描述 Description

The NCV8856A is an adjustable output, synchronous buck controller, which drives dual N?channel MOSFETs - ideal for highpower applications. Average current mode control is employed for very fast transient response and tight regulation over wide input voltage and output load ranges. An internal fixed 6.0 V low?dropout linear regulator (LDO) supplies charge to the switch mode power supply’s (SMPS) top and bottom gate drivers, limiting the power lost to excess gate drive. The IC is designed for operation over an input voltage range of 4.5 V to 38 V and is capable of 10 to 1 voltage conversion at 500 kHz.

特性 Features

? Average Current Mode
? Fast Transient Response and Tight Regulation.
? 0.8 V Reference Voltage
? Output adjustable down to 0.8 V.
? +/-2% Output Voltage Accuracy over temperature
? Consistent operation over temperature
? 4.5 V to 38 V Input Range
? Serves a wide range of applications. Operates through Load Dump.
? Input Undervoltage Lockout
? Reliably off when input voltage is too low for safe operation.
? Low Quiescent Current in Sleep Mode
? Extremely Low battery drain when not active.
? Internally controlled soft-start
? Reduced input surge current at startup. No output overshoot at startup.
? Programmable Switching Frequency up to 500kHz
? Increased design flexibility.
? Switching Frequency can be Synchronized up to 600kHz
? Flexibility for optimized Electromagnetic Compatibility.
? Average Output Current Limiting
? Output overload protection is independent of input and output voltage.
? Peak Output Current Limiting
? Prevents inductor saturation during overload.
? 6.0 V Low-dropout Linear Regulator Auxiliary Output
? Regulated voltage available as a low current reference voltage.
? -40 °C to 150 °C Operating Junction Temperature
? Useful for a wide variety of applications.
? Thermal Shutdown Protection
? Shuts off the converter at unsafe temperatures.

應用 Application

? Automotive Systems Requiring a High Current Power Supply.
? Pre-regulated Supply for Low-voltage SMPSs and LDOs.
? Radio and Infotainment
? Instrumentation and Clusters
? Telematics
? Body Electronics
? Navigation
? Automotive

簡介

NCV8856A屬于集成電路（IC）的線性穩(wěn)壓器控制器。由制造生產(chǎn)的NCV8856A穩(wěn)壓器 - 線性 + 開關此產(chǎn)品族中的產(chǎn)品用于構建執(zhí)行 DC-DC 轉(zhuǎn)換或電壓調(diào)節(jié)功能的電路，采用的是開關模式和線性穩(wěn)壓器功能的組合。雖然具體的拓撲各不相同，但此類產(chǎn)品的主要目的是將開關模式技術的效率優(yōu)勢與線性穩(wěn)壓技術的低噪聲特性結合在一起。