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Analog Devices LTC3311-0.875 | Demoboard DC3127A
3.3V to 0.875V at 12.5A, 2MHz Automotive Low EMI Buck Regulator in a 1.04cm2 Solution
Overview
| Topology | Buck Converter |
| Input voltage | 3-3.6 V |
| Switching frequency | 1800-2200 kHz |
| Output 1 | 0.88 V / 12.5 A |
Description
Demonstration circuit 3127A features the LTC®3311-0.875,fixed 0.875V, 12.5A synchronous step-down Silent Switcher® operating as a 2MHz, 3V to 3.6V input,0.875V/12.5A output buck regulator. The LTC3311-0.875 supports fixed 0.875V output voltage with operating frequencies from 500kHz up to 5MHz. The LTC3311-0.875 is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The LTC3311-0.875 has Active Voltage Positioning (AVP) where the output voltage is dependent on load current. At light loads the output voltage is regulated above the nominal value. At full load the output voltage is regulated below the nominal value. The DC load regulation is adjusted to improve transient performance and reduce required output capacitance.DC3127A is set up to run in forced continuous mode with a 2MHz switching frequency but can be configured to run at different switching frequencies, or in pulse skip mode. The LTC3311-0.875 oscillator can also synchronize to an external clock using MODE/SYNC turret, with the DC3127 default setup. Figure 5 shows the efficiency and power loss of the DC3127A with a 3.3V input in both operation modes.
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
- Communications
- Industrial
- Automotive
- Servers, Telecom Power Supplies, Distributed DC Power Systems (POL)
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 |