Offered in a miniature QFN package, the TPS62736 DC/DC converter from Texas Instruments delivers high power conversion efficiency from 10 uA to 50 mA output currents, and consumes only 350 nA of active current and 20 nA during standby. The highly integrated Nano-Power buck converter solution is well suited to meet the special needs of ultra low power applications such as energy harvesting. The TPS62736 provides the system with an externally programmable regulated supply in order to preserve the overall efficiency of the power management stage versus a linear step down converter. This regulator is intended to step down the voltage from an energy storage element such as a battery or super cap while supplying the rail to low voltage electronics. The regulated output has been optimize to provide high efficiency across low output currents (< 10 μA) to high currents (50 mA). The TPS62736 integrates an optimized hysteretic controller for low power applications. The internal circuitry utilizes a time based sampling system in order to reduce the average quiescent current. This allows for the quiescent current consumption to scale with output load levels. With the use of only a 10 μH inductor, the solution size will be minimal. To further assist users in the strict management of their energy budgets, the TPS62736 toggles the input good flag to signal an attached microprocessor when the voltage on the input supply has dropped below a pre-set critical level. This should trigger the reduction of load currents to prevent the system from entering an under voltage condition. There is also independent enable signals to allow the system to control when to run the regulated output or even put the whole IC into an ultra-low quiescent sleep state. The input good indication and output regulator level are programmed independently via external resistors. The external resistors are periodically biased to sample and hold the reference in order to reduce the quiescent current consumption of the resistor strings. Texas Instruments
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