Summary of LTC3371 – 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset
The LTC3371 is a versatile multi-output power supply IC featuring four synchronous buck converters that utilize eight 1A power stages. It supports eight unique output configurations, allowing flexibility in current distribution from 1A to 4A per channel. The device offers independent input supplies for each DC/DC, precise enable thresholds for sequencing, and programmable switching frequencies ranging from 1MHz to 3MHz. Additional features include temperature monitoring, a watchdog timer, and reset pins indicating regulation status, all housed in compact QFN or TSSOP packages.
Parts used in the LTC3371 Project:
- Four synchronous buck converters
- Eight 1A power stages
- Pin programmable C1-C3 configuration pins
- External resistor for frequency programming
- External oscillator for PLL synchronization
- CT pin for timing parameters
- Independent RST pins
- Watchdog timer
- Temperature monitor
- 38-Lead 5mm × 7mm QFN package
- TSSOP package
Features
- 8 × 1A Buck Power Stages Configurable as 2, 3 or 4 Output Channels
- 8 Unique Output Configurations (1A to 4A Per Channel)
- Independent VIN Supplies for Each DC/DC (2.25V to 5.5V)
- Low Total No Load Supply Current:
- 15μA In Shutdown (All Channels Off)
- 68μA One Channel Active in Burst Mode® Operation
- 18μA Per Additional Channel
- Precision Enable Pin Thresholds for Autonomous Sequencing
- 1MHz to 3MHz RT Programmable Frequency (2MHz Default) or PLL Synchronization
- Temp Monitor Indicates Die Temperature
- CT Programmed Watchdog Timer
- Independent RST Pins Indicate Buck in Regulation
- Thermally Enhanced 38-Lead 5mm × 7mm QFN and TSSOP Packages
Description
The LTC®3371 is a highly flexible multioutput power supply IC. The device includes four synchronous buck converters, configured to share eight 1A power stages, each of which is powered from independent 2.25V to 5.5V inputs.
The DC/DCs are assigned to one of eight possible power configurations via pin programmable C1-C3 pins. The common buck switching frequency may be programmed with an external resistor, synchronized to an external oscillator, or set to a default internal 2MHz clock. The operating mode for all DC/DCs may be programmed for Burst Mode or forced continuous mode operation.
The CT pin programs the timing parameters of four independent RST pins as well as the watchdog timer.
To reduce input noise, the buck converters are phased in 90° steps. Precision enable pin thresholds facilitate reliable power sequencing. The LTC3371 is available in low profile 38-lead 5mm × 7mm QFN and TSSOP packages.
For More Details: LTC3371 – 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset
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What are the available output configurations for the LTC3371?
The device supports eight unique output configurations with current ranging from 1A to 4A per channel. -
How can the switching frequency be programmed?
The frequency can be set via an external resistor, synchronized to an external oscillator, or defaulted to an internal 2MHz clock. -
Can the operating mode be changed between Burst Mode and continuous mode?
Yes, the operating mode for all DC/DCs can be programmed for either Burst Mode or forced continuous mode operation. -
What voltage range do the independent VIN supplies support?
Each DC/DC has independent VIN supplies that operate within a range of 2.25V to 5.5V. -
How does the device reduce input noise?
The buck converters are phased in 90° steps to reduce input noise. -
What function does the CT pin serve?
The CT pin programs the timing parameters for four independent RST pins as well as the watchdog timer. -
Does the LTC3371 include a temperature monitoring feature?
Yes, a temp monitor indicates the die temperature of the device. -
What packages is the LTC3371 available in?
The device is available in low profile 38-lead 5mm × 7mm QFN and TSSOP packages.
