20-A Step-Down µModule Regulator Optimized for Low VIN to Low VOUT Conversion

Linear Technology Corp. recently introduced the LTM4639, which is 20-A DC/DC step-down µModule (micromodule) regulator. According to Linear, the regulator can convert “2.5 to 7 V main-power system rails to point-of-load voltages as low as 0.6 V.”

Linear Technology LTM4639

Linear Technology LTM4639

The LTM4639—which includes an inductor, DC/DC controller, MOSFETs, and compensation circuitry—is housed in a 4.92-mm BGA package with a 15 mm × 15 mm footprint. For 3.3-V input to 1.5-V output conversion at 20-A load, efficiency is 88%, power loss is 3.9 W, and junction temperature rise above ambient temperature is 37°C. The micromodule regulator provides a precise output voltage regulation. Up to four devices can be paralleled for up to 80-A output while operating out-of-phase to reduce the number of input and output capacitors.

The LTM4639’s input supply range is 2.375 to 7 V. For operation from 3.3 V and lower, a 5-V, low-power auxiliary supply is needed to bias internal circuitry. Output voltage ranges from 0.6 to 5.5 V with protection functions for overcurrent and overvoltage conditions.

The LTM4639 is rated for operation from –40°C to 125°C. The 1,000-piece price is $19.45 each.

Source: Linear Technology

Low-Power Micromodule

The ECM-DX2 is a highly integrated, low-power consumption micromodule. Its fanless operation and extended temperature are supported by the DMP Vortex86DX2 system-on-a-chip (SoC) CPU. The micromodule is targeted for industrial automation, transportation/vehicle construction, and aviation applications.
The ECM-DX2 withstands industrial operation environments for –40-to-75°C temperatures and supports 12-to-26-V voltage input. Multiple OSes, including Windows 2000/XP and Linux, can be used in a variety of embedded designs.

AvalueThe micromodule includes on-board DDR2 memory that supports up to 32-bit, 1-GB, and single-channel 24-bit low-voltage differential signaling (LVDS) as well as video graphics array (VGA) + LVDS or VGA + TTL multi-display configurations. The I/O deployment includes one SATA II interface, four COM ports, two USB 2.0 ports, 8-bit general-purpose input/output (GPIOs), two Ethernet ports, and one PS/2 connector for a keyboard and a mouse. The ECM-DX2 also provides a PC/104 expansion slot and one MiniPCIe card slot.

Contact Avalue Technology for pricing.

Avalue Technology, Inc.

Configurable Regulator

LinearThe LTM4644 quad output step-down µModule (micromodule) regulator is configurable as a single (16-A), dual (12-A, 4-A, or 8-A, 8-A), triple (8-A, 4-A, 4-A), or quad (4-A each) output regulator. This flexibility enables system designers to rely on one simple and compact µModule regulator for the various voltage and load current requirements of FPGAs, ASICs, and microprocessors as well as other board circuitry. The LTM4644 is ideal for communications, data storage, industrial, transportation, and medical system applications.

The LTM4644 regulator includes DC/DC controllers, power switches, inductors and compensation components. Only eight external ceramic capacitors (1206 or smaller case sizes) and four feedback resistors (0603 case size) are required to regulate four independently adjustable outputs from 0.6 to 5.5 V. Separate input pins enable the four channels to be powered from a common supply rail or different rails from 4 to 14 V.

At an ambient temperature of 55°C, the LTM4644 delivers up to 13 A at 1.5 V from a 12-V input or up to 14 A with 200-LFM airflow. The four channels operate at 90° out-of-phase to minimize input ripple whether at the 1-MHz default switching frequency or synchronized to an external clock between 700 kHz and 1.3 MHz. With the addition of an external bias supply above 4 V, the LTM4644 can regulate from an input supply voltage as low as 2.375 V. The regulator also includes output overvoltage and overcurrent fault protection.

The LTM4644 costs $22.85 each in 1,000-unit quantities.

Linear Technology Corp.