Datasheet LT3640 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| Pages / Page | 24 / 3 — The. denotes the specifications which apply over the full operating |
| File Format / Size | PDF / 523 Kb |
| Document Language | English |
The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT3640
elecTrical characTerisTics
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VIN2 = 3.3V, EN/UVLO = 12V, EN2 = 3.3V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Undervoltage Lockout Threshold l 3.6 4 V VIN Undervoltage Release Threshold l 3.8 4.2 V VIN Overvoltage Lockout Threshold l 35 36.5 38 V VIN Overvoltage Release Threshold l 34 35.5 37 V Quiescent Current from VIN EN/UVLO = 0.3V 0.1 1 µA Not Switching 275 375 µA EN/UVLO Threshold Voltage 1.2 1.26 1.3 V EN/UVLO High Bias Current EN/UVLO = Threshold + 60mV 2 µA EN/UVLO Low Bias Current EN/UVLO = Threshold – 60mV 0.1 µA SYNC Input Frequency 0.35 2.5 MHz SYNC Threshold Voltage 0.4 0.8 1 V Switching Frequency RT = 32.4k l 1.75 2 2.35 MHz RT = 182k l 450 500 550 kHz FB1 Voltage l 1.24 1.265 1.29 V FB1 Bias Current FB1 = 1.265V 30 100 nA FB1 Line Regulation 5V < VIN < 30V 0.001 %/V SW1 Minimum Off-Time 70 100 ns SW1 VCESAT ISW1 = 800mA 400 mV SW1 Leakage Current 0.1 1 µA SW1 Current Limit FB1 = 1V (Note 3) l 2.2 2.8 3.4 A FB1 = 0.1V 1.8 A DA Current limit FB1 = 1V (Note 4) l 1.35 1.7 2.2 A FB1 = 0.1V 1 A BST Pin Current ISW1 = 800mA 30 50 mA Minimum BST-SW Voltage 2 2.7 V ΔFB1 to Start LV Channel 80 100 130 mV ΔFB1 Hysteresis to Stop LV Channel 30 50 90 mV VIN2 Minimum Operating Voltage l 2.3 2.5 V VIN2 Maximum Operating Voltage l 5.5 V EN2 Threshold Voltage 0.3 1 1.5 V FB2 Voltage l 588 600 612 mV FB2 Bias Current FB2 = 0.6V 0 100 nA FB2 Line Regulation 2.5V < VIN2 < 5.5V 0.01 %/V SW2 Minimum Off-Time 70 100 ns SW2 PMOS Current Limit (Note 5) l 1.5 1.9 2.2 A SW2 NMOS Current Limit (Note 5) l 1.2 1.6 2 A SW2 PMOS RDS(ON) ISW2 = 0.5A (Note 6) 275 mΩ SW2 NMOS RDS(ON) ISW2 = 0.5A (Note 6) 200 mΩ ΔFB2 to Enable PGOOD 20 40 80 mV ΔFB2 Hysteresis to Disable PGOOD 20 40 80 mV PGOOD Voltage FB2 = 0.6V, IPGOOD = 1mA 200 320 mV 3640f Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
elecTrical characTerisTics
The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VIN2 = 3.3V, EN/UVLO = 12V, EN2 = 3.3V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Undervoltage Lockout Threshold l 3.6 4 V VIN Undervoltage Release Threshold l 3.8 4.2 V VIN Overvoltage Lockout Threshold l 35 36.5 38 V VIN Overvoltage Release Threshold l 34 35.5 37 V Quiescent Current from VIN EN/UVLO = 0.3V 0.1 1 µA Not Switching 275 375 µA EN/UVLO Threshold Voltage 1.2 1.26 1.3 V EN/UVLO High Bias Current EN/UVLO = Threshold + 60mV 2 µA EN/UVLO Low Bias Current EN/UVLO = Threshold – 60mV 0.1 µA SYNC Input Frequency 0.35 2.5 MHz SYNC Threshold Voltage 0.4 0.8 1 V Switching Frequency RT = 32.4k l 1.75 2 2.35 MHz RT = 182k l 450 500 550 kHz FB1 Voltage l 1.24 1.265 1.29 V FB1 Bias Current FB1 = 1.265V 30 100 nA FB1 Line Regulation 5V < VIN < 30V 0.001 %/V SW1 Minimum Off-Time 70 100 ns SW1 VCESAT ISW1 = 800mA 400 mV SW1 Leakage Current 0.1 1 µA SW1 Current Limit FB1 = 1V (Note 3) l 2.2 2.8 3.4 A FB1 = 0.1V 1.8 A DA Current limit FB1 = 1V (Note 4) l 1.35 1.7 2.2 A FB1 = 0.1V 1 A BST Pin Current ISW1 = 800mA 30 50 mA Minimum BST-SW Voltage 2 2.7 V ΔFB1 to Start LV Channel 80 100 130 mV ΔFB1 Hysteresis to Stop LV Channel 30 50 90 mV VIN2 Minimum Operating Voltage l 2.3 2.5 V VIN2 Maximum Operating Voltage l 5.5 V EN2 Threshold Voltage 0.3 1 1.5 V FB2 Voltage l 588 600 612 mV FB2 Bias Current FB2 = 0.6V 0 100 nA FB2 Line Regulation 2.5V < VIN2 < 5.5V 0.01 %/V SW2 Minimum Off-Time 70 100 ns SW2 PMOS Current Limit (Note 5) l 1.5 1.9 2.2 A SW2 NMOS Current Limit (Note 5) l 1.2 1.6 2 A SW2 PMOS RDS(ON) ISW2 = 0.5A (Note 6) 275 mΩ SW2 NMOS RDS(ON) ISW2 = 0.5A (Note 6) 200 mΩ ΔFB2 to Enable PGOOD 20 40 80 mV ΔFB2 Hysteresis to Disable PGOOD 20 40 80 mV PGOOD Voltage FB2 = 0.6V, IPGOOD = 1mA 200 320 mV 3640f Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts
