## RH5RH552B-T2: Electronic Component Overview The **RH5RH552B-T2** is a specialized voltage regulator integrated circuit (IC) primarily manufactured by **Nisshinbo Micro Devices** (formerly Ricoh Electronic Devices). It belongs to the RH5RH series, which are CMOS-based PWM step-up DC/DC converters. ### 1. Technical Specifications The following table summarizes the key technical parameters for this specific part number: | Parameter | Specification | | :--- | :--- | | **Device Type** | Step-Up (Boost) DC/DC Converter | | **Output Voltage** | 5.5V (Fixed) | | **Output Voltage Accuracy** | ±2.5% | | **Input Voltage Range** | 0.9V to 10V (approximate) | | **Switching Frequency** | 100 kHz (Typ.) | | **Package Type** | SOT-89-5 | | **Control Method** | PWM (Pulse Width Modulation) | --- ### 2. Part Number Breakdown The nomenclature reveals specific characteristics of the component: * **RH5RH**: Series name for CMOS step-up DC/DC converters. * **55**: Indicates the output voltage (5.5V). * **2**: Designates the internal oscillator frequency or version. * **B**: Internal classification for specific features (like the presence of a Power-Good signal or Enable function). * **T1/T2**: Tape and Reel packaging orientation/specifications. --- ### 3. Functional Features This component is designed for high efficiency and minimal external part counts. Key features include: * **Low Start-up Voltage:** Capable of starting with as little as 0.9V, making it ideal for single-cell battery applications. * **Internal Power MOSFET:** Includes a built-in switching transistor, reducing the need for external power components. * **High Efficiency:** Typically achieves 80% to 85% efficiency depending on the load. * **Minimal External Components:** Generally requires only an inductor, a diode, and a capacitor to function. ### 4. Typical Applications The RH5RH552B-T2 is commonly found in portable, battery-powered electronics: 1. **Handheld Devices:** PDAs, portable medical equipment. 2. **Battery Boosters:** Converting 1.5V or 3V battery outputs to a stable 5.5V rail. 3. **Local Power Supply:** Generating specific voltage rails on complex PCBs where only a low-voltage main supply is available. --- ### 5. Application Circuit Example A basic implementation follows this logic: ```markdown Input Vin -> Inductor -> [LX Pin] -> Diode -> Output Vout | [RH5RH552B] | Ground ```