LM5143 Dual Synchronous Buck Controller

Specifications

Product Overview

The LM5143 is a Texas Instruments dual synchronous buck controller for Power_Management designs using two interleaved synchronous buck channels. It operates from a 3.5 V to 65 V input range and can regulate fixed 3.3 V, fixed 5 V, or adjustable outputs from 0.6 V to 55 V. The controller supports dual-output operation or single-output multiphase operation using interleaved, stackable, peak current-mode control.

Its timing and frequency features support high conversion-ratio and low-dropout designs. The device specifies 65 ns minimum on time for high VIN/VOUT ratios, 60 ns minimum off time for low-dropout operation, a resistor-adjustable 100 kHz to 2.2 MHz switching range, and synchronization to an external clock up to 2.5 MHz.

The package is a 40-pin VQFN RHA, 6.00 mm x 6.00 mm, with orderable part number LM5143RHAR and package drawing RHA. Design features include shunt resistor or inductor DCR current sensing, 20 uA soft-start current sources, hiccup-mode overcurrent protection, thermal shutdown with hysteresis and automatic recovery, 180-degree phase shift between outputs, and a 90-degree out-of-phase SYNCOUT for cascaded or multiphase power stages.

Key Features

• 3.5 V to 65 V operating input range
• Two interleaved synchronous buck channels
• Fixed 3.3 V, fixed 5 V, or adjustable outputs
• 0.6 V to 55 V adjustable output range
• 100 kHz to 2.2 MHz resistor-adjustable switching frequency
• External synchronization up to 2.5 MHz
• 65 ns minimum on time for high conversion ratios
• 60 ns minimum off time for low-dropout operation
• Shunt resistor or inductor DCR current sensing
• Hiccup-mode overcurrent protection after current-limit cycling
• Slew-rate controlled gate drivers and spread spectrum
• Thermal shutdown with hysteresis and automatic recovery

Typical Applications

• Dual-output buck regulator designs
• Single-output multiphase buck converters
• Cascaded multichannel power stages
• High VIN/VOUT ratio supplies
• Low-dropout buck operation
• EMI-constrained power systems
• Synchronized power converter systems

Procurement Notes

When requesting a quote for LM5143, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.

If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.

For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.