LM5161QPWPRQ1 Texas Instruments MCU

LM5161QPWPRQ1 Overview

All trademarks are the property of their respective owners.

Description

The LM5161-Q1 is a 100-V, 1-A synchronous step-down converter with integrated high-sideand low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation andsupports high step-down ratios with fast transient response. An internal feedback amplifiermaintains ±1% output voltage regulation over the entire operating temperature range. The ON-timevaries inversely with input voltage resulting in nearly constant switching frequency. Peak andvalley current limit circuits protect against overload conditions. The under-voltage lockout(EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis.The FPWM input pin in LM5161-Q1 selects either the forced continuous conduction mode (CCM) underall load levels or the discontinuous conduction mode (DCM) under light or no load conditions. Whenoperating in forced CCM, the LM5161-Q1 supports the multiple output and isolated Fly-Buckapplications. When programmed for the DCM operation, the LM5161-Q1 provides a tightly regulatedbuck output without any additional external feedback ripple injection circuit.

Features

Qualified for Automotive Applications
AEC-Q100Qualified With the Following Results:
- Device Temperature Grade 1: –40°C to 125°C Ambient Operating TemperatureRange
- Device HBM ESD Classification Level 2
- Device CDM ESDClassification Level C5
Wide 4.5-V to 100-V InputVoltage Range
Integrated High-Side and Low-Side Switches
- No Schottky Diode Required
1-A Maximum Load Current
Constant ON-Time Control
- No External Loop Compensation
- Fast Transient Response
Selectable DCM Buck Operation at Light Load
CCM OptionSupports Multi-Output Fly-Buck?
No External Ripple circuit needed (at FPWM =0)
Nearly Constant Switching Frequency
Frequency Adjustable Up to 1 MHz
Programmable Soft-Start Time
Prebias Start-Up
Peak Current Limiting Protection
Adjustable Input UVLO and Hysteresis
±1% Feedback Voltage Reference
Thermal Shutdown Protection
Create a Custom Design Using the LM5161-Q1 With theWEBENCH? PowerDesigner