R1224中文资料18.5V输入PWM/VFM降压DC/DC控制器数据手册Nisshinbo规格书

描述 Description

The R1224 Series are low supply current CMOS-based PWM/VFM step-down DC/DC controller with an external output transistor. By simply using a power transistor, an inductor, a diode, and a capacitor as external components, a high-efficiency step-down DC/DC converter can be easily configured. The PWM/VFM alternative circuit automatically switches to VFM control in the smaller output current range and provides high efficiency even in the smaller output current range. The version with fixed PWM control and adjustable output voltage with an external resistor is also available.

The reset type protection circuit embedded into the device limits output current by repeatedly triggering the soft start circuit when the oscillator maximum duty cycle continues for a predetermined period of time. When the oscillator maximum duty cycle ends, normal operation is resumed automatically. R1224 also includes an under-voltage lockout circuit (UVLO) that stops DC/DC operation and prevents malfunction when the supply voltage falls below the UVLO detect voltage and reduces supply current.

特性 Features

• Input Voltage Range (Maximum Rating)：2.3 V to 18.5 V (20.0 V)；
• Supply Current：Typ. 20 µA (R1224Nxx2E/F/M/L, R1224N102M),Typ. 30 µA (R1224Nxx2G, R1224N102G),Typ. 40 µA (R1224Nxx2H, R1224N102H)；
• Standby Current：Typ. 0 µA；
• Output Voltage Range：1.2 V to 6.0 V (0.1 V steps; R1224Nxx2x),1.0 V to VIN (R1224N102x)；
• Output Voltage Accuracy：±2.0%；
• Oscillator Frequency：Typ. 180 kHz (R1224Nxx2L/M, R1224N102M),Typ. 300 kHz (R1224Nxx2E/G, R1224N102G),Typ. 500 kHz (R1224Nxx2F/H, R1224N102H)；
• Efficiency：Typ. 90%；
• Reset Protection Circuit：Typ. 15 ms；
• Temperature-Drift Coefficient of Output Voltage：Typ. ±100 ppm/°C；
• Package：SOT-23-5；
• Soft Start Time：Typ. 10 ms；
• Protection Function：Built-in Current Limit Circuit；

应用 Application

• Power source for hand-held communication equipment, cameras, video instruments such as VCRs, camcorders
• Power source for battery-powered equipment
• Power source for household electrical appliances

简介

R1224属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由制造生产的R1224DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。