LTC1909-8
Analog Devices
Demonstration circuit 475 is a step-down converter featuring the LTC1909-8 synchronous current mode switching controller.
Design DocumentAnalog
DC475A: LTC1909-8 Step-Down DC/DC Converter with SMBus Programming
Quick start guide for the DC475 demonstration circuit featuring the LTC1909-8, a step-down converter with SMBus-programmable output voltage and 10A current rating.
Overview
This design document describes the DC475 demonstration circuit, which utilizes the LTC1909-8 synchronous current mode switching controller. The step-down converter operates from an input voltage range of 7.5V to 21V and supports programmable output voltages (typically 1.3V to 2.2V, up to 3.5V) via 5-bit VID codes using a 2-wire SMBus interface. The design uses MOSFET Rdson for current sensing and is rated for 10A, with capabilities up to 15A. The guide includes setup procedures, SMBus protocol examples, performance summaries, and details on the integrated dynamic load step test circuit.
Use Cases
- SMBus-controlled voltage regulation
- Microprocessor core power supplies
- High-current step-down conversion
- Programmable power systems
- Evaluating LTC1909-8 performance
Topics
LTC1909-8
DC475A
Step-down converter
SMBus
VID code
Synchronous switching controller
DC/DC converter
Current mode control
Analog Devices
Voltage Identification
Referenced Parts
| LTC1909-8 | Analog Devices | Demonstration circuit 475 is a step-down converter featuring the LTC1909-8 synchronous current mode switching controller. |