IC manufacturers Texas Instruments

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Texas Instruments LM5145

LM5145 6-V to 75-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range

Overview

TopologyBuck Converter
Input voltage28-75 V
Switching frequency100-1000 kHz
Output 124 V / 5 A
IC revisionA

Description

The LM5145 75-V synchronous buck controller is designed to regulate from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns facilitates large step-down ratios, enabling the direct step-down conversion from 48 V to low-voltage rails for reduced system complexity and solution cost. The LM5145 continues to operate at nearly 100% duty cycle during input voltage dips as low as 6 V, making it well suited for high-performance industrial control, robotic, datacom and RF power amplifier applications.

Features

Versatile Synchronous Buck DC-DC Controller– Wide Input Voltage Range of 6 V to 75 V– Adjustable Output Voltage From 0.8 V to 60 V

  • Meets EN55022 / CISPR 22 EMI Standards
  • Lossless RDS(on) or Shunt Current Sensing
  • Switching Frequency From 100 kHz to 1 MHz– SYNC In and SYNC Out Capability
  • 40-ns Minimum On-Time for High VIN / VOUT Ratio
  • 140-ns Minimum Off-Time for Low Dropout
  • 0.8-V Reference With ±1% Feedback Accuracy
  • 7.5-V Gate Drivers for Standard VTH MOSFETs– 14-ns Adaptive Dead-Time Control– 2.3-A Source and 3.5-A Sink Capability– Low-Side Soft-Start for Prebiased Start-Up
  • Adjustable Soft-Start or Optional Voltage Tracking
  • Fast Line and Load Transient Response– Voltage-Mode Control With Line Feedforward– High Gain-Bandwidth Error Amplifier
  • Precision Enable Input and Open-Drain PowerGood Indicator for Sequencing and Control
  • Inherent Protection Features for Robust Design– Hiccup Mode Overcurrent Protection– Input UVLO With Hysteresis– VCC and Gate Drive UVLO Protection– Thermal Shutdown Protection With Hysteresis
  • VQFN-20 Package With Wettable Flanks
  • Create a Custom Design Using the LM5145 With

Typical applications

  • Industrial Motor Drives
  • Remote Radio Unit (RRU) and BTS,Networking and Computing Power
  • Non-Isolated PoE and IP Cameras

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
Mount Samples
744373965150SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-LHMI SMT Power Inductor 15 7.7 10.2 18.5 28 7.5 SMT
Order Code Data­sheet Simu­lation
744373965150SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
Mount Samples