DC1895A: 2 Ch. 1.2V ~ 1.8V + 2.5V ~ 5V @ 3A (x2), 3 ~ 20V in

Summary

Demonstration circuit DC1895 is a dual output regulator consisting of two constant-frequency step-down converters, based on the LTC3633A monolithic dual channel synchronous buck regulator. The DC1895 has an input voltage range of 3.6V to 20V, with each regulator capable of delivering up to 3A of output current.

The DC1895 can operate in either Burst Mode® operation or forced continuous mode. In shutdown, the DC1895 can run off of less than 15μA total. The DC1895 is a very efficient circuit: over 90% for either circuit.

The DC1895 uses the 28-Pin QFN LTC3633AEUFD package, which has an exposed pad on the bottom-side of the IC for better thermal performance.

These features, plus a programmable operating frequency range from 500kHz to 4MHz (2MHz switching frequency with the RT pin connected to INTVCC), make the DC1895 demo board an ideal circuit for use industrial or distributed power applications.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	DC1895A-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) 1.2V, 1.5V, or 1.8V, #2) 2.5V, 3.3V, or 5V
Current Out	3A per Channel
Voltage In	3 ~ 20 V
Efficiency @ Conditions	>85%, 12V in, 3.3V @ 0.03 ~ 3 A (1 MHz) >85%, 12V in, 1.8V @ 0.1 ~ 3 A (1 MHz) >82%, 12V in, 1.8V @ 0.1 ~ 3 A (2 MHz) >80%, 12V in, 3.3V @ 0.03 ~ 3 A (2 MHz)
Voltage Out Range	0.6 ~ 6 V
Features	Current Limit (Adj. or Fixed) Over Voltage Protection Power Good Output Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Voltage Reference Voltage Tracking
Switching Frequency	1 ~ 2 MHz
Standby Current [Typical]	13 µA
Quiescent Current [Typical]	1.3 mA
Component Count + Extras	20 + 40
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Point of Load (PoL) Portable Devices Power: Auxiliary Power Supply
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part	LTC3633A
Date Created By Author	2012-10
Date Added To Library	2015-07