LM5161-Q1 Texas instruments

LM5161-Q1

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LM5161-Q1

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Описание

The LM5161-Q1 is a 100-V, 1-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley 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) under all load levels or the discontinuous conduction mode (DCM) under light or no load conditions. When operating in forced CCM, the LM5161-Q1 supports the multiple output and isolated Fly-Buck applications. When programmed for the DCM operation, the LM5161-Q1 provides a tightly regulated buck output without any additional external feedback ripple injection circuit.

Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
- Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C5
Wide 4.5-V to 100-V Input Voltage 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 Option Supports 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 the WEBENCH^® Power Designer

Device type	Converters
Topology	Buck
Vin (min) (V)	4.5
Vin (max) (V)	100
Vout (min) (V)	2
Vout (max) (V)	92
Iout (max) (A)	1
Features	Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification
Operating temperature range (°C)	-40 to 125
Regulated outputs (#)	1
Control mode	COT with emulated ripple, Constant on-time (COT)
Rating	Automotive