Features and Benefits
- High Efficiency: Up to 95%
- 1.5A/1A Guaranteed Minimum Output Current
- Synchronizable to External Clock
- Power-On-Reset Output
- No Schottky Diodes Required
- Programmable Frequency Operation: 1.5MHz or Adjustable From 0.6MHz to 4MHz
- Low Ripple (< 35mVP-P) Burst Mode® Operation
- Low RDS(ON) Internal Switches
- Short-Circuit Protected
- VIN: 2.25V to 5.5V
- Current Mode Operation for Excellent Line and Load Transient Response
- 125μA Quiescent Current in Sleep Mode
- Ultralow Shutdown Current: IQ < 1μA
- Low Dropout Operation: 100% Duty Cycle
- 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 (3mm × 5mm) DFN and 20-Lead TSSOP Packages
The LTC3417A-1 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 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 regulation 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.
|LTC3417A||Improved Channel Matching||-|
|LTC3417A-1||Power On Reset||Recommended For New Designs|
|LTC3417A-2||Power Good||Recommended For New Designs|
- GPS/Navigation Systems
- Automotive Instrumentation
- PC Cards
- Industrial Power Supplies
- General Purpose Point of Load DC/DC
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.