LINEAR LTC3880 User Guide
Summary
The LTC3880/-1 is a sophisticated dual-output DC/DC controller engineered for advanced digital power management in complex multi-rail electronic systems. This guide details how the unit simplifies design by integrating a comprehensive PMBus interface, enabling real-time monitoring and complete digital control of crucial power metrics like current and voltage. It is ideal for board designers developing high-performance electronics that require precise regulation, intelligent fault logging, and reliable system operation while minimizing design time and total cost.
Page 1 Text Content
January 2012 Volume 21 Number 4
Dual Output DC/DC Controller
integer-N synthesizer with integrated VCO in a 4mm × 5mm package 9 Combines Digital Power System
supercapacitor-based Management with Analog Control power supply ride-through system 15
Loop for ±0.5% VOUT Accuracy
ultralow-EMI, µModule Gregory Manlove regulator is EN55022 class B certified 20
Though power management is critical to the reliable operation of modern electronic systems, voltage regulators are perhaps the last
UMTS base station receiver
remaining “blind spot” in today’s digitally managed systems. Few
in half-inch square 23
regulators have the means for direct configuration or monitoring of key power system operating parameters. As a result, power
negative voltage diode-OR
controller tolerates inputs designers who want complete digital control must use a mixed bag
beyond 300V 30 of sequencers, microcontrollers and voltage supervisors to program
basic regulator start-up and safety functions. Digitally programmable DC/DC converters are available, most notably those with VID output
voltage control designed for VRM core power supplies, but these specifically targeted converters do not directly communicate important operating parameters, such as real-time currents. The LTC®3880/-1 solves the problem of complex power system management by combining a dual out- put synchronous step-down DC/DC controller with a comprehensive power management feature set accessed via the I2C-based PMBus. PMBus can be used to set the output voltage, margin voltages, switching
Caption frequency, sequencing and a number of other oper- The LTC3880 in a digitally managed power system. ating parameters (see “PMBus Control” below).
(continued on page 4)
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Page Summary Contents For LINEAR LTC3880 User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 6 |
| File Size | 3.61 MB |
| Published | June 16, 2026 |
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Frequently Asked Questions
Can the LTC3880 control multiple power rails' startup and safety functions?
The PMBus can be used to set output voltage, margin voltages, switching frequency, sequencing, and other operating parameters across various rails.