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LT3506 Datasheet(PDF) 1 Page - Linear Technology |
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LT3506 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3506/LT3506A 3506afb IOUT (A) 0 50 70 100 0.5 1.0 3506 TA01b 60 90 80 1.5 2.0 VIN = 5V VOUT = 1.8V VOUT = 3.3V Dual Monolithic 1.6A Step-Down Switching Regulator TheLT®3506isadualcurrentmodePWMstep-downDC/DC converter with internal 2A power switches. Both convert- ers are synchronized to a single oscillator and run with opposite phases, reducing input ripple current. The output voltages are set with external resistor dividers, and each regulatorhasindependentshutdownandsoft-startcircuits. Each regulator generates a power-good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs. TheLT3506switchingfrequencyis575kHzandtheLT3506A is 1.1MHz. These high switching frequencies allow the use of tiny inductors and capacitors, resulting in a very small dual 1.6A output solution. Constant frequency and ceramic capacitors combine to produce low, predictable output ripple voltage. With its wide input range of 3.6V to 25V, the LT3506 regulates a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies. Current mode PWM architecture provides fast transientresponsewithsimplecompensationcomponents and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection. ■ Disk Drives ■ DSP Power Supplies ■ Wall Transformer Regulation ■ Distributed Power Regulation ■ DSL Modems ■ Cable Modems ■ Wide Input Voltage Range, 3.6V to 25V ■ Two 1.6A Output Switching Regulators with Internal Power Switches ■ Constant Switching Frequency LT3506: 575kHz LT3506A: 1.1MHz ■ Anti-Phase Switching Reduces Ripple ■ Accurate 0.8V Reference, ±1% ■ Independent Shutdown/Soft-Start Pins ■ Independent Power Good Indicators Ease Supply Sequencing ■ Uses Small Inductors and Ceramic Capacitors ■ Small 16-Lead Thermally Enhanced 5mm × 4mm DFN and TSSOP Surface Mount Packages APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO Efficiency VIN 4.5V TO 25V PGOOD1 PGOOD2 3506 F01 1.5nF 22 µF 47 µF 22 µF 0.22 µF 0.22 µF 10.7k 18.7k 100k 100k 33.2k 6.4 µH 4.7 µH VOUT2 3.3V 1.6A VOUT1 1.8V 1.6A 15k D1 D2 15k 10k 1.5nF 1000pF 2200pF LT3506 VIN2 VIN1 GND 1/2 BAT-54A 1/2 BAT-54A D1, D2: ON SEMI MBR5230LT3 BOOST2 SW2 FB2 VC2 RUN/SS2 BOOST1 SW1 FB1 VC1 RUN/SS1 PGOOD1 PGOOD2 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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