XHSC-Buck-5V3A
High-efficiency 3A synchronous buck converter with 4.5V-18V input, adjustable output, 95% peak efficiency for industr...
Product Overview
Description
The XHSC-Buck-5V3A is a high-efficiency synchronous buck converter capable of delivering up to 3A continuous output current.
With a wide input voltage range of 4.5V to 18V and adjustable output voltage from 0.8V to 15V, this converter suits various industrial and automotive applications.
Peak efficiency of 95% at 5V output reduces thermal dissipation and enables compact designs without heat sinks.
Product Series
XHSC
Primary Application
Industrial control systems
Key Features
- High-efficiency synchronous rectification up to 95%
- Wide input voltage range 4.5V to 18V
- Adjustable output voltage with external resistors
- 3A continuous output current capability
- Internal compensation for simplified design
- Power-good indicator for sequencing
- Soft-start to limit inrush current
- AEC-Q100 qualified for automotive
Specifications
| Topology | Synchronous Buck |
|---|---|
| Input Voltage | 4.5V to 18V |
| Output Voltage | 0.8V to 15V (Adjustable) |
| Output Current | 3A Continuous |
| Peak Efficiency | 95% at 5Vout |
| Switching Frequency | 500kHz Fixed |
| Quiescent Current | 2mA (Active) |
| Shutdown Current | 1μA |
| Protection | OCP, OVP, UVLO, Thermal |
| Operating Temperature | -40°C to +125°C |
| Package | SOP-8, TSSOP-16 |
Applications
Industrial control systems
Industrial automation and control
Automotive electronics
Automotive and EV electronics
Distributed power systems
Electronic system design
Battery-powered equipment
Battery and charging management
Telecom and networking
Communication and interface
LED drivers
Motor drive and control systems
FAE Expert Insights
"The XHSC-Buck-5V3A is my top recommendation for industrial power supply designs. I've used this converter in numerous projects and consistently achieve 93-95% efficiency at typical loads. The internal compensation really simplifies the design - you don't need to calculate external compensation networks. The 500kHz switching frequency strikes a good balance between efficiency and component size. I particularly like the power-good feature which makes sequencing multiple rails straightforward. For thermal performance, I've run this at 3A at 50°C ambient without issues. The AEC-Q100 qualification also makes it suitable for automotive projects. One tip: use a good quality inductor with low DCR for best efficiency."
Excellent efficiency and ease of use for industrial power supply designs
— David Wang, BeiLuo
Frequently Asked Questions
What is the efficiency of XHSC-Buck-5V3A at different loads?
The XHSC-Buck-5V3A achieves excellent efficiency across the load range: At 5V output from 12V input, efficiency is approximately 92% at light load (10% load), peaks at 95% around 50-70% load (1.5-2A), and maintains 93-94% at full 3A load. At 3.3V output, efficiency is slightly lower due to higher step-down ratio: 89% at light load, 93% peak, and 91% at full load. The synchronous rectification eliminates diode losses, providing significant efficiency improvement over non-synchronous converters especially at low output voltages. For best efficiency, operate the converter in the 30-80% load range when possible.
Expect 93-95% efficiency in typical operating conditions. Contact our FAE team for detailed efficiency curves at your specific operating point.
What external components are required for XHSC-Buck-5V3A?
The XHSC-Buck-5V3A requires minimal external components: 1) Input capacitor - 10μF ceramic capacitor close to the input pins for high-frequency bypass, plus bulk capacitance (47-100μF) for input filtering. 2) Output capacitor - 22-47μF ceramic capacitor for output filtering and loop stability. 3) Inductor - 4.7μH to 10μH depending on switching frequency and ripple requirements. 4) Feedback resistors - Two resistors to set output voltage (typically 10kΩ and divider resistor). 5) Optional soft-start capacitor - For controlled startup timing. XHSC provides recommended component values and part numbers in the datasheet. Total BOM cost is typically under $0.50 for passives.
Use XHSC recommended component values for reliable operation. Contact LiTong for BOM optimization suggestions.
How do I calculate the inductor value for XHSC-Buck-5V3A?
The inductor value for XHSC-Buck-5V3A can be calculated using the formula: L = (Vout × (Vin - Vout)) / (Vin × fsw × ΔIL), where Vout is output voltage, Vin is input voltage, fsw is switching frequency (500kHz), and ΔIL is inductor ripple current (typically 30% of Iout). For example, with 12V input, 5V output, and 3A load: L = (5 × (12-5)) / (12 × 500k × 0.9) = 6.5μH. Standard value 6.8μH would be selected. The inductor should have saturation current rating at least 20% above peak current (Iout + ΔIL/2). For this example, saturation current should be at least 4A. XHSC recommends shielded inductors for EMI-sensitive applications.
Use 6.8μH to 10μH for most applications. Contact our FAE team for inductor recommendations specific to your operating conditions.
What is the thermal performance of XHSC-Buck-5V3A?
The XHSC-Buck-5V3A features excellent thermal performance due to its high efficiency and thermally enhanced packages. At 3A output with 12V input and 5V output (15W output, 16W input, 1W loss), the junction temperature rise is approximately 25°C above ambient in the SOP-8 package with standard copper area. This means at 50°C ambient, junction temperature is approximately 75°C, well below the 125°C maximum. For higher ambient temperatures or continuous full-load operation, increasing copper area under the IC or adding thermal vias can reduce temperature by an additional 5-10°C. The IC includes thermal shutdown protection at 160°C with 20°C hysteresis.
No heat sink required for most applications. Ensure adequate copper area for thermal dissipation in high ambient temperature applications.
Can XHSC-Buck-5V3A be used for automotive applications?
Yes, the XHSC-Buck-5V3A is AEC-Q100 qualified and suitable for automotive applications. The device meets Grade 1 requirements (-40°C to +125°C ambient) and includes features specifically for automotive use: 1) Load dump protection - Withstands automotive load dump transients up to 60V. 2) Cold crank capability - Continues operation during battery voltage dips to 4.5V. 3) Enhanced EMI performance - Meets automotive CISPR 25 Class 5 emissions requirements. 4) Robust protection - Comprehensive OCP, OVP, UVLO, and thermal protection. Typical automotive applications include body control modules, infotainment systems, ADAS cameras, and LED lighting drivers. Contact our automotive FAE team for EMC test reports and functional safety documentation.
Suitable for automotive applications requiring up to 3A output. Verify specific requirements with our automotive FAE team.
How does the power-good feature work on XHSC-Buck-5V3A?
The XHSC-Buck-5V3A includes an open-drain power-good (PG) output that indicates when the output voltage is within regulation. The PG pin pulls low when output voltage is below 90% of target and goes high-impedance when output reaches 95% of target. This provides approximately 5% hysteresis to prevent oscillation. The PG output can be pulled up to any voltage up to 18V through an external resistor (typically 10kΩ to 100kΩ). This feature is useful for: 1) Power sequencing - Enable downstream converters only when main rail is stable. 2) System monitoring - Connect to MCU GPIO for power status monitoring. 3) Reset generation - Combined with RC delay for processor reset. 4) ORing - Multiple PG signals can be wire-ANDed for system-wide power-good indication.
Use power-good for proper power sequencing in multi-rail systems. Contact our FAE team for sequencing circuit design assistance.