DC1453A: 1.8V and 3.3V @ 4A, 4.5 ~ 28V in

Summary

Demonstration circuit 1453A features the LTM®4619EV, the high input voltage, high efficiency, high density, dual 4A step-down power module. Derating is necessary for certain VIN, VOUT, and thermal conditions.

The two outputs are interleaved with 180° phase to minimize the input ripple and reduce the input capacitors. A minimum design only requires the bulk input and output capacitors and voltage setting resistors.

The LTM4619EV features output voltage tracking, power good indicator, RUN pin control, clock synchronization and soft-start programming. Protection features include foldback current limiting and overvoltage protection. Burst Mode® operation or pulse skipping mode can be selected for better light load efficiency.

The LTM4619 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit 1453A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	DC1453A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	2 Non-Isolated
Voltage Out: Highest Current First	1.8V, 3.3V
Current Out	4A per Channel
Voltage In	4.5 ~ 28 V
Efficiency @ Conditions	>92%, 6V in, 3.3V @ 1 ~ 4 A >86%, 6V in, 1.8V @ 0.5 ~ 4 A >85%, 12V in, 3.3V @ 1 ~ 4 A >84%, 12V in, 1.8V @ 1 ~ 4 A >80%, 28V in, 1.8V @ 2 ~ 4 A
Voltage Out Range	0.8 ~ 5 V
Features	Internal Inductor Light Load Mode Over Current Protection Over Voltage Protection Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Synchronizable Voltage Tracking
Switching Frequency	500 kHz
Standby Current [Typical]	40 µA
Quiescent Current [Typical]	30 mA
Component Count + Extras	18 + 37
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Point of Load (PoL) Servers Telecom
Standby Current [Maximum]
Quiescent Current [Maximum]	40 mA
Main I.C. Base Part	LTM4619EV
Date Created By Author
Date Added To Library	2011-03