LT3433 High Voltage Step-Up/Step-Down DC/DC Converter

The LT®3433 is a 200kHz fixed-frequency current mode switching regulator that provides both step-up and stepdown regulation using a single inductor. The IC operates over a 4V to 60V input voltage range making it suitable for use in various wide input voltage range applications such as automotive electronics that must withstand both load dump and cold crank conditions.

Internal control circuitry monitors system conditions and converts from single switch buck operation to dual switch bridged operation when required, seamlessly changing between step-down and step-up voltage conversion.

Optional Burst Mode® operation reduces no-load quiescent current to 100µA and maintains high efficiencies with light loads.

Current limit foldback and frequency foldback help prevent inductor current runaway during start-up. Programmable soft-start helps prevent output overshoot at start-up.

The LT3433 is available in a 16-lead thermally enhanced TSSOP package

产品特点 Features

Automatic Step-Up and Step-Down Conversion
Uses a Single Inductor
Wide 4V to 60V Input Voltage Range
VOUT from 3.3V to 20V
Dual Internal 500mA Switches
100µA No-Load Quiescent Current
Low Current Shutdown
±1% Output Voltage Accuracy
200kHz Operating Frequency
Boosted Supply Pin to Saturate High Side Switch
Frequency Foldback Protection
Current Limit Foldback Protection
Current Limit Unaffected by Duty Cycle
16-lead Thermally Enhanced TSSOP Package

应用

12V Automotive Systems
Wall Adapter Powered Systems
Battery Power Voltage Buffering

典型应用图

参数

LT3433 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT3433EFE	TSSOP	16	E	$4.64	$3.25
LT3433EFE#PBF	TSSOP	16	E	$4.64	$3.25
LT3433EFE#TR	TSSOP	16	E		$3.37
LT3433EFE#TRPBF	TSSOP	16	E		$3.37
LT3433IFE	TSSOP	16	I	$5.36	$3.75
LT3433IFE#PBF	TSSOP	16	I	$5.36	$3.75
LT3433IFE#TR	TSSOP	16	I		$3.87
LT3433IFE#TRPBF	TSSOP	16	I		$3.87

LT3433 数据手册及相关资料下载

数据手册(英文) : LT3433 - High Voltage Step-Up/Step-Down DC/DC Converter.PDF
设计要点 (英文) : DN330 - High Input Voltage Monolithic Switcher Steps Up and Down Using a Single Inductor (Design Note 330A).PDF
设计要点 (中文) : DN330 - High Input Voltage Monolithic Switcher Steps Up and Down Using a Single Inductor (Design Note 330A).PDF
可靠性数据 : R468 Reliability Data .PDF