DC1611A: 1.2V, 1.8V, or 3.3V @ 2.5A, 3.6 ~ 15V in

Summary

Demonstration circuit 1611 is a step-down converter, using the LTC3604 monolithic synchronous buck regulator. The DC1611A has a maximum input voltage 15V, and is capable of delivering up to 2.5A of output current at a minimum input voltage of 3.6V. The output voltage of the DC1611A can be set as low as 0.6V, the reference voltage of the LTC3604. At low load currents, the DC1611A operates in discontinuous mode, and during shutdown, it consumes less than 40 uA of quiescent current. In continuous mode operation, the DC1611A is a high efficiency circuit - over 80%.

The DC1611A can track another voltage with the LTC3604 track function.

Because of the high switching frequency of the LTC3604, which is programmable up to 4 MHz, the DC1611A uses low profile surface mount components.

All these features make the DC1611A an ideal circuit for use in Lithium- Ion Battery applications and distributed power systems. Gerber files for this circuit are available. Call the LTC Factory.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC1611A-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 1.8 V 3.3 V
Current Out	2.5 A
Voltage In	3.6 ~ 15 V
Efficiency @ Conditions	>90%, 4V in, 1.8V @ 0.12 ~ 1.4 A (Forced Continuous) >90%, 4V in, 1.8V @ 0.02 ~ 1.2 A (Burst Mode) >85%, 8V in, 1.8V @ 0.16 ~ 2 A (Forced Continuous) >85%, 8V in, 1.8V @ 0.02 ~ 2 A (Burst Mode) >80%, 12V in, 1.8V @ 0.16 ~ 2.5 A (Forced Continuous) >80%, 12V in, 1.8V @ 0.02 ~ 2.5 A (Burst Mode)
Voltage Out Range	0.6 ~ 3.3 V
Features	Current Limit (Adj. or Fixed) Light Load Mode Over Voltage Protection Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Synchronizable Under Voltage Protection, Brown-Out Voltage Reference Voltage Tracking
Switching Frequency	1 MHz
Standby Current [Typical]	14 µA
Quiescent Current [Typical]	700 µA
Component Count + Extras	28 + 18
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Point of Load (PoL) Power: Auxiliary Power Supply
Standby Current [Maximum]	25 µA
Quiescent Current [Maximum]	1 mA
Main I.C. Base Part	LTC3604
Date Created By Author	2010-01
Date Added To Library	2015-07