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LM27403 bảng dữ liệu(PDF) 6 Page - Texas Instruments |
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LM27403 bảng dữ liệu(HTML) 6 Page - Texas Instruments |
6 / 54 page LM27403 SNVS896B – AUGUST 2013 – REVISED NOVEMBER 2014 www.ti.com 7.4 Thermal Information LM27403 THERMAL METRIC(1) RTW UNIT 24 PINS θJA Junction-to-ambient thermal resistance 32.7 θJCtop Junction-to-case (top) thermal resistance 31.2 θJB Junction-to-board thermal resistance 11.2 °C/W ψJT Junction-to-top characterization parameter 0.2 ψJB Junction-to-board characterization parameter 11.2 θJCbot Junction-to-case (bottom) thermal resistance 1.4 (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. 7.5 Electrical Characteristics Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to +125°C junction temperature range unless otherwise stated (1),(2). V VIN = 12 V and all parameters at zero power dissipation (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OPERATIONAL SPECIFICATIONS IQ Quiescent current VFB = 0.6 V (not switching) 3.5 5.0 mA IQ-SD Shutdown quiescent current VUVLO/EN = 0 V 25 45 µA REFERENCE VFB FB pin voltage accuracy 594 600 606 mV IFB FB pin bias current VFB = 0.65 V –165 0 165 nA INTERNAL UVLO UVLO Input undervoltage lockout VVIN rising, VVDD rising 2.6 2.7 2.8 V UVLO_hys UVLO hysteresis VVIN falling, VVDD falling 250 mV SWITCHING RFADJ = 4.12 kΩ 925 1050 1150 kHz FSW Switching frequency RFADJ = 20 kΩ 435 500 555 kHz RFADJ = 95.3 kΩ 185 215 250 kHz DMAX Maximum duty cycle FSW = 500 kHz 90% 93% TOFF-MIN Minimum off-time VFB = 0.5 V, FSW = 500 kHz 110 150 190 ns TON-MIN Minimum controllable on-time VFB = 0.7 V, FSW = 500 kHz 30 ns VDD SUBREGULATOR AND BOOT VDD Subregulator output voltage IVDD = 25 mA 4.2 4.7 5.3 V VDDVDO Dropout voltage IVDD = 15 mA, VVIN = 3.0 V 150 mV VDDCL VDD current limit VVDD = 4.0 V 106 mA IQBOOT CBOOT pin leakage current VCBOOT – VSW = 4.5 V 0.5 nA ERROR AMPLIFIER BW-3dB Error amplifier open-loop bandwidth 6 MHz AVOL Error amplifier dc gain 70 dB ISOURCE COMP source current VFB = 0.5 V 1 mA ISINK COMP sink current VFB = 0.7 V 100 µA VCOMP-MAX Maximum COMP voltage VFB = 0.5 V 3.9 V VCOMP-MIN Minimum COMP voltage VFB = 0.7 V 0.5 V OVERCURRENT PROTECTION Current limit comparator offset VCS_OFFSET –3.5 0 3.5 mV voltage (1) All hot and cold limits are specified by correlating the electrical characteristic to process and temperature variations and applying statistical process control. (2) The junction temperature (TJ in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD in Watts) as follows: TJ = TA + (PD × θJA) where (°C/W) is the package thermal impedance provided in the Thermal Information section. 6 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: LM27403 |
Số phần tương tự - LM27403_15 |
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Mô tả tương tự - LM27403_15 |
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