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LT3501 Datasheet(PDF) 1 Page - Linear Technology |
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LT3501 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT3501 1 3501fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Monolithic Dual Tracking 3A Step-Down Switching Regulator The LT®3501 is a dual current mode PWM step-down DC/DC converter with two internal 3.5A switches. Inde- pendent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking/sequencing requirements. Both converters are synchronized to either a common external clock input or a resistor programmable fixed 250kHz to 1.5MHz internal oscillator. At all frequencies, a 180° phase relationship between channels is maintained, reducing voltage ripple and component size. Programmable frequency allows for optimization between efficiency and external component size. Minimum input-to-output voltage ratios are improved by allowing the switch to stay on through multiple clock cycles, only switching off when the boost capacitor needs recharging, resulting in ~95% maximum duty cycle. Each output can be independently disabled using its own soft-start pin, or by using the SHDN pin the entire part can be placed in a low quiescent current shutdown mode. The LT3501 is available in a 20-lead TSSOP package with exposed leadframe for low thermal resistance. ■ DSP Power Supplies ■ Disc Drives ■ DSL/Cable Modems ■ Wall Transformer Regulation ■ Distributed Power Regulation ■ Wide Input Range: 3.1V to 25V ■ Two Switching Regulators with 3A Output Capability ■ Independent Supply to Each Regulator ■ Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 1.5MHz ■ Antiphase Switching ■ Outputs Can be Paralleled ■ Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs ■ Independent Soft-Start and Power Good Pins ■ Enhanced Short-Circuit Protection ■ Low Dropout: 95% Maximum Duty Cycle ■ Low Shutdown Current: <10µA ■ 20-Lead TSSOP Package with Exposed Leadframe 3.3V and 1.8V Dual 3A Step-Down Converter with Output Tracking , LT, LTC, and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. SHDN 4.7 µF 47 µF 24.9k 61.9k 8.06k 470pF 10pF 47pF 40.2k 4.7 µH 3.3 µH VOUT1 3.3V 3A VOUT2 1.8V 3A VIN 12V 0.47 µF B360A B360A 100 µF 0.47 µF PMEG4005 PMEG4005 VIN1 VIN2 LT3501 GND BST1 SW1 IND1 VOUT1 PG1 FB1 VC1 SS/TRACK1 RT/SYNC BST2 SW2 IND2 VOUT2 PG2 FB2 VC2 SS/TRACK2 10k 8.06k 3501 TA01a 0.1 µF 470pF 40.2k LOAD CURRENT (A) 0 0 20 40 60 0.5 1 1.5 2 3501 TA01b 2.5 80 100 10 30 50 70 90 3 VOUT1 = 5V VOUT1 = 3.3V VOUT1 = 2.5V VOUT1 = 1.8V VIN = 12V IOUT2 = 0A FREQUENCY = 500kHz Efficiency |
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