Datasheet LT3975 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 42V, 2.5A, 2MHz Step-Down Switching Regulator with 2.7µA Quiescent Current |
| Pages / Page | 24 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 295 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency at 5VOUT. Efficiency at 3.3VOUT
Model Line for this Datasheet
Text Version of Document
LT3975
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency at 5VOUT Efficiency at 3.3VOUT Efficiency at 5VOUT
100 90 100 fSW = 800kHz 95 85 90 VOUT = 5V 90 80 80 L = MSS1260-332NL 85 75 70 80 70 60 75 65 50 70 60 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 55 30 60 f 50 20 SW = 800kHz 12V FRONT PAGE APPLICATION 12V 12V 55 VOUT = 5V 24V 45 V 24V OUT = 3.3V 10 24V L = MSS1260-332NL 36V L = MSS1260-332NL 36V 36V 50 40 0 0 0.5 1 1.5 2 2.5 0 0.5 1 1.5 2 2.5 0.01 0.1 1 10 100 1000 10000 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (mA) 3975 G01 3975 G02 3975 G03
Efficiency at 3.3VOUT No-Load Supply Current No-Load Supply Current
90 4.5 10000 IN REGULATION FRONT PAGE APPLICATION 80 4.0 VOUT = 3.3V VIN = 12V V 70 OUT = 3.3V 1000 3.5 60 50 3.0 DUE TO CATCH 100 DIODE LEAKAGE 40 2.5 EFFICIENCY (%) 30 INPUT CURRENT (µA) 2.0 INPUT CURRENT (µA) 20 10 FRONT PAGE APPLICATION 12V 10 V 1.5 OUT = 3.3V 24V L = MSS1260-332NL 36V 0 1.0 1 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 45 –55 –25 5 35 65 95 125 155 LOAD CURRENT (mA) INPUT VOLTAGE (V) TEMPERATURE (°C) 3975 G03 3975 G05 3975 G06
Reference Voltage Load Regulation Line Regulation
1.230 0.20 0.05 1.225 VIN = 12V V 0.04 OUT = 5V 0.15 VOUT = 5V LOAD = 1A 1.220 0.03 1.215 0.10 0.02 1.210 (%) 0.05 (%) 1.205 0.01 OUT OUT 1.200 0 0 1.195 –0.05 –0.01 1.190 CHANGE IN V CHANGE IN V –0.02 REFERENCE VOLTAGE (V) 1.185 –0.10 –0.03 1.180 –0.15 1.175 –0.04 1.170 –0.20 –0.05 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 5 10 15 20 25 30 35 40 45 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3975 G07 3975 G08 2975 G09 3975f 4 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency at 5VOUT Efficiency at 3.3VOUT Efficiency at 5VOUT
100 90 100 fSW = 800kHz 95 85 90 VOUT = 5V 90 80 80 L = MSS1260-332NL 85 75 70 80 70 60 75 65 50 70 60 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 65 55 30 60 f 50 20 SW = 800kHz 12V FRONT PAGE APPLICATION 12V 12V 55 VOUT = 5V 24V 45 V 24V OUT = 3.3V 10 24V L = MSS1260-332NL 36V L = MSS1260-332NL 36V 36V 50 40 0 0 0.5 1 1.5 2 2.5 0 0.5 1 1.5 2 2.5 0.01 0.1 1 10 100 1000 10000 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (mA) 3975 G01 3975 G02 3975 G03
Efficiency at 3.3VOUT No-Load Supply Current No-Load Supply Current
90 4.5 10000 IN REGULATION FRONT PAGE APPLICATION 80 4.0 VOUT = 3.3V VIN = 12V V 70 OUT = 3.3V 1000 3.5 60 50 3.0 DUE TO CATCH 100 DIODE LEAKAGE 40 2.5 EFFICIENCY (%) 30 INPUT CURRENT (µA) 2.0 INPUT CURRENT (µA) 20 10 FRONT PAGE APPLICATION 12V 10 V 1.5 OUT = 3.3V 24V L = MSS1260-332NL 36V 0 1.0 1 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 45 –55 –25 5 35 65 95 125 155 LOAD CURRENT (mA) INPUT VOLTAGE (V) TEMPERATURE (°C) 3975 G03 3975 G05 3975 G06
Reference Voltage Load Regulation Line Regulation
1.230 0.20 0.05 1.225 VIN = 12V V 0.04 OUT = 5V 0.15 VOUT = 5V LOAD = 1A 1.220 0.03 1.215 0.10 0.02 1.210 (%) 0.05 (%) 1.205 0.01 OUT OUT 1.200 0 0 1.195 –0.05 –0.01 1.190 CHANGE IN V CHANGE IN V –0.02 REFERENCE VOLTAGE (V) 1.185 –0.10 –0.03 1.180 –0.15 1.175 –0.04 1.170 –0.20 –0.05 –55 –25 5 35 65 95 125 155 0 0.5 1 1.5 2 2.5 5 10 15 20 25 30 35 40 45 TEMPERATURE (°C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3975 G07 3975 G08 2975 G09 3975f 4 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
