A8589中文资料Wide Input Voltage, 2.4 MHz, 2.5 A Asynchronous Buck Regulator With Low-IQ Standby, Sleep Mode, External Synchronization, and NPOR Output数据手册Allegro规格书

描述 Description

Designed to provide the power supply requirements of nextgeneration car audio and infotainment systems, the A8589provides all the control and protection circuitry to produce ahigh current regulator with ±1.0% output voltage accuracy. TheA8589 employs pulse frequency modulation (PFM) to drawless than 50 μA from 12 VIN while supplying 3.3 V/40 μA.After startup, the A8589 operates down to at least 3.6 VIN(VIN falling).

Features of the A8589 include a PWM/PFMn mode controlinput to enable PWM (logic high) or PFM (logic low). Ifthe PWM/PFMn input is driven by an external clock signalhigher than the base frequency ( fOSC) the PWM frequencysynchronizes to the incoming clock frequency. The SLEEPninput pin commands an ultra-low current shutdown moderequiring less than 5 μA for internal circuitry and 10 μA (max)for MOSFET leakage at 16 VIN, 85ºC. The A8589 has externalcompensation to accommodate a wide range of frequenciesand external components, and provides a power-on reset(NPOR) signal validated by the output voltage.

Extensive protection features of the A8589 include pulse-by-pulsecurrent limit, hiccup mode short circuit protection, open/shortasynchronous diode protection, BOOT open/short voltage protection,VIN undervoltage lockout, VOUT overvoltage protection and thermalshutdown.

The A8589 is supplied in a low profile 16-pin TSSOP packagewith exposed power pad (suffix LP). It is lead (Pb) free, with 100%matte-tin leadframe plating.

Applications

AutomotiveInstrument ClustersAudio SystemsNavigationHVACHome Audio

特性 Features

• Automotive AEC-Q100 qualified
• Withstands surge voltages up to 40 V
• Operates as low as 3.4 VIN (typ) with VIN decreasing
• Utilizes pulse frequency modulation (PFM) to draw only tens of microamperes from VIN while maintaining keep-alive VOUT
• PWM/PFMn mode control input pin
• Delivers up to 2.5 A of output current with integrated 110 mΩ high voltage MOSFET
• SLEEPn input pin commands ultra-low current shutdown mode
• Adjustable output voltage with ±1.0% accuracy from 0°C to 85°C, ±1.5% from –40°C to 150°C
• Programmable switching frequency: 250 kHz to 2.4 MHz
• Synchronization capability: applying a clock input to the PWM/PFMn input pin will increase the PWM frequency
• Active low, power-on reset (NPOR) open-drain output
• Maximized duty cycle for low dropout
• Pre-bias startup capable, VOUT will not cause a reset
• External compensation for maximum flexibility
• Stable with ceramic or electrolytic output capacitors
• Excellent set of protection features to satisfy the most demanding applications
• Overvoltage, pulse-by-pulse current limit, hiccup mode short circuit, and thermal protection
• Robust FMEA, with pin open/short and component faults
• Thermally enhanced, surface mount package

简介

A8589属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的A8589稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。