Datasheet LT3690 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator with 70μA Quiescent Current |
| Pages / Page | 30 / 6 — Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 1.2 Mb |
| Document Language | English |
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Switch Current Limit. vs Duty Cycle. vs Temperature
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LT3690
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Switch Current Limit Switch Current Limit vs Duty Cycle vs Temperature Switch Voltage Drop vs ISW
8 8.0 0.6 7.5 0.5 7.0 7 V DUTY CYCLE = 10% FB > 0.75V 6.5 0.4 6.0 DUTY CYCLE = 90% TAGE DROP (V) 6 5.5 0.3 5.0 0.2 V 4.5 5 FB = 0V HS SWITCH CURRENT LIMIT (A) HS SWITCH CURRENT LIMIT (A) 4.0 HS SWITCH VOL 0.1 3.5 4 3.0 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 DUTY CYCLE (%) TEMPERATURE (°C) SWITCH CURRENT (A) 3690 G09 3690 G08 3690 G10
Boost Diode Drop (VBIAS – VBST) Catch Diode Voltage Drop BST Pin Current vs ISW vs IBST (VGND – VSW) vs ISW
120 1.4 8 7 100 1.2 6 1.0 80 5 0.8 60 TAGE DROP (V) 4 0.6 3 40 BST PIN CURRENT (mA) 0.4 SWITCH CURRENT (A) 2 20 BST DIODE VOL 0.2 1 0 0 0 0 1 2 3 4 5 6 0 0.5 1 1.5 2 2.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 SWITCH CURRENT (A) BST DIODE CURRENT (A) VOLTAGE DROP (V) 3690 G11 3690 G12 3690 G13
Minimum Input Voltage Minimum Input Voltage vs Load Current vs Load Current Maximum VIN for Fixed Frequency
6.5 5.0 40 VOUT = 5V VOUT = 3.3V L = 4.7µH L = 4.7µH 35 ƒ = 600kHz ƒ = 600kHz 6.0 4.5 30 LIMITED BY T 5.5 4.0 25 J = 125°C TAGE (V) TAGE (V) TAGE (V) 20 V 5.0 3.5 OUT = 3.3V 15 L = 3.3µH INPUT VOL INPUT VOL INPUT VOL ƒ = 600kHz 10 V 4.5 3.0 SYNC > 0.8V, TA = 25°C V 5 SYNC > 0.8V, TA = 85°C VSYNC < 0.4V, TA = 25°C VSYNC < 0.4V, TA = 85°C 4.0 2.5 0 1 10 100 1000 10000 1 10 100 1000 10000 0 1 2 3 4 LOAD CURRENT (mA) LOAD CURRENT (mA) SWITCH CURRENT (A) 3690 G14 3690 G15 3690 G16 3690fb 6 For more information www.linear.com/LT3690 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 Revision History Typical Application Related Parts
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Switch Current Limit Switch Current Limit vs Duty Cycle vs Temperature Switch Voltage Drop vs ISW
8 8.0 0.6 7.5 0.5 7.0 7 V DUTY CYCLE = 10% FB > 0.75V 6.5 0.4 6.0 DUTY CYCLE = 90% TAGE DROP (V) 6 5.5 0.3 5.0 0.2 V 4.5 5 FB = 0V HS SWITCH CURRENT LIMIT (A) HS SWITCH CURRENT LIMIT (A) 4.0 HS SWITCH VOL 0.1 3.5 4 3.0 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 DUTY CYCLE (%) TEMPERATURE (°C) SWITCH CURRENT (A) 3690 G09 3690 G08 3690 G10
Boost Diode Drop (VBIAS – VBST) Catch Diode Voltage Drop BST Pin Current vs ISW vs IBST (VGND – VSW) vs ISW
120 1.4 8 7 100 1.2 6 1.0 80 5 0.8 60 TAGE DROP (V) 4 0.6 3 40 BST PIN CURRENT (mA) 0.4 SWITCH CURRENT (A) 2 20 BST DIODE VOL 0.2 1 0 0 0 0 1 2 3 4 5 6 0 0.5 1 1.5 2 2.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 SWITCH CURRENT (A) BST DIODE CURRENT (A) VOLTAGE DROP (V) 3690 G11 3690 G12 3690 G13
Minimum Input Voltage Minimum Input Voltage vs Load Current vs Load Current Maximum VIN for Fixed Frequency
6.5 5.0 40 VOUT = 5V VOUT = 3.3V L = 4.7µH L = 4.7µH 35 ƒ = 600kHz ƒ = 600kHz 6.0 4.5 30 LIMITED BY T 5.5 4.0 25 J = 125°C TAGE (V) TAGE (V) TAGE (V) 20 V 5.0 3.5 OUT = 3.3V 15 L = 3.3µH INPUT VOL INPUT VOL INPUT VOL ƒ = 600kHz 10 V 4.5 3.0 SYNC > 0.8V, TA = 25°C V 5 SYNC > 0.8V, TA = 85°C VSYNC < 0.4V, TA = 25°C VSYNC < 0.4V, TA = 85°C 4.0 2.5 0 1 10 100 1000 10000 1 10 100 1000 10000 0 1 2 3 4 LOAD CURRENT (mA) LOAD CURRENT (mA) SWITCH CURRENT (A) 3690 G14 3690 G15 3690 G16 3690fb 6 For more information www.linear.com/LT3690 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 Revision History Typical Application Related Parts
