LTC3889
RECOMMENDED FOR NEW DESIGNS60V Dual Output Step-Down Controller with Digital Power System Management
- Part Models
- 6
- 1ku List Price
- Starting From $11.37
Overview
- PMBus/I2C Compliant Serial Interface
- Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and Faults
- Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV/OC, Frequency, and Control Loop Compensation
- Output Error Less Than ±0.5% Over Temperature
- Integrated 16-Bit ADC and 12-Bit DAC
- Integrated High Side Current Sense Amplifier
- Internal EEPROM with ECC and Fault Logging
- Integrated N-Channel MOSFET Gate Drivers
- Wide VIN Range: 5V to 60V
- VOUT0, VOUT1 Range: 1V to 40V
- Analog Current Mode Control
- Accurate PolyPhase® Current Sharing for Up to 6 Phases (85kHz to 500kHz)
- Available in a 52-Lead (7mm× 8mm) QFN Package
The LTC3889 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller with I2C-based PMBus compliant serial interface. This controller employs a constant-frequency, current-mode architecture, with high voltage input and output capability along with programmable loop compensation. The LTC3889 is supported by the LTpowerPlay™ software development tool with graphical user interface (GUI).
The EXTVCC pin supports voltages up to 14V allowing for optimized circuit efficiency and die temperature, and for the controller output to supply the chip power. Switching frequency, output voltage, and device address can be programmed both by digital interface as well as external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Both outputs have an independent power good indicator and FAULT function.
The LTC3889 can be configured for discontinuous (pulse-skipping) mode or continuous inductor current mode.
APPLICATIONS
- Telecom, Datacom, and Storage Systems
- Industrial and Point of Load Applications
Documentation
Data Sheet 1
Device Drivers 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3889EUKG#PBF | 52-Lead Plastic QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC3889EUKG#QN75-1PBF | 52-Lead Plastic QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC3889EUKG#QN76-1PBF | 52-Lead Plastic QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC3889EUKG#TRPBF | 52-Lead Plastic QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC3889IUKG#PBF | 52-Lead Plastic QFN (7mm x 8mm x 0.75mm w/ EP) | ||
| LTC3889IUKG#TRPBF | 52-Lead Plastic QFN (7mm x 8mm x 0.75mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3889
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3889
LTpowerPlay®
LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.
Open ToolLTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3889EUKG 60V Dual Output Step-Down DC/DC Controller with Digital Power System Management