Control VOUT of Any DC/DC Regulator with a Serial PMBus Interface

Analog Devices LTC7106

Analog Devices announces the Power by Linear™ LTC7106, a PMBus I2C controlled precision bidirectional current DAC designed to adjust the output voltage of virtually any DC/DC regulator. Through its PMBus compatible interface, the LTC7106 receives a 7-bit serial code and converts it to a bidirectional (source, sink) output current. When the current is fed into the feedback network of a regulator, its output voltage can be programmed dynamically for load power/performance optimization or margining in response to serial VID commands. Available in a 2 mm × 3 mm DFN-10 package, the LTC7106 enables small and simple solution for a wide range of discrete and modular DC/DC voltage regulators.

Analog Devices - LTC7106

Its internal power-on reset circuitry keeps the DAC output current at zero until a valid write takes place. Other features include a range bit for easy interfacing to almost any impedance resistor divider, and an open-drain output for controlling the Run or Enable pin of the regulator. To prevent abrupt changes in the DAC output current and subsequently the output voltage of the regulator, an internal digital programmable slew rate can be programmed from 500 ns/step to 3.5 ms/step.

Typical Application
Typical Application.

The LTC7106 operates over an input voltage range of 2.5 V to 5.5 V and is supported by the easy to use LTpowerPlay development tool with graphical user interface (GUI). Additional features include ±1% output current accuracy over temperature, a wide range bidirectional DAC output current from ±16 μA to ±256 μA, wide DAC operational voltage range from 0.4 V to 2 V, and a precision enable threshold to support external undervoltage lockout. Extended and industrial temperature versions are available from –40 to 125 °C.

Analog Devices - LTC7106

Summary of Features: LTC7106

  • VOUT Control of Any Regulator
  • ±1% Output Current Accuracy (–40 °C to 125 °C)
  • PMBus/I2C Compliant Serial Interface
  • Input Voltage Range: 2.5 V to 5.5 V
  • 7-Bit Programmable DAC Output Current for VOUT Control
  • Wide Range of IDAC Output Current: ±16 μA to ±256 μA
  • Programmable Slew Rate: 500 ns ~ 3.5 ms per Bit
  • High Impedance at IDAC Output When Disabled or at DAC Code Zero
  • Wide DAC Operation Output Voltage (0.4 V to 2.0 V)
  • Precision Enable Threshold to Support External UVLO
  • Available in 10-Lead 3 mm × 2 mm DFN Package

Pricing and Availability

Product Production Availability Price Each Per 1,000 Package
LTC7106 Now Starts at $1.25 3 mm × 2 mm DFN-10

1-4 Layer PCBs $2

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