The MAX77845 is a high-efficiency, high-performance buck-boost converter. It supports a wide input voltage range of 2.5V to 16V, enabling direct conversion from sources such as up to 3-cell Li+ batteries, USB power delivery (PD), and 12V DC supply rails. The converter provides a wide output voltage range of 3V to 15V, making it suitable for a broad range of applications.
The device delivers up to 4.5A of output current in buck mode and up to 3A in boost mode. It operates in PWM mode and incorporates an automatic SKIP mode to enhance efficiency under light load conditions. With a peak efficiency of 94%, a low quiescent current, and a compact solution size, the MAX77845 is well-suited for battery-powered, space-constrained designs.
The default output voltage is 5V when using internal feedback resistors. It can be configured to other default output voltages using external feedback resistors. Additionally, the output voltage is dynamically adjustable through an I2C-compatible interface.
The device includes dedicated control pins EN, BIASEN, POKB/INTB, FPWM/SYNC, and SEL for direct hardware control. Additional configuration options, including soft-start time, DVS slew rate, switching current limit, and switching frequency, can be accessed through the I2C interface. The programmable switching frequency and support for external clock synchronization facilitate system optimization in noise-sensitive environments.
The RSEL pin and I2C-programmable current limit enable the use of lower-profile, smaller external components that are optimized for specific applications. The MAX77845 integrates a comprehensive set of protection features to ensure safe operation under abnormal conditions.
The device is available in a 2.82mm × 1.69mm, 28-bump wafer-level package (WLP).
APPLICATIONS
- USB Power Delivery (USB-PD) OTG
- USB VBUS Supply and Dual Role Power (DRP) Ports
- DSLR, DSLR Lens
- Display Power
- Up to 3-Cell Li-Ion Battery Applications
- Wireless Charging Accessories
- AR/VR ToF Bias Power
- Notebook Computer, Tablet PC
