New Content (1)
Features and Benefits
- Layout Compatible with LTC3310/LTC3311 Family
- Silent Switcher® Architecture
- Ultralow EMI Emissions
- High Efficiency: 3mΩ NMOS and 8mΩ PMOS
- Wide Bandwidth, Fast Transient Response
- Safely Tolerates Inductor Saturation in Overload
- VIN Range: 2.25V to 5.5V
- VOUT Range: 0.5V to VIN
- VOUT Accuracy: ±1% with Remote Sense
- Peak Current Mode Control
- Minimum On-Time: 35ns
- Programmable Frequency to 5MHz
- Shutdown Current: 1μA
- Precision 400mV Enable Threshold
- Output Soft-Start with Voltage Tracking
- Power Good Output
- Die Temperature Monitor
- Configurable for Paralleling Power Stages
- Thermally-Enhanced 3mm × 3mm LQFN Package
- AEC-Q100 Qualified for Automotive Applications
The LTC3313 is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 15A of output current from a 2.25V to 5.5V input supply. The device employs the Silent Switcher architecture to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. For systems with higher power requirements, multiphasing parallel converters is readily implemented.
The LTC3313 uses a constant frequency, peak current mode control architecture for fast transient response. A 500mV reference allows for low voltage outputs. 100% duty cycle operation delivers low drop out.
Other features include a power good signal when the output is in regulation, a precision enable threshold, output overvoltage protection, thermal shutdown, a temperature monitor, clock synchronization, mode selection, and output short circuit protection. The device is available in a compact 18-pin 3mm × 3mm LQFN package.
- Servers, Telecom Power Supplies
- Distributed DC Power Systems (POL)
- FPGA, ASIC, μP Core Supplies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The EVAL-LTC3313EV-A-Z features the LTC3313, 15 A low voltage synchronous step-down Silent Switcher® that operates as a 2 MHz, 2.25 V to 5.5 V input, 1.2 V, 15 A output buck regulator. The LTC3313 supports an output voltage (VOUT) from 0.5 V to the input voltage (VIN) with operating frequencies from 500 kHz up to 5 MHz. The LTC3313 is a compact, ultralow emission, high-efficiency, and high speed synchronous monolithic step-down switching regulator. The Silent Switcher technology optimizes fast-current loops and makes it easier to minimize electromagnetic interference (EMI) and electromagnetic compatibility (EMC) emissions. The minimum on-time of 35 ns typical enables high VIN to low VOUT conversion at a high frequency.
The EVAL-LTC3313EV-A-Z runs in forced continuous mode with a 2 MHz switching frequency (fSW); however, it can be configured to run at different switching frequencies or in pulse-skipping mode. The LTC3313 oscillator can also synchronize to an external clock using a MODE/SYNC turret, with the EVAL-LTC3313EV-A-Z default setup. Figure 4 in the user guide shows the efficiency and power loss of the EVALLTC3313EV-A-Z with a 3.3 V input in both operation modes.
The EVAL-LTC3313EV-A-Z also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the VIN EMI terminal. The EMI performance of the board-EVAL-LTC3313EV-A-Z is shown in the EMI Test Results section of the user guide. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests. The LTC3313 data sheet gives a complete description of the device and its application information. The data sheet must be read in conjunction with the evaluation board user guide. The LTC3313 is assembled in a 3 mm × 3 mm LQFN package with an exposed pad for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the LTC3313 data sheet.
Documentation & Resources
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.
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.