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LM3754 Scheda tecnica(PDF) 5 Page - Texas Instruments |
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LM3754 Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 47 page LM3754 www.ti.com SNVS789B – JANUARY 2012 – REVISED APRIL 2013 Operating Ratings (1) (continued) Thermal Data Junction-to-Ambient Thermal Resistance ( θJA), WQFN-32 Package (2) 26.4°C/W (2) Tested on a four layer JEDEC board. Four vias provided under the exposed pad. See JEDEC standards JESD51-5 and JESD51-7. Electrical Characteristics Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of −5°C to +125°C. Minimum and Maximum limits are specified 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 VVIN = 12V, VVDD = 5V, VVCC = internal LDO, VEN = 2V, RFRQ = 78.7 kΩ, VPH = 0V, VCS1 = VCS2 = VCSM = VSS = VSNSP = 1.8V, VILIM − VCSM = 100 mV, VSNSM = VSYNC = 0V, VSYNCOUT floating. Symbol Parameter Conditions Min Typ Max Units System Accuracy VOUT Output Voltage Accuracy VOUT = 3.6V –0.65 –0.11 0.45 % Includes trimmed EA and diff VOUT = 2.5V –0.75 –0.134 0.6 % amplifier offset and gain errors; VOUT = 1.8V –0.9 –0.165 0.7 % 0.5 mA load at VDIF VOUT = 0.6V –2.25 –0.4 1.25 % Phase Current Equalization ΔIPH Current Equalization (from VCSM = 1.8V, VCS1 = VCS2 = VCSM + 30 mV, –12 12 % average per phase current) VIAVE = 740 mV, VCOMP = 1.9V System Supplies and UVLO VIN IVIN VIN Operating Current 2-phase switching gate drivers unloaded 15 mA IVIN-Q VIN Quiescent Current VFB = 650 mV, no PWM switching, 9 18 mA NBASE is floating (no NPN) IVIN-SD VIN Shutdown Current VEN = 0V 200 450 µA VCC VVCC VCC Linear Regulator Output 0 to 3 mA sourced to an external load; 4.25 4.35 4.45 V Voltage VVIN = 5.5V to 18V IVCC VCC Input Current from External VVIN = 5.5V, VVCC = 5.5V 10 20 mA Supply IVCC-SD VCC Input Shutdown Current VEN = 0V, VVIN = 12V, VVCC = 5V 260 µA from External Supply IVCC-LIM VCC Output Current Limit VVCC = 2.5V 9 30 53 mA VVCC = 0V 50 VVCC-EN VCC UVLO Thresholds VVCC Rising 4.04 4.14 4.24 V VVCC Falling 3.9 4 4.1 VVCC-HYS VCC Threshold Hysteresis 140 mV tD-VCC VCC UVLO/UVP Debounce Time 8 µs VDD, NBASE, BOOT1, BOOT2, SW1, SW2 VVDD VDD Controller Regulation VVIN = 6V to 18V 4.6 4.85 5.1 V Voltage VNBASE VIN-to-NBASE Dropout VVIN − 5.5V, 700 mV source connected from 330 mV VDD to NBASE, INBASE = 5 mA VVIN − 5.5V, 700 mV source connected from 130 VDD to NBASE, INBASE = 1 mA VNBASE-REG NBASE Load Regulation VVIN = 18V, 700 mV source connected from 4 mV VDD to NBASE, INBASE steps 1 mA to 5 mA IVDD VDD Operating Current from VVDD = VVIN = VVCC = 5.5V, fSW = 300 kHz, 1 mA External Power Supply Gate Drivers unloaded IVDD-SD VDD Shutdown Current VEN = 0V, VVIN = 12V, VVDD = 5V 2 30 µA INBASE-CL NBASE Current Limit VNBASE = VVDD + 0.7V, ΔVVDD = −100 mV 5.8 10 mA VNBASE = VVDD = 0V 20 Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3754 |
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