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Manufacturer: TOREX

Part Number: XC6382A401MR

Specifications:

• Output Voltage: 4.0V (Fixed)
• Output Current: 150mA (Max)
• Input Voltage Range: 1.8V to 6.0V
• Quiescent Current: 1.0µA (Typ)
• Dropout Voltage: 150mV (Typ) @ 100mA
• Accuracy: ±1.5% (VOUT ≥ 2.0V)
• Oscillator Frequency: 1.2MHz (Typ)
• Package: SOT-25 (5-pin)
• Operating Temperature Range: -40°C to +85°C

Descriptions:

The XC6382A401MR is a low-power, high-efficiency step-up DC/DC converter with a fixed output voltage of 4.0V. It features ultra-low quiescent current, making it suitable for battery-powered applications. The device integrates a synchronous rectifier for improved efficiency and includes built-in protection features such as overcurrent and thermal shutdown.

Features:

• Ultra-low quiescent current (1.0µA Typ)
• High efficiency (up to 90%)
• Synchronous rectification
• Built-in soft-start function
• Overcurrent protection (OCP)
• Thermal shutdown protection (TSD)
• Small SOT-25 package for space-constrained designs

This IC is ideal for portable devices, IoT applications, and other battery-powered systems requiring stable voltage regulation.

# XC6382A401MR: Application Scenarios, Design Pitfalls, and Implementation Considerations

## 1. Practical Application Scenarios

The XC6382A401MR from TOREX is a high-efficiency, step-up DC/DC converter with a built-in MOSFET, designed for low-power applications requiring stable voltage regulation. Below are key scenarios where this IC excels:

1.1 Battery-Powered Devices

Due to its low quiescent current (typically 1.0 µA) and high efficiency (up to 90%), the XC6382A401MR is ideal for battery-operated devices such as:

• Wearable electronics (smartwatches, fitness trackers)
• IoT sensors (wireless sensor nodes, environmental monitors)
• Portable medical devices (glucose meters, hearing aids)

Its ability to operate from input voltages as low as 0.9V makes it suitable for single-cell alkaline or coin-cell battery applications.

1.2 Energy Harvesting Systems

The converter’s low start-up voltage (0.9V) and high efficiency enable integration into energy-harvesting setups, such as:

• Solar-powered sensors
• Piezoelectric or RF energy harvesters

1.3 Consumer Electronics

The XC6382A401MR is used in compact consumer devices requiring stable power from variable sources, including:

• Bluetooth peripherals (earbuds, keyboards)
• Handheld gadgets (digital thermometers, LED flashlights)

## 2. Common Design-Phase Pitfalls and Avoidance Strategies

2.1 Input Voltage Instability

Pitfall: If the input voltage drops below the minimum operating threshold (0.9V), the converter may fail to start or exhibit unstable output.

Solution:

• Ensure the power source (e.g., battery) maintains sufficient voltage under load.
• Implement a bulk capacitor (1–10 µF) near the input pin to mitigate voltage dips.

2.2 Poor PCB Layout

Pitfall: High switching frequency (1.2 MHz) can introduce noise or voltage ripple if traces are improperly routed.

Solution:

• Keep input/output traces short and wide.
• Place the inductor close to the IC and use a ground plane for noise reduction.

2.3 Overloading the Output

Pitfall: Exceeding the 200mA output current limit causes voltage droop or thermal shutdown.

Solution:

• Verify load requirements and derate the IC if sustained high current is needed.
• Add a current-limiting circuit if the load is unpredictable.

## 3. Key Technical Considerations for Implementation

3.1 Component Selection

• Inductor: Use a 4.7 µH shielded inductor (low DCR recommended) to minimize losses.
• Output Capacitor: A 10 µF ceramic capacitor (X5R/X7R) ensures stability and low ESR.

3.2 Thermal Management

While the XC6382A401MR includes thermal shutdown, prolonged high-load operation may require:

• Adequate copper pour for heat dissipation.
• Avoiding placement near