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Analog Devices LTC3311 | Demoboard DC3186A-C
3.3V to 1.2V at 50A, 37.5A, 25A Multiphase 2MHz Automotive Low EMI Buck Regulator
Overview
| Topology | Buck Converter |
| Input voltage | 3-5.5 V |
| Switching frequency | 1800-2200 kHz |
| Output 1 | 1.22 V / 25 A |
Description
Demonstration Circuit 3186A features the LTC®3311 12.5A, low voltage synchronous step-down Silent Switcher® operating as a multiphase 2MHz, 3V to 5.5V input, 1.2V buck regulator. The DC3186A has three build options to provide a two phase 25A, three phase 37.5A, or four phase 50A output solution. The LTC3311 supports adjustable output voltages from 0.5V to VIN and operating frequencies from 500kHz up to 5MHz in multiphase operation. All phases of DC3186A operate in forced continuous mode.The DC3186A 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 Efficiency vs Load graph shows the efficiency of the circuit with a 3.3V input for all three build options.An on-board transient circuit is included to measure fast transient performance.The LTC3311 data sheet gives a complete description of the part, its operation, and application information. The data sheet must be read in conjunction with this demo manual. The LTC3311 is assembled in a 3mm × 3mm LQFN package with exposed pads for low thermal resistance.
Features
- Pin Compatible with LTC3310/LTC3310S and LTC3311S
- Silent Switcher® Architecture:
- Ultralow EMI Emissions
- High Efficiency—4.5mΩ NMOS and 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
- Precision 400mV Enable Threshold, 1µA in Shutdown
- 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
- Distributed DC Power Systems (POL), Servers, Telecom Power Supplies, FPGA, ASIC, µP Core Supplies
- Industrial
- Communications
- Automotive
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Type | Pins | Mount | L(mm) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MPSB EMI Multilayer Power Suppression Bead, 100 Ω, 160 Ω | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | Impedance @ 100 MHz100 Ω | Maximum Impedance160 Ω | Maximum Impedance1100 MHz | Rated Current8000 mA | Impedance @ 1 GHz150 Ω | Height2.3 mm | TypeHigh Current | – | MountSMT | Length4.5 mm | – | Operating Temperature -55 °C up to +125 °C | ||||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | Rated Current3000 mA | – | – | – | Pins2 | – | – | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins3 | MountTHT | Length6 mm | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |