Ultralow Power Step-Down Regulator with Input Voltage Monitor and Regulation
The ADP5304 runs from an input voltage range of 2.15 V to 6.50 V, allowing the use of the multiple alkaline, NiMH, and Lithium cells, or the use of a high impedance power source. The output voltage is selectable from 0.8 V to 5.0 V by an external VID resistor to ground. The total solution requires only four tiny external components.
The ADP5304 operates in hysteresis mode via connecting the MODE pin to ground. In hysteresis mode, the regulator achieves excellent efficiency at a power of less than 1 mW and provides up to 50 mA of output load. The device enables very efficient power management to achieve the collection of small amounts of energy from the high impedance battery or the energy harvester to charge up the conventional capacitor or super capacitor.
The ADP5304 integrates an ultralow power comparator with a factory programmable voltage reference to monitor the voltage of the input power source. The voltage reference, with hysteresis, is the threshold for the stopping and starting of switching, allowing the use of the high impedance power source.
Other key features of the ADP5304 include separate enabling and an output discharge function (QOD). Safety features, such as overcurrent protection, thermal shutdown (TSD), and input undervoltage (UVLO), are also included.
The ADP5304 is available in 10-lead, 3 mm × 3 mm LFCSP package rated for the −40°C to +125°C junction temperature range.Applications
- Energy (gas, water) metering
- Energy harvesting applications
- Portable and battery-powered equipment
- Medical applications
- Keep-alive power supply
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The ADP5304 evaluation board with full bridge rectifier can support both an ac and dc voltage power source and regulate the input voltage as a maximum power point as the preset VINOK threshold.
The ADP5304 evaluation board provides an easy way to evaluate the device. This user guide describes how to quickly set up the board to collect performance data.
Complete information about the ADP5304 is available in the ADP5304 data sheet, which should be consulted in conjunction with this user guide when using the evaluation board.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.