LM5145 Synchronous Buck DC/DC Controller

Specifications

Product Overview

The LM5145 is a Texas Instruments synchronous buck DC/DC controller for Power_Management designs requiring wide input operation. Its operating input range is 6 V to 75 V, and the output voltage is adjustable from 0.8 V to 60 V using the feedback divider. The controller uses a 0.8 V feedback reference with ±1% feedback regulation accuracy.

The device uses voltage-mode control with line feedforward for line and load transient response. Switching frequency is adjustable from 100 kHz to 1 MHz, with 1 MHz listed as the recommended maximum oscillator frequency for RT-pin programming. Timing capabilities include 40 ns minimum high-side on-time and 140 ns minimum off-time, supporting high VIN/VOUT ratio operation and low dropout operation.

Gate-drive functions include 7.5 V high-side and low-side drivers for standard-threshold MOSFETs, 2.3 A source current, 3.5 A sink current, and 14 ns adaptive dead-time. The 20-pin VQFN (RGY) package has wettable flanks and a 4.50 mm x 3.50 mm body.

Control and protection functions include selectable forced-PWM or diode emulation, SYNC input and 180-degree out-of-phase SYNC output, open-drain PGOOD, EN/UVLO thresholds, soft-start tracking, valley current limiting, and cycle-by-cycle plus hiccup-mode overcurrent protection.

Key Features

• 6 V to 75 V operating input range
• 0.8 V to 60 V adjustable output voltage
• 0.8 V reference with ±1% feedback accuracy
• 100 kHz to 1 MHz adjustable switching frequency
• 40 ns minimum high-side on-time
• 140 ns minimum off-time for low dropout operation
• 7.5 V MOSFET gate drivers
• 2.3 A source and 3.5 A sink gate drive
• Forced-PWM or diode emulation switching modes
• SYNC input with 180-degree out-of-phase SYNC output
• Open-drain power-good output
• Cycle-by-cycle and hiccup-mode overcurrent protection

Typical Applications

• Wide-input synchronous buck converters
• Adjustable-output DC/DC power rails
• Externally synchronized power converters
• Interleaved controller power stages
• Low dropout buck operation
• Power-good monitored supply rails
• Forced-PWM regulated power rails
• Diode-emulation light-load converters

Procurement Notes

When requesting a quote for LM5145, 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.