DC1780A-C: 1.0 ~ 2.5V @ 100A, 4.5 - 16V in

Summary

Demonstration circuit 1780A-C features poly phase design using the LTMR4620EV, the high efficiency, high density, dual 13A, switch mode step-down power module regulator. The input voltage is from 4.5V to 16V. The output voltage is jumper selectable from 1.0V to 2.5V.

DC1780A-C can deliver nominal 100A output current with 4× LTM4620s in parallel. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions.

The LTM4620 on DC1780A-C always operates in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal.

The board allows the user to program how its output voltage ramps up and down through the TRACK_CONTROL pin. The output voltage is tightly regulated between VOUT + and VOUT– through remote output voltage sensing which improves output voltage regulation at heavy loads.

These features and the availability of the LTM4620EV in a compact 15mm × 15mm × 4.41mm LGA package make it ideal for use in many high density point-of-load regulation applications.

The LTM4620 data sheet must be read in conjunction with this demo manual prior to working on or modifying the demo circuit, DC1780A-C.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC1780A-C-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 V 1.2 V 1.5 V 1.8 V 2.5 V
Current Out	100 A
Voltage In	4.5 ~ 16 V
Efficiency @ Conditions	>90%, 5V in, 2.5V @ 12 ~ 100 A >90%, 5V in, 1.8V @ 20 ~ 90 A >90%, 5V in, 1.5V @ 25 ~ 68 A >85%, 5V in, 1.2V @ 10 ~ 100 A >85%, 12V in, 2.5V @ 25 ~ 100 A >85%, 12V in, 1.8V @ 25 ~ 100 A >85%, 12V in, 1.5V @ 25 ~ 100 A >83%, 12V in, 1.2V @ 30 ~ 100 A >82%, 5V in, 1.0V @ 10 ~ 100 A >80%, 12V in, 1.0V @ 25 ~ 100 A
Voltage Out Range	1 ~ 2.5 V
Features	Current Foldback Protection Current Limit (Adj. or Fixed) Current Sharing Over Current Protection Over Voltage Protection Power Good Output Shoot-Through Protection (Overlap) Synchronizable Thermal Protection Voltage Tracking
Switching Frequency	500 kHz
Standby Current [Typical]	50 µA
Quiescent Current [Typical]	65 mA
Component Count + Extras	104 + 57
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Computers Memory Back-up Servers Telecom
Standby Current [Maximum]
Quiescent Current [Maximum]
Main I.C. Base Part	LTM4620
Date Created By Author	2012-02
Date Added To Library	2013-04