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LM27341 数据表(PDF) 4 Page - Texas Instruments |
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LM27341 数据表(HTML) 4 Page - Texas Instruments |
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4 / 44 page  LM27341, LM27342, LM27341-Q1, LM27342-Q1 SNVS497E – NOVEMBER 2008 – REVISED APRIL 2013 www.ti.com Electrical Characteristics Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over the full Operating Temperature Range (TJ = -40°C to 125°C). VIN = 12V, and VBOOST - VSW = 4.3V unless otherwise specified. Datasheet min/max specification limits are ensured by design, test, or statistical analysis. Symbol Parameter Conditions Min Typ Max Units SYSTEM PARAMETERS TJ = 0°C to 85°C 0.990 1.0 1.010 VFB Feedback Voltage V TJ = -40°C to 125°C 0.984 1.0 1.014 Feedback Voltage Line ΔVFB/ΔVIN VIN = 3V to 20V 0.003 % / V Regulation IFB Feedback Input Bias Current 20 100 nA Over Voltage Protection, VFB at OVP 1.13 V which PWM Halts. Undervoltage Lockout VIN Rising until VSW is Switching 2.60 2.75 2.90 UVLO V UVLO Hysteresis VIN Falling from UVLO 0.30 0.47 0.6 SS Soft Start Time 0.5 1 1.5 ms Quiescent Current, IQ = IQ_AVIN + VFB = 1.1 (not switching) 2.4 mA IQ_PVIN IQ Quiescent Current, IQ = IQ_AVIN + VEN = 0V (shutdown) 70 nA IQ_PVIN fSW= 2 MHz 8.2 10 IBOOST Boost Pin Current mA fSW= 1 MHz 4.4 6 OSCILLATOR fSW Switching Frequency SYNC = GND 1.75 2 2.3 MHz FB Pin Voltage where SYNC input VFB_FOLD 0.53 V is overridden. fFOLD_MIN Frequency Foldback Minimum VFB = 0V 220 250 kHz LOGIC INPUTS (EN, SYNC) fSYNC SYNC Frequency Range 1 2.35 MHz VIL EN, SYNC Logic low threshold Logic Falling Edge 0.4 V VIH EN, SYNC Logic high threshold Logic Rising Edge 1.8 SYNC, Time Required above VIH tSYNC_HIGH 100 ns to Ensure a Logical High. SYNC, Time Required below VIL tSYNC_LOW 100 ns to Ensure a Logical Low. ISYNC SYNC Pin Current VSYNC < 5V 20 nA VEN = 3V 6 15 IEN Enable Pin Current µA VIN = VEN = 20V 50 100 INTERNAL MOSFET RDS(ON) Switch ON Resistance 150 320 m Ω ICL Switch Current Limit LM27342 2.5 4.0 A LM27341 2.0 3.7 DMAX Maximum Duty Cycle SYNC = GND 85 93 % tMIN Minimum on time 65 ns ISW Switch Leakage Current 40 nA BOOST LDO VLDO Boost LDO Output Voltage 3.9 V THERMAL TSHDN Thermal Shutdown Temperature Junction temperature rising 165 °C Thermal Shutdown Hysteresis Junction temperature falling 15 °C 4 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM27341 LM27342 LM27341-Q1 LM27342-Q1 |
类似零件编号 - LM27341_15 |
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类似说明 - LM27341_15 |
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