Summary of Buck converter starts up in just 70 ms
The LTC3887 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller featuring a PMBus/I2C interface for precise control and telemetry. It supports programmable voltage, current limits, and sequencing with high accuracy. The device includes integrated gate drivers, an ADC, and EEPROM for fault logging, operating within a wide input voltage range.
Parts used in the LTC3887 Project:
- Dual PolyPhase DC/DC synchronous step-down switching regulator controllers
- PMBus/I2C compliant serial interface
- Integrated 16-Bit ADC
- Internal EEPROM
- N-Channel MOSFET Gate Drivers
- External configuration resistors
- LTpowerPlay software development tool
- 40-Pin (6mm × 6mm) QFN Package
Features
- Order Custom Programmed Parts
- PMBus/I2C Compliant Serial Interface
- – Telemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature, Duty Cycle and Faults
- – Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)
- ±0.5% Output Voltage Accuracy Over Temperature
- Integrated 16-Bit ADC
- VOUT Range: 0.5V to 5.5V (VOUT0, VOUT1)
- Internal EEPROM and Fault Logging
- Integrated Powerful N-Channel MOSFET Gate Drivers
- Wide VIN Range: 4.5V to 24V
- Analog Current Mode Control Loop
- Remote Differential Sense for PolyPhase® Applications
- Accurate PolyPhase Current Sharing for Up to Six Phases
- Available in a 40-Pin (6mm × 6mm) QFN Package
Description
The LTC®3887 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2Cbased PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay™ a software development tool with graphical user interface (GUI).
Switching frequency, channel phasing, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface.
The LTC3887 can be configured for discontinuous (pulseskipping) mode or continuous inductor current mode. The LTC3887 has integrated gate drivers. The LTC3887 is an enhanced version of the LTC3880 with greater output voltage range and more digital features. Refer to page 15 for more detail.
For More Detail : Buck converter starts up in just 70 ms
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What type of interface does the LTC3887 use?
The LTC3887 uses a PMBus/I2C compliant serial interface. -
Can the switching frequency be programmed?
Yes, parameters including switching frequency can be set via the digital interface or stored in EEPROM. -
What telemetry data can be read back through the bus?
VIN, IIN, VOUT, IOUT, Temperature, Duty Cycle, and Faults can be read back. -
How many phases can the device support for current sharing?
The device provides accurate PolyPhase current sharing for up to six phases. -
What software tool supports this device?
LTpowerPlay is the software development tool with a graphical user interface that supports the device. -
Does the LTC3887 have integrated gate drivers?
Yes, the LTC3887 has integrated powerful N-Channel MOSFET gate drivers. -
What is the output voltage range of the device?
The VOUT range is from 0.5V to 5.5V. -
How fast does the buck converter start up?
The buck converter starts up in just 70 ms.
