ADP2118-EVALZ: 1.2V @ 3A, 2.3 ~ 5.5V in

Summary

The evaluation (demo) board provides an easy way to evaluate the ADP2118 buck regulator. This data sheet describes how to quickly set up the board to begin collecting performance data. Full details on the ADP2118 are available in the ADP2118 data sheet, which is available from Analog Devices, Inc., and should be consulted in conjunction with this data sheet when using the evaluation board.

This data sheet also describes the design process for the ADP2118 buck regulator, including external component selection, and how to obtain the best dynamic performance. Thermal performance is described, which provides a current derating reference for the user when the ADP2118 is operating at different ambient temperatures.

The ADP2118 is a low quiescent current, synchronous, step-down, dc-to-dc regulator in a compact 4 mm × 4 mm LFCSP_WQ package. It uses a current mode, constant frequency pulse width modulation (PWM) control scheme for excellent stability and transient response. Under light loads, the ADP2118 can be configured to operate in pulse frequency modulation (PFM) mode that reduces switching frequency to save power.

The ADP2118 runs from input voltages of 2.3V to 5.5V. The ADP2118 requires minimal external parts and provides a high efficiency solution with its integrated power switch, synchronous rectifier, and internal compensation. Other key features include under-voltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	ADP2118-EVALZ-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	1.2 V
Current Out	3 A
Voltage In	2.3 ~ 5.5 V
Efficiency @ Conditions	>92%, 5V in, 3.3V @ 0.4 ~ 3 A >90%, 5V in, 2.5V @ 0.5 ~ 3 A >89%, 3.3V in, 2.5V @ 0.1 ~ 3 A >87%, 5V in, 1.8V @ 0.5 ~ 3 A >86%, 3.3V in, 1.8V @ 0.2 ~ 3 A >85%, 5V in, 1.5V @ 0.4 ~ 3 A >84%, 3.3V in, 1.5V @ 0.2 ~ 3 A >83%, 5V in, 1.2V @ 0.3 ~ 3 A >81%, 5V in, 1.0V @ 0.3 ~ 3 A >81%, 3.3V in, 1.2V @ 0.2 ~ 3 A >80%, 3.3V in, 1.0V @ 0.2 ~ 2.8 A
Voltage Out Range	0.6 ~ Vin
Features	Current Limit (Adj. or Fixed) Over Voltage Protection PFM or PWM Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Under Voltage Protection, Brown-Out Voltage Tracking
Switching Frequency	600 kHz 1.2 MHz
Standby Current [Typical]	300 nA
Quiescent Current [Typical]	100 µA
Component Count + Extras	13 + 18
Internal Switch	Yes
Design Author	Analog Devices
Application / Target Market	Medical Point of Load (PoL) Portable Devices Power: Industrial Power RF: Metering Servers Telecom
Standby Current [Maximum]	3 µA
Quiescent Current [Maximum]	150 µA
Main I.C. Base Part	ADP2118
Date Created By Author	2010-01
Date Added To Library	2013-11