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LM3281 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LM3281 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 26 page OSCILLATOR RAMP GENERATOR OUTPUT SHORT PROTECTION THERMAL SHUTDOWN DRIVER CONTROL LOGIC PWM COMP. Ref3 Ref2 NCP OVERVOLTAGE DETECTOR ERROR AMP OLP Ref4 LIGHT-LOAD CHECK COMP ECO COMP FB GND SW VIN EN BYPASS CONTROL FB Ref1 MODE SOFT START LM3281 SNVSA38 – NOVEMBER 2014 www.ti.com 7 Detailed Description 7.1 Overview The LM3281 is a size- and performance-optimized step-down DC-DC converter for powering power amplifiers, front-end modules, wireless connectivity solutions, and a wide variety of other applications. The device complements the portfolio of SuPA (Supply for PA) products by combining small solution size, low dropout analog bypass with smooth mode transitions, very low standby current for always-on applications, very low ripple with “forced PWM” mode operation, high maximum output current, ability to drive large load capacitance while retaining transient performance, and soft start to limit start-up current. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Small Solution Size Solution size less than 7.5 mm2 is possible using the LM3281 in combination with only three small passive components. 7.3.2 Automatic Analog Bypass with Low Dropout An internal bypass transistor under analog control automatically engages as VIN falls below the VOUT target. Output stays regulated in analog bypass mode until full dropout. The parallel impedance of this additional bypass transistor with normal DC-DC output path reduces VOUT voltage drop-out, maximizing VOUT supply voltage to the load at low VIN conditions. The analog implementation provides a smooth transition among regulation and bypass modes, avoiding VOUT distortion. 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: LM3281 |
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