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LTC3417AIDHC-1-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3417AIDHC-1-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC3417A-1 1 3417a1fa Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator with POR The LTC®3417A-1 is a dual constant frequency, synchro- nous 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 frequency, 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. The open drain POR pin goes low when either output voltage falls 6% below regulation. The output will remain low 150ms longer than the duration of the out of regula- tion condition. A user selectable mode input allows the user to trade off ripple voltage for light load efficiency. Burst Mode operation 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 stress 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 100μA. In shutdown, the device draws <1μA. OUT2 Efficiency (Burst Mode Operation) FEATURES n High Efficiency: Up to 95% n 1.5A/1A Guaranteed Minimum Output Current n Synchronizable to External Clock n Power-On-Reset Output n No Schottky Diodes Required n Programmable Frequency Operation: 1.5MHz or Adjustable From 0.6MHz to 4MHz n Low Ripple (< 35mVP-P) BurstMode® Operation n Low RDS(ON) Internal Switches n Short-Circuit Protected n VIN: 2.25V to 5.5V n Current Mode Operation for Excellent Line and Load Transient Response n 125μA Quiescent Current in Sleep Mode n Ultralow Shutdown Current: IQ < 1μA n Low Dropout Operation: 100% Duty Cycle n Phase Pin Selects 2nd Channel Phase Relationship with Respect to 1st Channel n Internal Soft-Start with Individual Run Pin Control n Available in Small Thermally Enhanced (3mm × 5mm) DFN and 20-Lead TSSOP Packages APPLICATIONS n GPS/Navigation Systems n Automotive Instrumentation n PC Cards n Industrial Power Supplies n General Purpose Point of Load DC/DC DESCRIPTION L, LT, LTC and LTM and Burst Mode are registered trademarks 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. FREQ SW1 RUN1 VFB1 ITH1 SW2 RUN2 VFB2 ITH2 VIN LTC3417A-1 GND 10μF 1.5μH 2.2μH 22pF 511k 22pF 866k VIN VIN 412k 412k 22μF 5.9k 2.87k 2200pF 6800pF 3417A-1 TA01 47μF VOUT1 1.8V 1.5A VOUT2 2.5V 1A VIN 2.5V TO 5.5V RESET 100k POR LOAD CURRENT (A) 0.001 70 90 95 100 0.01 0.1 1 3417A-1 TA01a 85 80 75 0.001 0.01 0.1 1 10 0.0001 EFFICIENCY POWER LOSS REFER TO FIGURE 4 VIN = 3.6V VOUT = 2.5V FREQ = 1MHz TYPICAL APPLICATION |
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