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LMZ14201 数据表(PDF) 5 Page - Texas Instruments |
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LMZ14201 数据表(HTML) 5 Page - Texas Instruments |
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5 / 24 page  LMZ14201 www.ti.com SNVS649D – JANUARY 2010 – REVISED JUNE 2011 Electrical Characteristics Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 24V, Vout = 3.3V Min Typ Max Symbol Parameter Conditions Units (1) (2) (1) SYSTEM PARAMETERS Enable Control(3) VEN EN threshold trip point VEN rising 1.10 1.18 1.25 V VEN-HYS EN threshold hysteresis VEN falling 90 mV Soft-Start ISS SS source current VSS = 0V 5 8 11 µA ISS-DIS SS discharge current -200 µA Current Limit ICL Current limit threshold d.c. average 1.4 1.95 3.0 A ON/OFF Timer tON-MIN ON timer minimum pulse width 150 ns tOFF OFF timer pulse width 260 ns Regulation and Over-Voltage Comparator VFB In-regulation feedback voltage VSS >+ 0.8V .777 0.798 0.818 V TJ = -40°C to 125°C IO = 1A VSS >+ 0.8V 0.786 0.802 0.818 V TJ = 25°C IO = 10 mA VFB-OV Feedback over-voltage 0.92 V protection threshold IFB Feedback input bias current 5 nA IQ Non Switching Input Current VFB= 0.86V 1 mA ISD Shut Down Quiescent Current VEN= 0V 25 μA Thermal Characteristics TSD Thermal Shutdown Rising 165 °C TSD-HYST Thermal shutdown hysteresis Falling 15 °C θJA Junction to Ambient(4) 4 layer JEDEC Printed Circuit Board, 19.3 °C/W 100 vias, No air flow 2 layer JEDEC Printed Circuit Board, No 21.5 °C/W air flow θJC Junction to Case No air flow 1.9 °C/W PERFORMANCE PARAMETERS ΔVO Output Voltage Ripple 8 mV PP ΔVO/ΔVIN Line Regulation VIN = 12V to 42V, IO= 1A .01 % ΔVO/IOUT Load Regulation VIN = 24V 1.5 mV/A η Efficiency VIN = 24V VO = 3.3V IO = 1A 92 % (1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL). (2) Typical numbers are at 25°C and represent the most likely parametric norm. (3) EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007. See AN-2024 and layout for information on device under test. (4) θJA measured on a 1.705” x 3.0” four layer board, with one ounce copper, thirty five 12 mil thermal vias, no air flow, and 1W power dissipation. Refer to PCB layout diagrams Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LMZ14201 |
类似零件编号 - LMZ14201_14 |
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类似说明 - LMZ14201_14 |
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