Texas Instruments LM5143

Description

The LM5143 is a 65-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, the device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on time of 65 ns provides large step-down ratios, enabling the direct conversion from 12-V, 24-V, or 48-V inputs to low-voltage rails for reduced system complexity and cost. The LM5143 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM5143 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

Features

• Functional Safety-Capable
• Documentation available to aid functional safety system design
• Versatile synchronous buck DC/DC controller
• Wide input voltage range of 3.5 V to 65 V
• 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 55 V
• 150°C maximum junction temperature
• 4-µA typical shutdown mode current
• 15-µA typical no-load standby current
• Two interleaved synchronous buck channels
• Dual channel or single-output multiphase
• 65-ns tON(min) for high VIN/VOUT ratio
• 60-ns tOFF(min) for low dropout
• Inherent protection features for robust design
• Shunt or inductor DCR current sensing
• Hiccup mode overcurrent protection
• Independent ENABLE and PGOOD functions
• Adjustable output voltage soft start
• VCC, VDDA, and gate-drive UVLO protection
• Thermal shutdown protection with hysteresis
• Optimized for CISPR 11 and CISPR 32 class B conducted and radiatedEMI requirements
• Slew-rate controlled adaptive gate drivers
• Spread spectrum reduces peak emissions
• 100-kHz to 2.2-MHz switching frequency
• SYNC in and SYNC out capability
• Selectable diode emulation or FPWM modes
• 6-mm × 6-mm VQFN-40 package
• Create a custom design using the LM5143 with WEBENCH Power Designer

Typical applications

• Enterprise systems: high-performance computing
• Industrial: factory automation and control, robotics
• Communications systems: wireless infrastructure, remote radio unit (RRU)

More information

• Datasheet
• IC product information