Features and Benefits
- Extremely high 97% efficiency
- Ultralow quiescent current: 20 μA
- 1.2 MHz switching frequency
- 0.1 μA shutdown supply current
- Maximum load current: 1 A
- Input voltage: 2.7 V to 5.5 V
- Output voltage: 0.8 V to VIN
- Maximum duty cycle: 100%
- Smoothly transitions into low dropout (LDO) mode
- Internal synchronous rectifier
- Small 16-lead 4 mm × 4 mm LFCSP package
- Optimized for small ceramic output capacitors
- Enable/shutdown logic input
- Undervoltage lockout
- Soft start
- Supported by ADIsimPower™ design tool
The ADP2105 / ADP2106 / ADP2107 are low quiescent current, synchronous, step-down dc-to-dc converters in a compact 4 mm × 4 mm LFCSP package. At medium to high load currents, these devices use a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2105 / ADP2106 / ADP2107 use a pulse frequency modulation (PFM) control scheme under light load conditions that reduces switching frequency to save power.
The ADP2105 / ADP2106 / ADP2107 run from input voltages of 2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cells, PCMCIA, and other standard power sources. The output voltage of ADP2105 / ADP2106 / ADP2107 is adjustable from 0.8 V to the input voltage (indicated by ADJ), whereas the ADP2105 / ADP2106 / ADP2107 are available in preset output voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x V). Each of these variations is available in three maximum current levels: 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. During logic controlled shutdown, the input is disconnected from the output, and it draws less than 0.1 µA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and programmable soft start to limit inrush current at startup.
- Mobile handsets
- PDAs and palmtop computers
- Telecommunication/networking equipment
- Set top boxes
- Audio/video consumer electronics
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 ADP2105 evaluation board is a complete step-down dc-to-dc converter solution using the ADP2105 step-down dc-to-dc converter. It provides a ±1% accurate (±3% over all conditions) regulated output voltage with load currents up to 1 A. It comes in two versions: the ADP2105-1.8-EVAL with fixed output voltage of 1.8 V and the ADP2105-EVAL with adjustable output voltage initially set to 2.5 V.
Tools & Simulations
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
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.