TLF50251EL数据手册集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF

描述 Description

The TLF50251EL is a high frequency PWM step-down DC/DC converter with an integrated PMOS power switch, packaged in a small PG-SSOP-14 with exposed pad. The wide input voltage range from 4.75 to 45 V makes the TLF50251EL suitable for a wide variety of applications. The device is designed to be used under harsh automotive environmental conditions. The switching frequency of nominal 2.2 MHz allows the use of small and cost-effective inductors and capacitors, resulting in a low, predictable output voltage ripple and in minimized consumption of board space. In light load condition the device operates in Pulse Frequency Modulation (PFM) to optimize the efficiency. Between the single pulses, all internal controlling circuitry is switched off to reduce the internal power consumption. The voltage regulation loop provides an excellent line and load regulation, the stability of the loop is ensured by an internal compensation network. This compensation network combined with a current mode regulation control guarantees a highly effective line transient rejection. During start-up the integrated soft-start limits the in rush current peak and prevents from an output voltage overshoot. The TLF50251EL includes protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. The enable function, in shutdown mode with less than 2 μA current consumption, enables easy power management in battery-powered systems. In addition, the TLF50251EL is providing a reset output with adjustable threshold to control the µC.

特性 Features

• 500 mA step down voltage regulator
• 5 V Output voltage
• ± 2% output voltage tolerance
• Low quiescent current (less than 45μA at nominal battery voltage)
• Current mode PWM regulation
• PFM mode for light load current
• Input voltage range from 4.75V to 45V
• Integrated power transistor
• 2.2 MHz switching frequency
• 100% Duty cycle
• Synchronization input
• Very low shutdown current consumption (<2 μA)
• Integrated compensation
• Integrated soft-start function
• Reset generator with adjustable threshold
• Input undervoltage lockout
• Suited for automotive applications: Tj = -40 °C to +150 °C
• Green Product (RoHS compliant)
• AEC Qualified
• Pin-compatible family approach

优势:
• Low current consumption for permanently Vbat-connnected systems
• High switching frequency reduces value and size of coil and output capacitor
• Low drop-out operation due to 100% DC
• No external components required for compensation and soft-start
• Flexibility in setting reset threshold
• One base design for multiple requirements by family approach

应用 Application

• Body
• Cluster
• Infotainment
• General purpose replacement of LDO

简介

TLF50251EL属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的TLF50251EL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。