Datasheet LT3684 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 36V, 2A, 2.8MHz Step-Down Switching Regulator |
| Pages / Page | 24 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 426 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LT3684
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUNS/SS = 10V VBOOST = 15V, VBIAS = 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 VBIAS = 3V, Not Switching l 0.4 0.8 mA VBIAS = 0, Not Switching 1.2 2.0 mA Quiescent Current from BIAS VRUN/SS = 0.2V 0.01 0.5 µA VBIAS = 3V, Not Switching l 0.85 1.5 mA VBIAS = 0, Not Switching 0 0.1 mA Minimum Bias Voltage 2.7 3 V Feedback Voltage 1.25 1.265 1.28 V l 1.24 1.265 1.29 V FB Pin Bias Current (Note 3) l 30 100 nA FB Voltage Line Regulation 4V < VIN < 34V 0.002 0.02 %/V Error Amp gm 330 µMho Error Amp Gain 1000 VC Source Current 75 µA VC Sink Current 100 µA VC Pin to Switch Current Gain 3.5 A/V VC Clamp Voltage 2 V Switching Frequency RT = 8.66k 2.7 3.0 3.3 MHz RT = 29.4k 1.25 1.4 1.55 MHz RT = 187k 250 300 350 kHz Minimum Switch Off-Time l 100 150 nS Switch Current Limit Duty Cycle = 5% 3.1 3.6 4.0 A Switch VCESAT ISW = 2A 360 mV Boost Schottky Reverse Leakage VSW = 10V, VBIAS = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) l 1.6 2.1 V BOOST Pin Current ISW = 1A 18 30 mA RUN/SS Pin Current VRUN/SS = 2.5V 5 10 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 100 mV PG Hysteresis 10 mV PG Leakage VPG = 5V 0.1 1 µA PG Sink Current VPG = 0.4V l 100 300 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings with statistical process controls. The LT3684I specifications are may cause permanent damage to the device. Exposure to any Absolute guaranteed over the –40°C to 125°C temperature range. Maximum Rating condition for extended periods may affect device
Note 3:
Bias current measured in regulation. Bias current flows into the FB reliability and lifetime. pin.
Note 2:
The LT3684E is guaranteed to meet performance specifications
Note 4:
This is the minimum voltage across the boost capacitor needed to from 0°C to 85°C. Specifications over the –40°C to 85°C operating guarantee full saturation of the switch. temperature range are assured by design, characterization and correlation 3684fa For more information www.linear.com/LT3684 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUNS/SS = 10V VBOOST = 15V, VBIAS = 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 VBIAS = 3V, Not Switching l 0.4 0.8 mA VBIAS = 0, Not Switching 1.2 2.0 mA Quiescent Current from BIAS VRUN/SS = 0.2V 0.01 0.5 µA VBIAS = 3V, Not Switching l 0.85 1.5 mA VBIAS = 0, Not Switching 0 0.1 mA Minimum Bias Voltage 2.7 3 V Feedback Voltage 1.25 1.265 1.28 V l 1.24 1.265 1.29 V FB Pin Bias Current (Note 3) l 30 100 nA FB Voltage Line Regulation 4V < VIN < 34V 0.002 0.02 %/V Error Amp gm 330 µMho Error Amp Gain 1000 VC Source Current 75 µA VC Sink Current 100 µA VC Pin to Switch Current Gain 3.5 A/V VC Clamp Voltage 2 V Switching Frequency RT = 8.66k 2.7 3.0 3.3 MHz RT = 29.4k 1.25 1.4 1.55 MHz RT = 187k 250 300 350 kHz Minimum Switch Off-Time l 100 150 nS Switch Current Limit Duty Cycle = 5% 3.1 3.6 4.0 A Switch VCESAT ISW = 2A 360 mV Boost Schottky Reverse Leakage VSW = 10V, VBIAS = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) l 1.6 2.1 V BOOST Pin Current ISW = 1A 18 30 mA RUN/SS Pin Current VRUN/SS = 2.5V 5 10 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 100 mV PG Hysteresis 10 mV PG Leakage VPG = 5V 0.1 1 µA PG Sink Current VPG = 0.4V l 100 300 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings with statistical process controls. The LT3684I specifications are may cause permanent damage to the device. Exposure to any Absolute guaranteed over the –40°C to 125°C temperature range. Maximum Rating condition for extended periods may affect device
Note 3:
Bias current measured in regulation. Bias current flows into the FB reliability and lifetime. pin.
Note 2:
The LT3684E is guaranteed to meet performance specifications
Note 4:
This is the minimum voltage across the boost capacitor needed to from 0°C to 85°C. Specifications over the –40°C to 85°C operating guarantee full saturation of the switch. temperature range are assured by design, characterization and correlation 3684fa For more information www.linear.com/LT3684 3
