DC1905A: 1, 1.2, 3.3V @ 10A, 4.7 ~ 16V in, Buck

Summary

Demonstration circuit DC1905A features the LTM®4633EY, a high efficiency, triple 10A step-down power μModule® regulator. The input voltage range is from 4.7V to 16V with common input source, or 2.375V to 16V with an external bias supply. The output voltage range is 0.8V to 1.8V for Channel 1 and Channel 2, 0.8V to 5.5V for Channel 3. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions.

The DC1905A offers access to the TRACK/SS pins allowing the user to program output tracking or soft-start period. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP4) selects pulse-skipping mode for noise sensitive applications or Burst-Mode® operation in less noise sensitive applications. Channel 1 and 2 can be connected in parallel for a single 20A output solution with optional jumper resistors.

The LTM4633 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1905A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	DC1905A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	3 Non-Isolated
Voltage Out: Highest Current First	1V, 1.2V, 3.3V
Current Out	10A per Channel
Voltage In	4.7 ~ 16 V
Efficiency @ Conditions	>93%, 5V in, 3.3V @ 1.2 ~ 10 A >88%, 16V in, 3.3 V ~ 4 ~ 10 A >84%, 5V in, 1.2V @ 1.6 ~ 10 A >80%, 5V in, 1.0V @ 1.2 ~ 10 A >75%, 16V in, 1.2V @ 3.6 ~ 10 A >70%, 16V in, 1.0V @ 2.8 ~ 10 A
Voltage Out Range	(Ch 1 & 2) 0.8 ~1.8 V, (Ch 3) 0.8 ~ 5.5 V
Features	Current Limit (Adj. or Fixed) Current Sharing Over Current Protection Over Voltage Protection Power Good Output Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Voltage Tracking
Switching Frequency	750 kHz
Standby Current [Typical]	50 µA
Quiescent Current [Typical]	45 mA
Component Count + Extras	30 + 37
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Networking Point of Load (PoL) Power: Industrial Power Telecom
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part	LTM4633
Date Created By Author	2013-06
Date Added To Library	2015-07