LM25149集成電路（IC）的DC-DC開(kāi)關(guān)控制器規(guī)格書(shū)PDF中文資料

LM25149屬于集成電路（IC）的DC-DC開(kāi)關(guān)控制器。由德州儀器制造生產(chǎn)的LM25149DC-DC 開(kāi)關(guān)控制器PMIC（電源管理集成電路）DC 到 DC 開(kāi)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(xiàn)性穩(wěn)壓器。

1 Features

? – Device temperature grade 1: –40°C to +125°C

ambient temperature range

? Versatile synchronous buck DC/DC controller

– 6-V to 95-V wide input voltage range

– 125°C maximum junction temperature

– 0.8-V reference with ±1 feedback accuracy

– 0.8-V to 60-V adjustable output voltage

– 45-ns tON(min) for high VIN / VOUT ratio

– 145-ns tOFF(min) for low dropout

– Lossless RDS(on) or shunt current sensing

– Optimized for CISPR 11 and CISPR 32 Class B

EMI requirements

? 100-kHz to 1-MHz switching frequency

– SYNC in and SYNC out capability

– Selectable diode emulation or FPWM

? 7.5-V gate drivers for standard VTH MOSFETs

– 14-ns adaptive dead-time control

– 2.3-A source and 3.5-A sink capability

? Inherent protection features for robust design

– Adjustable output voltage soft start

– Hiccup-mode overcurrent protection

– Input UVLO with hysteresis

– VCC and gate-drive UVLO protection

– Precision enable input and open-drain PGOOD

indicator for sequencing and control

– Thermal shutdown protection with hysteresis

? 20-pin VQFN package with wettable flanks

2 Applications

? Wireless infrastructure, cloud computing

? Industrial motor drives, test and measurement

? Personal transport vehicle: electric bike

? Asset tracking and fleet management systems

? Non-isolated PoE, IP cameras

? Inverting buck-boost regulators

3 Description

The LV5144 95-V, synchronous, buck controller

regulates from a high input voltage source or from an

input rail subject to high-voltage transients, minimizing

the need for external surge suppression components.

A high-side switch minimum on-time of 45 ns gives

large step-down ratios, enabling the direct step-down

conversion from a 48-V nominal input to low-voltage

rails for reduced system complexity and design

cost. The LV5144 continues to operate during input

voltage dips as low as 6 V, at nearly 100 duty

cycle if needed, making an excellent choice for highperformance

industrial controls, robotics, datacom,

and RF applications.

Forced-PWM (FPWM) operation eliminates switching

frequency variation to minimize EMI, while

user-selectable diode emulation lowers current

consumption at light-load conditions. The adjustable

switching frequency as high as 1 MHz can be

synchronized to an external clock source to eliminate

beat frequencies in noise-sensitive applications.