描述 Description

The TLF51801ELV is a PWM step-down DC/DC controller with external power switches, packaged in a small, thermal enhanced PG-SSOP-14 with exposed pad. The regulator is capable to drive external power-stages (n/n-MOS) for loads up to 10 A. The current limitation function is using either the Rdson of the HS-switch or a external shunt resistor. The output voltage with a 2% tolerance is adjustable. The device can run with a duty cycle larger than 99%. The bootstrap diode is integrated to save external components. The switching frequency can be set between 100 kHz and 700 kHz or can be synchronized to an external clock. During start-up the integrated soft-start limits the in rush current peak and prevents from an output voltage overshoot. The enable function, in shutdown mode with less than 2 μA current consumption, enables easy power management in battery-powered systems. The TLF51801ELV includes protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. With a temperature range Tj from -40°C to 150°C the device is suitable for harsh environment of automotive applications

特性 Features

? Controller for loads up to 10A
? Driving external power-stage (n/n-MOS)
? Current limitation using the Rdson of the HS-switch or via shunt-resistor
? Adjustable output voltage: 1.2V up to Dmax*Vs
? ± 2% output voltage tolerance
? Duty cycle > 99%
? Integrated bootstrap diode
? Input voltage range from 4.75V to 45V
? Adjustable switching frequency: 100 kHz up to 700 kHz
? Syncronization input
? EN for ultra-low shut-down current (< 2 μA)
? Integrated soft-start function
? Suited for automotive applications: Tj = -40 °C to +150 °C
? Green Product (RoHS compliant)
? AEC Qualified

優(yōu)勢:
? Rdson-current limitation saves external shunt resisitor and board space
? Integrated bootstrap diode saves external components and board space
? High duty cycle allows low drop-out operation
? Integrated soft- start function saves external components and board space

應(yīng)用 Application

? General purpose
? Pre-regulator

簡介

TLF51801ELV屬于集成電路（IC）的PMIC-穩(wěn)壓器-DCDC開關(guān)式控制器。由制造生產(chǎn)的TLF51801ELVDC-DC 開關(guān)控制器PMIC（電源管理集成電路）DC 到 DC 開關(guān)式控制器是用于高效率電路的穩(wěn)壓 IC，其配置為生成高于（突升或步升）或低于（突降或步降）輸入電源的輸出電源電壓。其他拓?fù)浣Y(jié)構(gòu)可能包括：降壓-升壓、反激、正激、Cuk、SEPIC、全橋、半橋和推挽式。這些器件不同于需要最小電壓并“燒盡”多余電壓的線性穩(wěn)壓器。