1 Amp Synchronous, Step-Down DC-to-DC Converter

The ADP2105 ADP2106 ADP2107 are low quiescent current, synchronous, Step-down dc-to-dc converters in a compact 4 mm 4 mm LFCSP_VQ 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-ADJ is adjustable from 0.8 V to the input voltage, whereas the ADP2105 ADP2106 ADP2107-xx are available in preset output voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 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 A 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.
Applications Mobile handsets Portable media players PDAs and palmtop computers Digital Cameras Smart Phones GPS
Data Sheet, Rev. A, 3/07
By Analog Devices, Inc.
ADP2105 's PackagesADP2105 's pdf datasheet

ADP2105 Pinout, Pinouts
ADP2105 pinout,Pin out
This is one package pinout of ADP2105,If you need more pinouts please download ADP2105's pdf datasheet.

ADP2105 Application circuits
ADP2105 circuits
This is one application circuit of ADP2105,If you need more circuits,please download ADP2105's pdf datasheet.

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