Features and Benefits
- Input supply voltage range: 2.15 V to 6.50 V
- Operates down to 2.00 V
- Ultralow 240 nA quiescent current with no load
- Selectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V
- ±1.5% output accuracy over the full temperature range in pulse-width modulation (PWM) mode
- Selectable hysteresis mode or PWM operation mode
- Output current
- Up to 50 mA in hysteresis mode
- Up to 500 mA in PWM mode
- VINOK flag to monitor input battery voltage
- Ultrafast stop switching control
- 100% duty cycle operation mode
- 2 MHz switching frequency with optional synchronization input from 1.5 MHz to 2.5 MHz
- See data sheet for additional features
The ADP5302 is a high efficiency, ultralow quiescent current step-down regulator that draws only 240 nA quiescent current to regulate the output at no load.
The ADP5302 runs from an input voltage of 2.15 V to 6.50 V, allowing the use of multiple alkaline or NiMH cells, Li-Ion cells, or other power sources. The output voltage is selectable from 0.8 V to 5.0 V by an external VID resistor and a factory fuse. The total solution requires only four tiny external components.
The ADP5302 can operate between hysteresis mode and PWM mode via the SYNC/MODE pin. In hysteresis mode, the regulator achieves excellent efficiency at less than 1 mW and provides up to 50 mA of output current. In PWM mode, the regulator produces a lower output ripple and supplies up to 500 mA of output current. The flexible configuration capability during operation of the device enables very efficient power management to meet both long battery life and low system noise requirements.
The ADP5302 integrates an ultralow power comparator with a factory programmable voltage reference to monitor the input battery voltage. The regulator runs at a 2 MHz switching frequency in PWM mode, and the SYNC/MODE pin can be synchronized to an external clock from 1.5 MHz to 2.5 MHz.
The ADP5302 includes an extra STOP pin that can temporarily disable the regulator switching; in this way, a quiet system environment can be achieved to benefit the noise sensitive circuitry, which includes data conversion, RF data transmission, and analog sensors.
Other key features in the ADP5302 include separate enabling, QOD, and safety features, such as overcurrent protection (OCP), thermal shutdown (TSD), and input undervoltage lockout (UVLO).
The ADP5302 is available in a 10-lead, 3 mm × 3 mm LFCSP package rated for the -40°C to +125°C junction temperature range.
- Energy (gas, water) metering
- Portable and battery-powered equipment
- Medical applications
- Keep-alive power supply
Markets & Technology
- Clinical Monitoring
- ECG Patient Monitoring
- EEG Measurement
- Medical Isolation and Patient Safety
- NiBP based on BCG and PPG
- NiBP based on ECG and PPG
- Respiration Measurement
- Health, Wellness and Fitness
- Portable Blood Analyzer
- Body Composition Measurement
- Body-Worn Insulin Pump
- Motion Sensing/Fall Detection
- Sport Watch
- Wearable Health Monitor
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The ADP5302 is an ultralow power, synchronous step-down dc-to-dc regulator with a load switch in a 10-lead LFCSP package. The ADP5302 runs from input voltages of 2.15 V to 6.50 V and requires minimal external components to provide a high efficiency solution with an integrated power switch, synchronous rectifier, and internal compensation.
The ADP5302-EVALZ evaluation board provides an easy way to evaluate the device. The user guide UG-880 describes how to quickly set up the board to collect performance data.
Complete information about the ADP5302 is available in the ADP5302 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.
Sample & Buy
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.