Datasheet LT8653S (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | Dual Channel 2A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2μA Quiescent Current |
| Pages / Page | 30 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Switch VDS. Minimum On-Time. Minimum … |
| File Format / Size | PDF / 2.2 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Switch VDS. Minimum On-Time. Minimum Off-Time. Dropout Voltage. Switching Frequency
Text Version of Document
LT8653S
TYPICAL PERFORMANCE CHARACTERISTICS Switch VDS Minimum On-Time Minimum Off-Time
600 50 75 FCM, 1A LOAD FCM, 0.5A LOAD 45 500 70 40 35 400 65 (mV) 30 DS 300 25 60 20 SWITCH V 200 55 15 MINIMUM ON-TIME (ns) MINIMUM OFF-TIME (ns) 10 100 50 TOP FET 5 BOT FET 0 0 45 0 0.5 1 1.5 2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 IDS (A) TEMPERATURE (°C) TEMPERATURE (°C) 8653S G18 8653S G19 8653S G20
Dropout Voltage Switching Frequency Burst Frequency
1000 2.20 2.25 VOUT = 3V VIN = 12V, VOUT = 5V 900 fSW = 2MHz 2.15 2.00 SYNC = 0V R 800 T = 15kΩ 2.10 1.75 L = 2.2µH 700 1.50 600 2.05 TAGE (mV) 1.25 500 2.00 1.00 400 1.95 0.75 300 DROPOUT VOL 1.90 200 0.50 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 100 FCM 1.85 RT = 15kΩ 0.25 Burst Mode OPERATION RT = VCC 0 1.80 0 0 0.5 1 1.5 2 –55 –25 5 35 65 95 125 155 0 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) TEMPERATURE (°C) LOAD CURRENT (A) 8653S G21 8653S G22 8653S G23
Soft-Start Tracking Soft-Start Current EN Pin Thresholds
1.0 2.4 0.78 VSS = 0.4V 2.3 0.77 0.8 2.2 0.76 0.6 2.1 0.75 TAGE (V) 2.0 0.74 0.4 FB VOL 1.9 0.73 EN THRESHOLD (V) SS PIN CURRENT (µA) 1.8 0.72 0.2 INTERNAL COMPENSATION 1.7 0.71 EN RISING EXTERNAL COMPENSATION EN FALLING 0 1.6 0.70 0 0.2 0.4 0.6 0.8 1.0 1.2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8653S G24 8653S G25 8653S G26 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Switch VDS Minimum On-Time Minimum Off-Time
600 50 75 FCM, 1A LOAD FCM, 0.5A LOAD 45 500 70 40 35 400 65 (mV) 30 DS 300 25 60 20 SWITCH V 200 55 15 MINIMUM ON-TIME (ns) MINIMUM OFF-TIME (ns) 10 100 50 TOP FET 5 BOT FET 0 0 45 0 0.5 1 1.5 2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 IDS (A) TEMPERATURE (°C) TEMPERATURE (°C) 8653S G18 8653S G19 8653S G20
Dropout Voltage Switching Frequency Burst Frequency
1000 2.20 2.25 VOUT = 3V VIN = 12V, VOUT = 5V 900 fSW = 2MHz 2.15 2.00 SYNC = 0V R 800 T = 15kΩ 2.10 1.75 L = 2.2µH 700 1.50 600 2.05 TAGE (mV) 1.25 500 2.00 1.00 400 1.95 0.75 300 DROPOUT VOL 1.90 200 0.50 SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 100 FCM 1.85 RT = 15kΩ 0.25 Burst Mode OPERATION RT = VCC 0 1.80 0 0 0.5 1 1.5 2 –55 –25 5 35 65 95 125 155 0 0.1 0.2 0.3 0.4 0.5 LOAD CURRENT (A) TEMPERATURE (°C) LOAD CURRENT (A) 8653S G21 8653S G22 8653S G23
Soft-Start Tracking Soft-Start Current EN Pin Thresholds
1.0 2.4 0.78 VSS = 0.4V 2.3 0.77 0.8 2.2 0.76 0.6 2.1 0.75 TAGE (V) 2.0 0.74 0.4 FB VOL 1.9 0.73 EN THRESHOLD (V) SS PIN CURRENT (µA) 1.8 0.72 0.2 INTERNAL COMPENSATION 1.7 0.71 EN RISING EXTERNAL COMPENSATION EN FALLING 0 1.6 0.70 0 0.2 0.4 0.6 0.8 1.0 1.2 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8653S G24 8653S G25 8653S G26 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
