600 mA, 6 MHz Synchronous Step-Down DC-to-DC Converter
The ADP2121 is a high frequency, low quiescent current step-down dc-to-dc converter optimized for portable applications in which board area and battery life are critical constraints. The 6 MHz operating frequency enables the use of tiny ceramic induc-tors and capacitors. Additionally, the synchronous rectification improves efficiency and results in fewer external components.
At high load currents, the device uses a voltage regulating pulse-width modulation (PWM) mode that maintains a constant frequency with excellent stability and transient response. In forced PWM mode, the converter continues operating in PWM for light loads. At light load conditions in auto mode, the ADP2121 can automatically enter a power-saving mode that uses pulse-frequency modulation (PFM) to reduce the effective switching frequency and ensure the longest battery life in portable applications. During logic controlled shutdown (EN ≤ 0.4 V), the input is disconnected from the output and draws less than 0.3 μA current (typical) from the source.
The ADP2121 has an input voltage range of 2.3 V to 5.5 V (2.9 V to 5.5 V for VOUT = 2.3 V), allowing the use of a single Li+/Li− polymer cell, 3-cell alkaline or Ni-MH cell, and other standard power sources. The converter can source up to 600 mA and is internally compensated to minimize external components. Other key features, such as cycle-by-cycle peak current limit, soft start, undervoltage lockout (UVLO), output-to-ground short-circuit protection, and thermal shutdown, protect the internal and external circuit components.
- Mobile phones
- Digital cameras
- Digital audio
- Portable equipment
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.
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.