DC1280A: +12V @ 0.3A, -12V @ 0.2A, 4.5 ~ 10V in


Demonstration circuit 1280A is a dual output converter featuring the LT3471EDD in Boost and Inverter configurations. Both converters are powered from the same 4.5V to 10V input source. The Boost converter puts out 12V at 300mA and the Inverter -12V at 200mA. The demo circuit demonstrates small size and low component count.

The LT3471 operates with inputs as high as 16V but in this demo board the input is limited by the magnitude of the Boost output. In a Boost converter the input needs to be less than the output.

The DC1280A is designed so that the Inverting converter can easily be configured as a Boost. Instructions are included in the schematic.

Both circuits are designed to demonstrate the soft start feature, advantages of the 1.2MHz switching frequency and the internal 42V/1.3A switches.

Both outputs on this demo board can be modified for higher voltages. These circuits are intended for space-conscious applications such as digital cameras, cellular phones, palmtop computers PC cards, miniature disk drives, xDSL power supplies, flash memory products, local 5V or 12V supplies and LCD displays.


Manufacturer Analog Devices Inc.
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Part Number DC1280A-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Topology Step Up
Outputs and Type 2 Non-Isolated
Voltage Out: Highest Current First ±12V
Current Out 300mA, 200mA
Voltage In 4.5 ~ 10 V
Efficiency @ Conditions >84%, 4.5V in, 12V @ 60 ~ 300 mA
>74%, 4.5V in, -12V @ 41 ~ 200 mA
Voltage Out Range 11.64 ~ 12.36 V, -11.64 ~ -12.36 V
Features Current Limit (Adj. or Fixed)
PWM Interface
Shutdown, Enable, Standby
Soft Start
Switching Frequency 1.2 MHz
Standby Current [Typical] 10 nA
Quiescent Current [Typical] 2.5 mA
Component Count + Extras 22 + 12
Internal Switch Yes
Design Author Linear Technology
Application / Target Market Cell Phones
Digital Cameras
LCD and OLED Bias Supplies
Point of Load (PoL)
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 4 mA
Main I.C. Base Part LT3471
Date Created By Author 2007-08
Date Added To Library 2015-08

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