Analog Devices ADP2121 Evaluation Board ADP2121-1.82-EVALZ ADP2121-1.82-EVALZ Data Sheet

 

Evaluation Board User Guide

UG-199

 

 

Rev. 0 | Page 1 of 8 

 evaluation board is a complete 6 MHz, low 

quiescent current, step-down dc-to-dc converter application 
capable of producing up to a 600 mA output current at the 
1.8 V, 1.82 V, 1.85 V, 1.875 V, and 2.3 V fixed output voltages. 
The converter operates with an input voltage in the 2.3 V to 5.5 V 
range. 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. For 
light load currents, the state of the MODE pin determines the 
operating mode of the converter. In forced PWM mode, the 
converter continues operating in PWM for light loads. 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. The evaluation board demonstrates 
the operation and performance of the ADP2121 as well as its 
compatibility with tiny ceramic components for a small area 
solution. 

This user guide includes I/O descriptions, setup instructions, 
the evaluation board schematic, and the printed circuit board 
(PCB) layout drawings for the ADP2121 evaluation board.  

Complete specifications for the ADP2121 are available in the 
ADP2121 data sheet available from Analog Devices, Inc., and 
should be consulted in conjunction with this user guide when 
using the evaluation board. 

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 Guaranteed by design. The maximum output current guarantee for 2.3 V to 

2.5 V increases linearly from 300 mA to 500 mA. The maximum output 
current guarantee for 2.5 V to 2.7 V increases linearly from 500 mA to 
600 mA. For greater than 2.7 V, the maximum output current guarantee is 
600 mA.