Datasheet LT8614 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current |
| Pages / Page | 24 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Dropout Voltage. Switching … |
| Revision | E |
| File Format / Size | PDF / 1.5 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Dropout Voltage. Switching Frequency. Burst Frequency. Minimum Load to Full Frequency
Text Version of Document
LT8614
TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Switching Frequency Burst Frequency
800 740 1200 RT = 60.4k FRONT PAGE APPLICATION 700 730 VIN = 12V 1000 VOUT = 5V 600 720 800 500 710 400 700 600 300 690 400 DROPOUT VOLTAGE (mV) 200 680 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 200 100 670 0 660 0 0 0.5 1 1.5 2 2.5 3 3.5 4 –50 –25 0 25 50 75 100 125 150 0 50 100 150 200 LOAD CURRENT (A) TEMPERATURE (°C) LOAD CURRENT (mA) 8614 G19 8614 G20 8614 G21
Minimum Load to Full Frequency (SYNC DC High) Frequency Foldback Soft-Start Tracking
100 800 1.2 FRONT PAGE APPLICATION VOUT = 3.3V VOUT = 5V 700 VIN = 12V 80 fSW = 1MHz VSYNC = 0V 1.0 600 RT = 60.4k 0.8 60 500 400 0.6 40 300 FB VOLTAGE (V) 0.4 LOAD CURRENT (mA) 200 20 SWITCHING FREQUENCY (kHz) 0.2 100 0 0 0 5 10 15 20 25 30 35 40 45 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 INPUT VOLTAGE (V) FB VOLTAGE (V) TR/SS VOLTAGE (V) 8614 G22 8614 G23 8614 G24
Soft-Start Current PG High Thresholds PG Low Thresholds
2.6 12.0 –7.0 VSS = 0.5V 11.5 –7.5 2.5 (%) (%) REF 11.0 REF –8.0 2.4 10.5 –8.5 2.3 FB RISING 10.0 –9.0 FB RISING 2.2 9.5 –9.5 –10.0 2.1 9.0 FB FALLING FB FALLING SS PIN CURRENT (µA) 8.5 –10.5 2.0 8.0 –11.0 1.9 PG THRESHOLD OFFSET FROM V 7.5 PG THRESHOLD OFFSET FROM V –11.5 1.8 7.0 –12.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8614 G25 8614 G26 8614 G27 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Switching Frequency Burst Frequency
800 740 1200 RT = 60.4k FRONT PAGE APPLICATION 700 730 VIN = 12V 1000 VOUT = 5V 600 720 800 500 710 400 700 600 300 690 400 DROPOUT VOLTAGE (mV) 200 680 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 200 100 670 0 660 0 0 0.5 1 1.5 2 2.5 3 3.5 4 –50 –25 0 25 50 75 100 125 150 0 50 100 150 200 LOAD CURRENT (A) TEMPERATURE (°C) LOAD CURRENT (mA) 8614 G19 8614 G20 8614 G21
Minimum Load to Full Frequency (SYNC DC High) Frequency Foldback Soft-Start Tracking
100 800 1.2 FRONT PAGE APPLICATION VOUT = 3.3V VOUT = 5V 700 VIN = 12V 80 fSW = 1MHz VSYNC = 0V 1.0 600 RT = 60.4k 0.8 60 500 400 0.6 40 300 FB VOLTAGE (V) 0.4 LOAD CURRENT (mA) 200 20 SWITCHING FREQUENCY (kHz) 0.2 100 0 0 0 5 10 15 20 25 30 35 40 45 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 INPUT VOLTAGE (V) FB VOLTAGE (V) TR/SS VOLTAGE (V) 8614 G22 8614 G23 8614 G24
Soft-Start Current PG High Thresholds PG Low Thresholds
2.6 12.0 –7.0 VSS = 0.5V 11.5 –7.5 2.5 (%) (%) REF 11.0 REF –8.0 2.4 10.5 –8.5 2.3 FB RISING 10.0 –9.0 FB RISING 2.2 9.5 –9.5 –10.0 2.1 9.0 FB FALLING FB FALLING SS PIN CURRENT (µA) 8.5 –10.5 2.0 8.0 –11.0 1.9 PG THRESHOLD OFFSET FROM V 7.5 PG THRESHOLD OFFSET FROM V –11.5 1.8 7.0 –12.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8614 G25 8614 G26 8614 G27 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
