Simplified Block Diagram
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- Compact Layout, Small External Components
- Up to 1A Output Current
- 2.5V to 5.5V Input Voltage Range
- Over 90% Efficiency with Internal Synchronous Rectifier
- 1A Current-Limited Track Mode
- Automatic Track Mode
- Proven PCB Layout
- Fully Assembled and Tested
- Cell Phones
- GPS, PND
- Mobile Internet Devices
The MAX8969 evaluation kit (EV kit) is a fully assembled and tested PCB for evaluating the MAX8969 IC. The IC is a simple 1A step-up converter in a small package that can be used in any single-cell Li-ion application. This IC provides protection features such as input undervoltage lockout, short circuit, and overtemperature shutdown.
The IC transitions to skip mode seamlessly under lightload conditions to improve efficiency. Under these conditions, switching occurs only as needed, reducing switching frequency and supply current to maintain high efficiency.
For higher efficiency when input voltage is closer to the output voltage, two special modes of operation are available: track and automatic track. These modes allow users to balance quiescent current (IQ) vs. transient response time into boost mode. In both modes, the p-channel MOSFET acts as a current-limited switch such that VOUT follows VIN. However, in track mode, the boost circuits are disabled and the system controls the boost function with the EN, TREN inputs (IQ = 30µA). In automatic track mode (ATM), the boost circuits are enabled and the device automatically transitions into boost mode when VIN falls to 95% of the target VOUT (IQ = 60µA).