LM5117稳压电路 参数数据表

LM5117/Q1 Wide Input Range Synchronous Buck Controller with Analog Current Monitor (Rev. F)

SNVS698F – April2011 – revisedAugust 2015

PRODUCTION DATA.

LM5117 , LM5117-Q1

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1 Features

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LM5117-Q1 is Qualified for Automotive Applications AEC-Q100 Qualified With the Following Results:

Device Temperature Grade 1: -40°C to 125°C Ambient

Operating Temperature Range

Emulated Peak Current Mode Control Wide Operating Range from 5.5 V to 65 V Robust 3.3-A Peak Gate Drives

Adaptive Dead-Time Output Driver Control Free-Run or Synchronizable Clock up to 750 kHz Optional Diode Emulation Mode Programmable Output from 0.8 V Precision 1.5% Voltage Reference Analog Current Monitor Programmable Current Limit

Hiccup Mode Overcurrent Protection Programmable Soft-Start and Tracking

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Programmable Line Undervoltage Lockout

Programmable Switchover to External Bias Supply Thermal Shutdown

2 Applications

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Automotive Infotainment

Industrial DC-DC Motor Drivers Automotive USB Power Telecom Server

3 Description

The LM5117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control

utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

The operating frequency is programmable from 50 kHz to 750 kHz. The LM5117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM5117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency

synchronization, hiccup mode current limit, and adjustable line undervoltage lockout.

Device Information(1)

PART NUMBER LM5117 LM5117-Q1 PACKAGE BODY SIZE (NOM) HTSSOP (20) PWP 6.50 mm × 4.40 mm WQFN (24) RTW 4.00 mm × 4.00 mm 1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application