IP6538
High-efficiency synchronous buck-boost converter with wide input range, ideal for power bank and battery-powered appl...
Product Overview
Description
The IP6538 is a high-efficiency synchronous buck-boost converter designed for battery-powered applications.
It seamlessly transitions between buck and boost modes as input voltage varies above and below the output.
The IC delivers up to 18W output power with excellent efficiency across the entire battery discharge curve.
Product Series
IP
Primary Application
Power banks
Key Features
- Seamless buck-boost operation
- Wide input voltage range
- High efficiency up to 96%
- Low RDS(on) integrated MOSFETs
- Programmable output voltage
- Comprehensive protection features
- Power good indicator
- Compact QFN package
Specifications
| Input Voltage | 2.5V to 14V |
|---|---|
| Output Voltage | 3.0V to 14V (configurable) |
| Max Output Current | 3A |
| Max Output Power | 18W |
| Efficiency | Up to 96% |
| Switching Frequency | 500kHz |
| Package | QFN-24 (4x4mm) |
| Operating Temperature | -40°C to +85°C |
Applications
Power banks
Electronic system design
Battery-powered devices
Battery and charging management
Portable electronics
Electronic system design
USB power delivery
Electronic system design
Industrial handheld devices
Industrial automation and control
FAE Expert Insights
"The IP6538 is an excellent choice for power bank designs requiring wide input range and high efficiency. I particularly appreciate the seamless mode transition - there's no glitch or instability when crossing the buck-boost boundary. In my designs, I've achieved consistent 93-96% efficiency across the entire lithium battery voltage range. The integrated MOSFETs reduce BOM cost and PCB space significantly. For designers creating power banks or battery-powered products, this IC provides a reliable, efficient solution with minimal external components."
Seamless buck-boost with 96% peak efficiency
— Lisa Zhang, BeiLuo
Frequently Asked Questions
How does the buck-boost transition work in IP6538?
The IP6538 uses a seamless transition topology that eliminates mode-switching glitches. When input voltage is higher than output, it operates in buck mode. When input drops below output, it automatically transitions to boost mode. The transition is smooth with no output voltage disturbance. This is achieved through a 4-switch H-bridge topology that reconfigures based on input/output relationship.
The seamless transition ensures stable output regardless of battery voltage. Ideal for applications using lithium batteries with voltage ranging from 4.2V to 3.0V.
What is the recommended PCB layout for IP6538?
Proper PCB layout is critical for stable operation. Place input and output capacitors close to the IC with short, wide traces. Use a solid ground plane under the IC and connect all ground pins directly to it. Route the switching node away from sensitive signals. Ensure adequate copper area for heat dissipation, especially for the exposed pad. Follow the layout guidelines in the datasheet for optimal performance.
Follow the reference layout in the datasheet. Contact us for layout review services.
Can IP6538 be used for USB PD applications?
Yes, IP6538 is ideal for USB PD power bank applications. It can work with protocol ICs like IP2723T to create complete PD solutions. The wide input range accommodates lithium battery voltage variation (3.0V-4.2V), while the output can be configured for 5V, 9V, 12V, or other PD voltage levels. The high efficiency maximizes battery runtime.
Combine IP6538 with IP2723T for complete USB PD power bank solutions. Reference designs are available.
What is the switching frequency of IP6538?
The IP6538 operates at a fixed 500kHz switching frequency. This frequency provides a good balance between efficiency, component size, and EMI. The frequency is high enough to allow small inductors and capacitors, yet low enough to maintain good efficiency and minimize switching losses. The fixed frequency simplifies EMI filtering design.
The 500kHz switching frequency suits most applications. Consider EMI requirements when designing the PCB.
How do I set the output voltage?
Output voltage is set using external resistor dividers connected to the FB pin. The feedback reference voltage is typically 0.6V or 1.0V depending on configuration. Calculate resistor values using the formula: Vout = Vref × (1 + R1/R2). The datasheet provides detailed calculations and recommended values for common output voltages. Some variants support I2C voltage adjustment.
Use resistor dividers for fixed outputs, I2C for dynamic adjustment. Contact us for configuration assistance.
What is the quiescent current of IP6538?
The IP6538 features low quiescent current, typically less than 100μA in standby mode. This low current consumption is important for battery-powered applications to maximize standby time. When the converter is active, the operating current increases with load, but efficiency remains high across the load range.
The low quiescent current makes IP6538 suitable for battery-powered applications. Review power consumption specs in the datasheet.