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LM5145 Datasheet(PDF) 1 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 67 page  BST HO SW VCC PGND RT SS/TRK COMP FB AGND VIN VOUT LM5145 VOUT SYNC In GND PG SYNCOUT SYNCIN EN/UVLO VIN ILIM PGOOD SYNC Out LO LF COUT Q1 Q2 CIN RILIM CVCC CBST CSS RFB2 RFB1 RC2 CC2 CC1 RC1 CC3 RRT EN VIN Product Folder Order Now Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM5145 SNVSAI4 – JUNE 2017 LM5145 6-V to 75-V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range 1 1 Features 1 • 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 Power Good 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 WEBENCH® Power Designer 2 Applications • Remote Radio Unit (RRU) and BTS • Networking and Computing Power • Non-Isolated PoE and IP Cameras • Industrial Motor Drives 3 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. Forced-PWM (FPWM) operation eliminates frequency variation to minimize EMI, while a user-selectable diode emulation feature lowers current consumption at light-load conditions. Cycle-by-cycle overcurrent protection is accomplished by measuring the voltage drop across the low-side MOSFET or by using an optional current sense resistor. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM5145 VQFN (20) 3.50 mm × 4.50 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit and Efficiency Performance, VOUT = 5 V |
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