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LTC3417 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3417 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 20 page  1 LTC3417 3417fb ■ PDAs/Palmtop PCs ■ Digital Cameras ■ Cellular Phones ■ PC Cards ■ Wireless and DSL Modems Dual Synchronous 1.4A/800mA 4MHz Step-Down DC/DC Regulator ■ High Efficiency: Up to 95% ■ 1.4A/800mA Guaranteed Minimum Output Current ■ No Schottky Diodes Required ■ Programmable Frequency Operation: 1.5MHz or Adjustable From 0.6MHz to 4MHz ■ Low RDS(ON) Internal Switches ■ Short-Circuit Protected ■ VIN: 2.25V to 5.5V ■ Current Mode Operation for Excellent Line and Load Transient Response ■ 125 µA Quiescent Current in Sleep Mode ■ Ultralow Shutdown Current: IQ < 1µA ■ Low Dropout Operation: 100% Duty Cycle ■ Power Good Output ■ Phase Pin Selects 2nd Channel Phase Relationship with Respect to 1st Channel ■ Internal Soft-Start with Individual Run Pin Control ■ Available in Small Thermally Enhanced (5mm × 3mm) DFN and 20-Lead TSSOP Packages FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO The LTC ®3417 is a dual constant frequency, synchronous step-down DC/DC converter. Intended for medium power applications, it operates from a 2.25V to 5.5V input voltage range and has a constant programmable switching fre- quency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.8V to 5V. Internal synchronous low RDS(ON) power switches provide high efficiency without the need for external Schottky diodes. A user selectable mode input allows the user to trade off ripple voltage for light load efficiency. Burst Mode ® opera- tion provides high efficiency at light loads, while Pulse Skip mode provides low ripple noise at light loads. A phase mode pin allows the second channel to operate in-phase or 180 ° out-of-phase with respect to channel 1. Out-of- phase operation produces lower RMS current on VIN and thus lower RMS derating on the input capacitor. To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle) and both channels draw a total quiescent current of only 125 µA. In shutdown, the device draws <1µA. OUT2 Efficiency (Burst Mode Operation) , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 6144194 LOAD CURRENT (A) 0.001 70 90 95 100 0.01 0.1 1 3417 TA01a 85 80 75 0.001 0.01 0.1 1 10 0.0001 EFFICIENCY REFER TO FIGURE 4 POWER LOSS VIN = 3.6V VOUT = 2.5V FREQ = 1MHz FREQ SW1 RUN1 VFB1 ITH1 SW2 RUN2 VFB2 ITH2 VIN LTC3417 GND 10 µF 1.5 µH 2.2 µH 22pF 511k 22pF 866k VIN VIN 412k 412k 10 µF 5.9k 2.87k 2200pF 6800pF 3417 TA01 22 µF VOUT1 1.8V 1.4A VOUT2 2.5V 800mA VIN 2.5V TO 5.5V |
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