Datasheet LT1912 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 36V, 2A, 500kHz Step-Down Switching Regulator |
| 页数 / 页 | 24 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 379 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT1912
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
Feedback Voltage 780 790 800 mV l 775 790 805 mV FB Pin Bias Current (Note 3) VFB = 0.8V, VC = 0.4V l 7 30 nA FB Voltage Line Regulation 4V < VIN < 36V 0.002 0.01 %/V Error Amp gm 25 µMho Error Amp Gain 1000 VC Source Current 45 µA VC Sink Current 45 µA VC Pin to Switch Current Gain 3.5 A/V VC Clamp Voltage 2 V Switching Frequency RT = 187k 160 200 240 kHz Minimum Switch Off-Time l 60 150 nS Switch Current Limit Duty Cycle = 5% 3.2 3.7 4.2 A Switch VCESAT ISW = 2A 500 mV Boost Schottky Reverse Leakage VSW = 10V, VBD = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) l 1.5 2.1 V BOOST Pin Current ISW = 1A 22 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 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 temperature range are assured by design, characterization and correlation may cause permanent damage to the device. Exposure to any Absolute with statistical process controls. Maximum Rating condition for extended periods may affect device
Note 3:
Bias current flows out of the FB pin. reliability and lifetime.
Note 4:
This is the minimum voltage across the boost capacitor needed to
Note 2:
The LT1912E is guaranteed to meet performance specifications guarantee full saturation of the switch. from 0°C to 125°C. Specifications over the –40°C to 125°C operating 1912fa 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
Feedback Voltage 780 790 800 mV l 775 790 805 mV FB Pin Bias Current (Note 3) VFB = 0.8V, VC = 0.4V l 7 30 nA FB Voltage Line Regulation 4V < VIN < 36V 0.002 0.01 %/V Error Amp gm 25 µMho Error Amp Gain 1000 VC Source Current 45 µA VC Sink Current 45 µA VC Pin to Switch Current Gain 3.5 A/V VC Clamp Voltage 2 V Switching Frequency RT = 187k 160 200 240 kHz Minimum Switch Off-Time l 60 150 nS Switch Current Limit Duty Cycle = 5% 3.2 3.7 4.2 A Switch VCESAT ISW = 2A 500 mV Boost Schottky Reverse Leakage VSW = 10V, VBD = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) l 1.5 2.1 V BOOST Pin Current ISW = 1A 22 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 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 temperature range are assured by design, characterization and correlation may cause permanent damage to the device. Exposure to any Absolute with statistical process controls. Maximum Rating condition for extended periods may affect device
Note 3:
Bias current flows out of the FB pin. reliability and lifetime.
Note 4:
This is the minimum voltage across the boost capacitor needed to
Note 2:
The LT1912E is guaranteed to meet performance specifications guarantee full saturation of the switch. from 0°C to 125°C. Specifications over the –40°C to 125°C operating 1912fa 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