Datasheet LT3976 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 40V, 5A, 2MHz Step-Down Switching Regulator with 3.3μA Quiescent Current |
| Pages / Page | 28 / 5 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 422 Kb |
| Document Language | English |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Reference Voltage. Load Regulation. Line Regulation
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Text Version of Document
LT3976
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Reference Voltage Load Regulation Line Regulation
1.230 0.5 0.05 VIN = 12V 1.225 V 0.4 V OUT = 5V OUT = 3.3V 0.04 LOAD = 1A 1.220 0.3 0.03 1.215 0.2 1.210 0.02 0.1 1.205 0.01 1.200 0 0 1.195 –0.1 –0.01 1.190 –0.2 –0.02 1.185 CHANGE IN OUTPUT (%) REFERENCE VOLTAGE (V) CHANGE IN OUTPUT (%) –0.3 1.180 –0.03 –0.4 1.175 –0.04 1.170 –0.5 –0.05 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 5 10 15 20 25 30 35 40 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 3976 G07 3976 G08 3976 G09
Thermal Derating Thermal Derating Switch Current Limit
6 6 10.0 5 5 9.5 12V H-GRADE 12V 24V H-GRADE 4 24V 36V 4 9.0 36V 3 3 8.5 I-GRADE I-GRADE LOAD CURRENT (A) 2 LOAD CURRENT (A) 2 CURRENT LIMIT (A) 8.0 1 VOUT = 3.3V 1 VOUT = 5V 7.5 fSW = 400kHz fSW = 400kHz 2.5in × 2.5in 4-LAYER BOARD 2.5in × 2.5in 4-LAYER BOARD 0 0 7.0 0 25 50 75 100 125 150 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1.0 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE LIMITED BY MAXIMUM 3976 G10 LIMITED BY MAXIMUM 3976 G11 3976 G12 JUNCTION TEMPERATURE JUNCTION TEMPERATURE ΘJA = 40°C/W ΘJA = 40°C/W
Switch Current Limit Current Limit Foldback Soft-Start
12 10 10 10 30% DUTY CYCLE 30% DUTY CYCLE 9 VSS = 3V 8 7 6 5 4 CURRENT LIMIT (A) 3 2 1 30% DUTY CYCLE 30% DUTY CYCLE V 0 0 0.2 0.4 0.6 0.8 1.0 1.2 FB PIN VOLTAGE (V) 3976 G14 FB = 1V 9 V 9 SS = 3V 11 8 8 VFB = 0V 7 7 10 6 6 9 5 5 4 4 CURRENT LIMIT (A) 8 CURRENT LIMIT (A) 3 CURRENT LIMIT (A) 3 2 2 7 1 1 6 0 0 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.5 1.0 1.5 2.0 2.5 TEMPERATURE (°C) FB PIN VOLTAGE (V) SS PIN VOLTAGE (V) 3976 G13 3976 G14 3976 G15 3976f For more information www.linear.com/3976 5 Document Outline Features Applications Description 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. Reference Voltage Load Regulation Line Regulation
1.230 0.5 0.05 VIN = 12V 1.225 V 0.4 V OUT = 5V OUT = 3.3V 0.04 LOAD = 1A 1.220 0.3 0.03 1.215 0.2 1.210 0.02 0.1 1.205 0.01 1.200 0 0 1.195 –0.1 –0.01 1.190 –0.2 –0.02 1.185 CHANGE IN OUTPUT (%) REFERENCE VOLTAGE (V) CHANGE IN OUTPUT (%) –0.3 1.180 –0.03 –0.4 1.175 –0.04 1.170 –0.5 –0.05 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 5 10 15 20 25 30 35 40 TEMPERATURE (°C) LOAD CURRENT (A) INPUT VOLTAGE (V) 3976 G07 3976 G08 3976 G09
Thermal Derating Thermal Derating Switch Current Limit
6 6 10.0 5 5 9.5 12V H-GRADE 12V 24V H-GRADE 4 24V 36V 4 9.0 36V 3 3 8.5 I-GRADE I-GRADE LOAD CURRENT (A) 2 LOAD CURRENT (A) 2 CURRENT LIMIT (A) 8.0 1 VOUT = 3.3V 1 VOUT = 5V 7.5 fSW = 400kHz fSW = 400kHz 2.5in × 2.5in 4-LAYER BOARD 2.5in × 2.5in 4-LAYER BOARD 0 0 7.0 0 25 50 75 100 125 150 0 25 50 75 100 125 150 0 0.2 0.4 0.6 0.8 1.0 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE LIMITED BY MAXIMUM 3976 G10 LIMITED BY MAXIMUM 3976 G11 3976 G12 JUNCTION TEMPERATURE JUNCTION TEMPERATURE ΘJA = 40°C/W ΘJA = 40°C/W
Switch Current Limit Current Limit Foldback Soft-Start
12 10 10 10 30% DUTY CYCLE 30% DUTY CYCLE 9 VSS = 3V 8 7 6 5 4 CURRENT LIMIT (A) 3 2 1 30% DUTY CYCLE 30% DUTY CYCLE V 0 0 0.2 0.4 0.6 0.8 1.0 1.2 FB PIN VOLTAGE (V) 3976 G14 FB = 1V 9 V 9 SS = 3V 11 8 8 VFB = 0V 7 7 10 6 6 9 5 5 4 4 CURRENT LIMIT (A) 8 CURRENT LIMIT (A) 3 CURRENT LIMIT (A) 3 2 2 7 1 1 6 0 0 –55 –25 5 35 65 95 125 155 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0.5 1.0 1.5 2.0 2.5 TEMPERATURE (°C) FB PIN VOLTAGE (V) SS PIN VOLTAGE (V) 3976 G13 3976 G14 3976 G15 3976f For more information www.linear.com/3976 5 Document Outline Features Applications Description 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
