LM21212-1EVM: 1.2V @ 12A, 2.95 ~ 5.5V in

Summary

This evaluation board provides a solution to examine the high efficiency LM21212-1 buck switching regulator. The LM21212-1 is capable of driving up to 12A of continuous load current with excellent output voltage accuracy due to its ±1% internal reference.

This device also features a clock synchronization input that allows the switching frequency to be synchronized to an external clock source. The 300 kHz to 1.5 MHz frequency synchronization range enables the user to minimize the power stage component size, while still allowing for high efficiency.

The LM21212-1 is capable of down converting from an input voltage between 2.95V and 5.5V. Fault protection features include current limit, output power good, and output over-voltage protection. The dual function softstart/ tracking pin can be used to control the startup response of the LM21212-1, and the precision enable pin can be used to easily sequence the LM21212-1 in applications with sequencing requirements.

The power stage and compensation components of the LM21212-1 evaluation board have been optimized for an input voltage of 5V, but for testing purposes, the input can be varied across the entire operating range. The output voltage of the evaluation board is nominally 1.2V, but this voltage can be easily changed to any voltage between 0.6V and VIN by modifying the feedback resistor network.

Specifications

Manufacturer Texas Instruments
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number 296-49666-ND
Eval Board Supplier Texas Instruments
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1.2 V
Current Out 12 A
Voltage In 2.95 ~ 5.5 V
Efficiency @ Conditions >90%, 5V in, 1.2V @ 1.5 ~ 10 A (500 kHz)
>88%, 5V in, 1.2V @ 1 ~ 12 A (500 kHz)
Voltage Out Range 0.6 ~ Vin
Features Current Limit (Adj. or Fixed)
Over Voltage Protection
Power Good Output
Shutdown, Enable, Standby
Soft Start
Synchronizable
Thermal Protection
Under Voltage Protection, Brown-Out
Voltage Tracking
Switching Frequency 500 kHz
Standby Current [Typical] 50 µA
Quiescent Current [Typical] 1.5 mA
Component Count + Extras 22 + 6
Internal Switch Yes
Design Author Texas Instruments
Application / Target Market FPGA / DSP / Processors
Point of Load (PoL)
RF / Wireless
Telecom
Standby Current [Maximum] 70 µA
Quiescent Current [Maximum] 3 mA
Main I.C. Base Part LM21212-1
Date Created By Author 2011-03
Date Added To Library 2012-02

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