Compact Power Regulator Targets FPGAs, GPUs and ASICs

Analog Devices has announced the Power by Linear LTM4646, a dual 10 A or single 20 A output, step-down µModule point-of-load regulator from 5V or 12V input supply rails. The LTM4646 includes the inductors, MOSFETs, a DC/DC controller and supporting components and is housed in a 11.25 mm x 15 mm x 5.01 mm BGA package. Compared to the prior 2 x single 10 A output module solutions, the LTM4646 reduces the solution size of more than 25%.
With its dual regulator design, small package size, and precise voltage regulation, the LTM4646 meets the PCB area constraints of densely populated system boards to power low voltage and high current devices such as FPGAs, ASICs, microprocessors and GPUs. Applications include PCIe boards, communication infrastructure, cloud computing-based systems, as well as medical, industrial, and test and measurement equipment.

Total output voltage DC accuracy is guaranteed at ±1.5% over line, load and temperature (–40°C to 125°C). Moreover, the onboard remote sense amplifiers on both outputs compensate for voltage drop caused by trace impedance of the PC board due to large load currents. The LTM4646 has selectable internal or external feedback loop compensation, enabling users to optimize loop stability and transient performance while minimizing the number of output capacitors. The peak efficiency at 12 VIN to 1.0 VOUT is 86%. With 200LFM air flow, the LTM4646 delivers a full 20A  continuously up to 85°C ambient. The current mode architecture allows multiphase parallel operation to increase output current with very good current sharing.

Standalone, the LTM4646 operates from 4.5 V to 20 V input range. When 5 V external bias is available, the device can operate from 2.375 V. The output voltages are adjustable from 0.6 V to 5.5 V, enabling the device to generate not only low voltage for digital devices but also 2.5 V, 3.3 V and  5V, which are commonly needed in system bus voltages. The switching frequency can be programmed from 250 kHz to 1.3 MHz with one resistor, and can also be synchronized to an external clock ranging from 300 kHz to 1 MHz for noise-sensitive applications. Additionally, it features overvoltage and overcurrent protection. The LTM4646 operates from –40°C to 125°C.

Summary of Features: LTM4646

  •     Dual 10A or Single 20A Output
  •     Wide Input Voltage Range: 4.5V to 20V
  •     2.375VMIN with CPWR Bias
  •     Output Voltage Range: 0.6V to 5.5V
  •     ±1.5% Maximum Total DC Output Error
  •     Multiphase Current Sharing
  •     Differential Remote Sense Amplifier, Each Channel
  •     Internal or External Compensation
  •     11.25mm x 15mm x 5.01mm BGA Package
  •     BGA Ball Finishes Available: SAC305 (RoHS), SnPb (63/37)

 

Linear Technology | www.linear.com

60-V, 7-A Step-Down µModule Regulator

Linear Technology’s LTM8064 is a step-down DC/DC µModule (power module) regulator with a 6-to-58-V (60 VMAX) input voltage range and adjustable load current control with ±10% accuracy at 7 A. You can use it as a point-of-load step-down regulator operating from 24, 36, and 48 V voltage rails in test equipment, high-end computers, test equipment, avionics, and more. It also operates as a constant current source to precisely regulate and control (adjust) the load current up to 7 A when sourcing and 9.1 A when sinking. Among the  applications requiring precision load current control are Peltier devices for cooling/heating and  battery and supercapacitor chargers.Linear 8064

The LTM8064 includes DC/DC controller, MOSFETs, inductor, and supporting components. Two resistors, bulk input capacitors, and output capacitors are needed to complete the design. Housed in a 16 mm × 11.9 mm × 4.92 mm BGA package, the LTM8064 has an adjustable output voltage range of 1.2 to 36 V. The switching frequency is adjustable by one external resister from 100 kHz to 1 MHz or it can be synchronized to an external clock from 120 kHz to 1 MHz.

The LTM8064’s main features:

  • Operates from –40°C to 125°C
  • Wide input voltage range: 6 to 58 V
  • 1.2-to-36-V Output voltage
  • Constant-voltage, constant-current (CVCC)
  • Two-Quadrant: Sources and Sinks Output Current
  • Parallelable for increased output current, even from different voltage sources
  • Adjustable output current up to 7 A when sourcing or 9.1 A when sinking
  • Selectable switching frequency: 100 kHz to 1 MHz
  • Programmable soft-start
  • Tiny 16 mm × 11.9 mm × 4.92 mm surface-mount BGA package

Pricing starts at $16.50 each in 1,000-unit quantities.

Source: Linear Technology

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.
www.linear.com