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

Synchronous Buck Regulator with Output Tracking and Sequencing for FPGAs and Microprocessors

Intersil Corp. recently announced the availability of the ISL8002B synchronous buck (step-down) switching regulator, which delivers up to 2 A of continuous output current from a 2.7- to 5.5-V input supply. Its 2-MHz switching frequency provides superior transient response, and its key features—including programmable soft-start and output tracking and sequencing of FPGAs and microprocessors—increase system reliability for point-of load conversions in networking, factory automation, instrumentation, and medical equipment.Intersil ISL8002B

The ISL8002B enables greater system reliability through several innovative features. For example, the regulator’s output tracking and sequencing of FPGAs and MPUs ensures sensitive multi-rails properly start up and shutdown. In addition, its output rails are configurable for coincidental, ratio metric, or sequential settings, ensuring the FPGA or MPU’s internal ESD diodes are not biased or overstressed during rising or falling outputs. The ISL8002B’s undervoltage lockout and several other protection/stability features protect the system from damage from unwanted electrical fault events. And its unique negative current protection prevents switch failure.

The ISL8002B’s superior transient response and high level of integration enable a complete synchronous step-down DC/DC converter solution in less than a 0.10 in2 footprint. By integrating low RDS(ON) high-side PMOS and low-side NMOS MOSFETs, the buck regulator eliminates the need for a bootstrap capacitor and diode. Its high efficiency enables the use of small inductors to further reduce board space.

Features and specifications:

  • Dimensions: 2 mm × 2 mm
  • Output tracking and sequencing
  • Switching at high frequency, 2 MHz
  • High peak efficiency: up to 95%
  • Wide input voltage range: 2.7 to 5.5 V
  • Maximum output current: 2A
  • Under voltage lockout, overvoltage protection
  • Selectable PFM or PWM operation
  • Over current, short-circuit protection
  • Over temperature/thermal protection

The ISL8002B synchronous buck regulator is available in a 2 mm  × 2 mm, eight-pin TDFN package. It costs $1 in 1,000-piece quantities. The ISL8002B DEMO1Z demonstration board is available for $23.

Source: Intersil Corp.

 

 

Industry’s Smallest Dual 3A/Single 6A Step-Down Power Module

Intersil Corp. recently announced the ISL8203M, a dual 3A/single 6A step-down DC/DC power module that simplifies power supply design for FPGAs, ASICs, microprocessors, DSPs, and other point of load conversions in communications, test and measurement, and industrial systems. The module’s compact 9.0 mm × 6.5 mm × 1.83 mm footprint combined with industry-leading 95% efficiency provides power system designers with a high-performance, easy-to-use solution for low-power, low-voltage applications.INT0325_ISL8203M_Intersil_Power_Module The ISL8203M is a complete power system in an encapsulated module that includes a PWM controller, synchronous switching MOSFETs, inductors and passive components to build a power supply supporting an input voltage range of 2.85 to 6 V. With an adjustable output voltage between 0.8 and 5 V, you can use one device to build a single 6-A or dual output 3-A power supply.

Designed to maximize efficiency, the ISL8203M power module offers best-in-class 15° C/W thermal performance and delivers 6 A at 85°C without the need for heatsinks or a fan. The ISL8203M leverages Intersil’s patented technology and advanced packaging techniques to deliver high power density and the best thermal performance in the industry, allowing the ISL8203M to operate at full load over a wide temperature range. The power module also provides over-temperature, over-current and under-voltage lockout protection, further enhancing its robustness and reliability.

Features and specifications:
•       Dual 3-A or single 6-A switching power supply
•       High efficiency, up to 95°
•       Wide input voltage range: 2.85 to 6 V
•       Adjustable output range: 0.8 to 5 V
•       Internal digital soft-start: 1.5 ms
•       External synchronization up to 4 MHz
•       Overcurrent protection

The ISL8203M power module is available in a 9 mm × 6.5 mm, QFN package. It costs $5.97 in 1,000-piece quantities. The ISL8203MEVAL2Z evaluation costs $67.

Source: Intersil