESISTOR (kΩ) –9.0 30 2.2 –9.5 PG THRESHOLD OFFSET FROM V 15 FALLING –10.0 0 2.0 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 3 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCHING FREQUENCY (MHZ) TEMPERATURE (°C) 8650S G26 8650S G27 8650S G28
Temperature Monitor Pin Bias Pin Current per Channel Bias Pin Current per Channel
1.55 18.0 24 EN2 = 0V, SS1=0V, FCM fSW = 2MHz V 22 IN = 12V 1.25 17.5 LOAD = 1A LOAD = 2A 20 17.0 18 0.95 16 16.5 TAGE (V) 0.65 14 16.0 12 0.35 10 15.5 8 0.05 TEMP PIN VOL BIAS PIN CURRENT (mA) 15.0 BIAS PIN CURRENT (mA) 6 BELOW 5°C: 10kΩ RESISTOR –0.25 4 FROM TEMP TO –2V 14.5 ABOVE 5°C: FLOAT TEMP 2 –0.55 14.0 0 –55 –25 5 35 65 95 125 155 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 3 TEMPERATURE (°C) INPUT VOLTAGE (V) SWITCHING FREQUENCY (MHZ) 8650S G29 8650S G30 8650S G31 Rev. B For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
