Datasheet LT3481 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current |
| Pages / Page | 24 / 3 — The. ELECTRICAL CHARACTERISTICS. denotes the specifi cations which apply … |
| File Format / Size | PDF / 315 Kb |
| Document Language | English |
The. ELECTRICAL CHARACTERISTICS. denotes the specifi cations which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT3481
The ELECTRICAL CHARACTERISTICS
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations 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 ● 3 3.6 V Quiescent Current from VIN VRUN/SS = 0.2V 0.01 0.5 μA VBIAS = 3V, Not Switching ● 22 60 μA VBIAS = 0, Not Switching 75 120 μA Quiescent Current from BIAS VRUN/SS = 0.2V 0.01 0.5 μA VBIAS = 3V, Not Switching ● 50 120 μA VBIAS = 0, Not Switching 0 5 μA Minimum Bias Voltage 2.7 3 V Feedback Voltage 1.25 1.265 1.29 V ● 1.24 1.265 1.3 V FB Pin Bias Current (Note 3) VFB = 1.25V, VC = 0.4V ● 30 100 nA FB Voltage Line Regulation 4V < VIN < 34V 0.002 0.02 %/V Error Amp gm 330 μMho Error Amp Gain 800 VC Source Current 65 μA VC Sink Current 85 μA VC Pin to Switch Current Gain 3.5 A/V VC Clamp Voltage 2 V Switching Frequency RT = 8.66k 2.5 2.8 3.1 MHz RT = 29.4k 1.25 1.4 1.55 MHz RT = 187k 250 300 350 kHz Minimum Switch Off-Time ● 130 200 nS Switch Current Limit Duty Cycle = 5% 3.2 3.8 4.4 A Switch VCESAT ISW = 2A 360 mV Boost Schottky Reverse Leakage VSW = 10V, VBIAS = 0V 0.02 2 μA Minimum Boost Voltage (Note 4) ● 1.5 2.1 V BOOST Pin Current ISW = 1A 18 35 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 122 mV PG Hysteresis 5 mV PG Leakage VPG = 5V 0.1 1 μA PG Sink Current VPG = 3V ● 100 600 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the –40°C to 125°C temperature range. The LT3481H may cause permanent damage to the device. Exposure to any Absolute specifi cations are guaranteed over the –40°C to 150°C operating Maximum Rating condition for extended periods may affect device temperature range. High junction temperatures degrade operating reliability and lifetime. lifetimes. Operating lifetime is derated at junction temperatures greater
Note 2:
The LT3481E is guaranteed to meet performance specifi cations than 125°C. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
Note 3:
Bias current fl ows into the FB pin. temperature range are assured by design, characterization and correlation
Note 4:
This is the minimum voltage across the boost capacitor needed with statistical process controls. The LT3481I specifi cations are to guarantee full saturation of the switch. 3481fc 3
The ELECTRICAL CHARACTERISTICS
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations 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 ● 3 3.6 V Quiescent Current from VIN VRUN/SS = 0.2V 0.01 0.5 μA VBIAS = 3V, Not Switching ● 22 60 μA VBIAS = 0, Not Switching 75 120 μA Quiescent Current from BIAS VRUN/SS = 0.2V 0.01 0.5 μA VBIAS = 3V, Not Switching ● 50 120 μA VBIAS = 0, Not Switching 0 5 μA Minimum Bias Voltage 2.7 3 V Feedback Voltage 1.25 1.265 1.29 V ● 1.24 1.265 1.3 V FB Pin Bias Current (Note 3) VFB = 1.25V, VC = 0.4V ● 30 100 nA FB Voltage Line Regulation 4V < VIN < 34V 0.002 0.02 %/V Error Amp gm 330 μMho Error Amp Gain 800 VC Source Current 65 μA VC Sink Current 85 μA VC Pin to Switch Current Gain 3.5 A/V VC Clamp Voltage 2 V Switching Frequency RT = 8.66k 2.5 2.8 3.1 MHz RT = 29.4k 1.25 1.4 1.55 MHz RT = 187k 250 300 350 kHz Minimum Switch Off-Time ● 130 200 nS Switch Current Limit Duty Cycle = 5% 3.2 3.8 4.4 A Switch VCESAT ISW = 2A 360 mV Boost Schottky Reverse Leakage VSW = 10V, VBIAS = 0V 0.02 2 μA Minimum Boost Voltage (Note 4) ● 1.5 2.1 V BOOST Pin Current ISW = 1A 18 35 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 122 mV PG Hysteresis 5 mV PG Leakage VPG = 5V 0.1 1 μA PG Sink Current VPG = 3V ● 100 600 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the –40°C to 125°C temperature range. The LT3481H may cause permanent damage to the device. Exposure to any Absolute specifi cations are guaranteed over the –40°C to 150°C operating Maximum Rating condition for extended periods may affect device temperature range. High junction temperatures degrade operating reliability and lifetime. lifetimes. Operating lifetime is derated at junction temperatures greater
Note 2:
The LT3481E is guaranteed to meet performance specifi cations than 125°C. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
Note 3:
Bias current fl ows into the FB pin. temperature range are assured by design, characterization and correlation
Note 4:
This is the minimum voltage across the boost capacitor needed with statistical process controls. The LT3481I specifi cations are to guarantee full saturation of the switch. 3481fc 3
