Datasheet LT3680 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Current |
| Pages / Page | 24 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| Revision | C |
| File Format / Size | PDF / 526 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LT3680
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V VBOOST = 15V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage l 3 3.6 V Quiescent Current from VIN VRUN/SS = 0.2V 0.01 0.5 µA VBD = 3V, Not Switching l 30 65 µA VBD = 0, Not Switching 120 160 µA Quiescent Current from BD VRUN/SS = 0.2V 0.01 0.5 µA VBD = 3V, Not Switching l 90 130 µA VBD = 0, Not Switching 1 5 µA Minimum Bias Voltage (BD Pin) 2.7 3 V Feedback Voltage 780 790 800 mV l 775 790 805 mV FB Pin Bias Current (Note 3) VFB = 0.8V, VC = 0.4V l 10 40 nA FB Voltage Line Regulation 4V < VIN < 36V 0.002 0.01 %/V Error Amp gm 500 µMho Error Amp Gain 2000 VC Source Current 60 µA VC Sink Current 60 µA VC Pin to Switch Current Gain 5.3 A/V VC Clamp Voltage 2.0 V Switching Frequency RT = 8.66k 2.2 2.45 2.7 MHz RT = 29.4k 1.0 1.1 1.25 MHz RT = 187k 200 230 260 kHz Minimum Switch Off-Time l 60 150 nS Switch Current Limit Duty Cycle = 5% 4.6 5.4 6.6 A Switch VCESAT ISW = 3.5A 335 mV Boost Schottky Reverse Leakage VBOOST = 10V, VBD = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) l 1.5 2.0 V BOOST Pin Current ISW = 1A 35 50 mA RUN/SS Pin Current VRUN/SS = 2.5V 5 8 µA RUN/SS Input Voltage High 2.5 V RUN/SS Input Voltage Low 0.2 V PG Threshold Offset from Feedback Voltage VFB Rising 65 mV PG Hysteresis 10 mV PG Leakage VPG = 5V 0.1 1 µA PG Sink Current VPG = 0.4V l 200 800 µA SYNC Low Threshold 0.5 V SYNC High Threshold 0.7 V SYNC Pin Bias Current VSYNC = 0V 0.1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the –40°C to 125°C temperature range. The LT3680H may cause permanent damage to the device. Exposure to any Absolute specifications are guaranteed over the –40°C to 150°C operating Maximum Rating condition for extended periods may affect device temerature range. High junction temperatures degrade operating lifetimes. reliability and lifetime. Operating lifetime is derated at junction temperatures greater than 125°C.
Note 2:
The LT3680E is guaranteed to meet performance specifications
Note 3:
Bias current flows out of the FB pin. from 0°C to 125°C. Specifications over the –40°C to 125°C operating
Note 4:
This is the minimum voltage across the boost capacitor needed to temperature range are assured by design, characterization and correlation guarantee full saturation of the switch. with statistical process controls. The LT3680I specifications are Rev C For more information www.analog.com 3 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
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V VBOOST = 15V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage l 3 3.6 V Quiescent Current from VIN VRUN/SS = 0.2V 0.01 0.5 µA VBD = 3V, Not Switching l 30 65 µA VBD = 0, Not Switching 120 160 µA Quiescent Current from BD VRUN/SS = 0.2V 0.01 0.5 µA VBD = 3V, Not Switching l 90 130 µA VBD = 0, Not Switching 1 5 µA Minimum Bias Voltage (BD Pin) 2.7 3 V Feedback Voltage 780 790 800 mV l 775 790 805 mV FB Pin Bias Current (Note 3) VFB = 0.8V, VC = 0.4V l 10 40 nA FB Voltage Line Regulation 4V < VIN < 36V 0.002 0.01 %/V Error Amp gm 500 µMho Error Amp Gain 2000 VC Source Current 60 µA VC Sink Current 60 µA VC Pin to Switch Current Gain 5.3 A/V VC Clamp Voltage 2.0 V Switching Frequency RT = 8.66k 2.2 2.45 2.7 MHz RT = 29.4k 1.0 1.1 1.25 MHz RT = 187k 200 230 260 kHz Minimum Switch Off-Time l 60 150 nS Switch Current Limit Duty Cycle = 5% 4.6 5.4 6.6 A Switch VCESAT ISW = 3.5A 335 mV Boost Schottky Reverse Leakage VBOOST = 10V, VBD = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) l 1.5 2.0 V BOOST Pin Current ISW = 1A 35 50 mA RUN/SS Pin Current VRUN/SS = 2.5V 5 8 µA RUN/SS Input Voltage High 2.5 V RUN/SS Input Voltage Low 0.2 V PG Threshold Offset from Feedback Voltage VFB Rising 65 mV PG Hysteresis 10 mV PG Leakage VPG = 5V 0.1 1 µA PG Sink Current VPG = 0.4V l 200 800 µA SYNC Low Threshold 0.5 V SYNC High Threshold 0.7 V SYNC Pin Bias Current VSYNC = 0V 0.1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the –40°C to 125°C temperature range. The LT3680H may cause permanent damage to the device. Exposure to any Absolute specifications are guaranteed over the –40°C to 150°C operating Maximum Rating condition for extended periods may affect device temerature range. High junction temperatures degrade operating lifetimes. reliability and lifetime. Operating lifetime is derated at junction temperatures greater than 125°C.
Note 2:
The LT3680E is guaranteed to meet performance specifications
Note 3:
Bias current flows out of the FB pin. from 0°C to 125°C. Specifications over the –40°C to 125°C operating
Note 4:
This is the minimum voltage across the boost capacitor needed to temperature range are assured by design, characterization and correlation guarantee full saturation of the switch. with statistical process controls. The LT3680I specifications are Rev C For more information www.analog.com 3 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
