DC1472A: 1.2 ~ 5V @ 6A, 4.5 ~ 26.5V in, Inductor On-Chip

Summary

Demonstration circuit 1472 features the LTM®4618EV μModule® regulator, a complete high efficiency synchronous buck regulator. The DC1472 input range is from 4.5V to 26.5V and is capable of delivering up to 6A of output current. However, current derating may be necessary under certain VIN, VOUT, frequency and thermal conditions.

The output voltage for the board is jumper programmable from 1.2V to 5V and can be set as low as 0.8V, the reference voltage of the LTM4618EV.

Layout is simple, requiring only a few bulk input and output capacitors externally.

The TRACK/SS pin allows the user to program the output voltage ramp-up and ramp-down, as well as coincidentally or ratiometrically track an external voltage. The LTM4618EV may be enabled or disabled by the RUN pin.

The MODE jumper (JP3) is available to select from pulse-skipping or Burst Mode® operation for improved efficiency at light load. DC1472 has a default switching frequency of 500 kHz and is synchronizable to an external clock from 250 kHz up to 750 kHz.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC1472A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	1.2 V 1.5 V 1.8 V 2.5 V 3.3 V 5 V
Current Out	6 A
Voltage In	4.5 ~ 26.5 V
Efficiency @ Conditions	>93%, 12V in, 5V @ 2 ~ 6 A >88%, 24V in, 5V @ 2 ~ 6 A >88%, 12V in, 2.5V @ 1.2 ~ 6 A >86%, 24V in, 2.5V @ 2 ~ 6 A >83%, 12V in, 1.5V @ 1 ~ 6 A >81%, 24V in, 1.5V @ 1.7 ~ 6 A
Voltage Out Range	0.8 ~ 5 V
Features	Internal Inductor Light Load Mode Over Current Protection Over Voltage Protection Power Good Output Shutdown, Enable, Standby Soft Start Synchronizable Voltage Tracking
Switching Frequency	500 kHz
Standby Current [Typical]	80 µA
Quiescent Current [Typical]	26 µA
Component Count + Extras	20 + 43
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Computers Medical Point of Load (PoL) Telecom
Standby Current [Maximum]
Quiescent Current [Maximum]
Main I.C. Base Part	LTM4618EV
Date Created By Author
Date Added To Library	2011-03