Analog Devices LTC3311S

Description

The LTCR3311S is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 12.5A of output current from a 2.25V to 5.5V input supply. The device employs Silent Switcher 2 architecture with internal hot loop bypass capacitors to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. For systems with higher power requirements, multi-phasing parallel converters is readily implemented. The LTC3311S 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, 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-lead 3mm x 3mm LQFN package.

Features

• Silent Switcher®2 Architecture:Ultralow EMI Emissions
• High Efficiency—4.5mΩ NMOS & 16mΩ 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 in Forced Continuous Mode
• Thermally-Enhanced 3mm × 3mm LQFN Package
• AEC-Q100 Qualified for Automotive Applications

Typical applications

• Communications
• Servers, Telecom Power Supplies, Distributed DC Power Systems (POL), FPGA, ASIC, μP Core Supplies
• Industrial
• Automotive

More information

• Datasheet
• IC product information