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Linear Technology Corporation introduces the LT3992, a monolithic, dual output, step-down switching regulator that delivers up to 3A of continuous output current per channel. Operating over an input voltage range of 3V to 60V, the LT3992 is ideal for load dump and cold cranking in automotive applications where continuous output voltage regulation is required. Each channel has independent input, shutdown, feedback, soft-start, current limit, and comparator pins, simplifying complex power tracking/sequencing requirements. With a switching frequency range of 250kHz to 2.25MHz, the LT3992 is user-programmable, allowing designers to optimize efficiency while avoiding critical noise-sensitive frequency bands.

To optimize efficiency and component size, both internal converters have programmable maximum current limits and can be synchronized by the LT3992's internal oscillator or an external clock input. The two converters operate with 180° inversion to further reduce voltage ripple and external component size. Multiple regulators can be synchronized by an external clock output to provide additional voltage rails. For high current applications, the outputs can also be combined to allow the LT3992 to deliver up to 6A of continuous output current. Housed in a 5mm x 5mm QFN-32 package or thermally enhanced TSSOP-38 package, the device's high switching frequency maintains a small footprint of external capacitors and inductors, resulting in a compact footprint and high thermal efficiency solution. Program. The LT3992's main switch features a high efficiency 3.5A, 325mV CESAT switch that integrates the necessary oscillator, control and logic circuitry in a single chip.

Thanks to a special design approach, high efficiency is achieved over a wide input voltage range, and the device's current mode topology provides fast transient response and excellent loop stability. The LT3992 provides a divider on one channel, allowing the device to operate at a frequency equal to 1/2, 1/4, or 1/8 of the other channel's frequency, which provides a high step-down ratio while still providing Minimize the size of external components. Enhanced short circuit protection and a chip temperature monitor provide additional protection. Other features include thermal shutdown and independent power good marking.

The LT3992EUH is available in a 5mm x 5mm 32-lead QFN package, while the LT3992EFE is available in a thermally enhanced FMEA fault tolerant TSSOP-38 package. The high temperature version of the LT3992HFE has also been tested to ensure a working junction temperature range of -40 ° C to 150 ° C.

Performance Summary: LT3992

• Wide input range: operates from 3V to 60V
• Each 3A regulator has separate power, shutdown, soft-start, UVLO, programmable current limit, and programmable power good flags
• Chip temperature monitor
• Adjustable / synchronizable fixed frequency with synchronous clock output operates from 250kHz to 2.25MHz
• Independent synchronous switching frequency optimizes component size
• Inverting switch
• Output can be connected in parallel
• Flexible output voltage tracking
• Low dropout: maximum duty cycle is 95%
• 5mm x 5mm QFN package
• FMEA Compliant 38-Pin Exposed Pad TSSOP Package

application

• Car power supply
• Distributed power regulation
  

LT3992 application circuit