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Summit Microelectronics has extended its family of programmable power manager (PPM) integrated circuits (ICs) with the SMB211 single-channel, synchronous DC/DC controller.

The SMB211 has a serial digital interface and can be easily configured during development (on-board, non-volatile memory) and reprogrammed in system by host software.

The result is claimed to be a digitally controlled power supply design that is easily customisable without tedious hardware design cycles or complex microcontroller-style software coding.

The SMB211 combines power conversion and digital control in a single, space-saving device.

The integration of advanced power control functions eliminates external components and cost, improves functionality and performance, and minimises development time.

Summit’s non-volatile configurable technology enables the implementation of flexible ‘platform solutions’ that can be modified for different designs without any hardware changes.

The SMB211 integrates a synchronous DC-DC step-down (buck) converter with a set of digital control functions.

The device’s high-current drive capability allows more than 10A of output, while using a variety of industry-standard Mosfets.

The SMB211 can operate at four different, programmable frequencies (250kHz, 500kHz, 750kHz and 1MHz) allowing optimisation of efficiency and component size.

Soft-start and power-on delays are also selectable to address various system requirements, especially in multi-power supply applications.

The SMB211’s output voltage accuracy is said to be better than +/- 1 per cent and supports dynamic voltage scaling as well as margin high/low control via the serial digital interface.

The output voltage can be digitally set from +0.5V to +2.5V in 10mV steps, or from +1.0V to +5.0V in 20mV steps.

The output voltage is monitored for both over- and under-voltage conditions, increasing system reliability.

A configurable logic output that can be used as a reset, power-good or SMBAlert output signal, is also available for notifying the system of out-of-regulation conditions.

The device can operate in forced-PWM for noise-sensitive applications, as well as in automatic PWM/PFM mode for maximum light-load efficiency.

The SMB211 incorporates a pulse-by-pulse current limit by monitoring the voltage drop across the upper N-FET.

Various current limit thresholds as well as several over-current response modes are available for design flexibility.

An Enable input allows the SMB211 to enter a low-power shutdown mode (less than10uA).

A standby mode, via an I2C command, is also available for reducing current consumption while keeping the serial interface active.

Additionally, the SMB211 provides complete power-system diagnostics by digitally flagging a variety of fault conditions (output OVLO, output UVLO, IC temperature, over-current, input UVLO and others).

The SMB211 operates directly from an input voltage of +4.5V to +13.5V, however, the external FETs can be powered from a lower voltage supply, as low as 3.3V, if necessary.

The rated operating temperature range is -30C to +85C.

Programming is achieved via an industry-standard serial interface and configuration data is safely stored in non-volatile OTP memory.

Summit said the SMB211 is well suited for increasingly complex consumer, computing and infrastructure electronics applications such as printers, Raid cards, ADSL/cable modems/routers, servers, switches/routers, digital televisions, digital set-top boxes (STB) and digital video recorders (DVRs).

The SMB211 is offered in a thermally-enhanced, lead-free 4 x 4mm, 24-pad QFN.

To speed user product development, Summit offers customers the SMB211EV companion evaluation board and graphical user interface (GUI) software so designers can see the features and benefits and design a prototype intelligent power supply solution with the SMB211.

This is a complete development tool that lets designers manipulate the characteristics of their systems.

The SMB211EV design kit includes menu-driven Microsoft Windows GUI software to automate programming tasks and also includes all necessary hardware to interface to the USB port of a laptop or PC.

Once a user completes design and prototyping, the SMB211EV automatically generates a HEX data file that can be transmitted to Summit for review and approval.

Summit then assigns a customer identification code to the HEX file and programs the customer’s production devices prior to final electrical test operations.

This ensures that the device will operate properly in the end application.

Summit Microelectronics

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