Simplified Block Diagram
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- Pin-Programmable Output Voltages
- 300mA Output Current
- Low 90mV Dropout at 100mA Load
- Open-Drain, Active-Low RESET (MAX8633)
- Low 45µVRMS Output Noise (MAX8634/MAX8636)
- Low 54µA Quiescent Supply Current
- Low < 1µA Maximum Shutdown Current
- Output Current Limit
- Thermal Shutdown
- Cellular and Cordless Phones
- Handheld Instruments
- Notebook Computers
- PDAs and Digital Cameras
- Small LCD Displays
- Wireless LAN Cards
The MAX8633 features an open-drain, active-low RESET output to monitor OUT2, eliminating external components and adjustments. The MAX8633 asserts an active-low RESET signal (120ms minimum timeout) when VOUT2 drops below 87% of the nominal output voltage. The MAX8634/MAX8636 feature a noise bypass input to the internal reference for low output noise (45µVRMS typ). The MAX8634/MAX8635 provide independent active-low SHDN inputs for disabling the regulators, while the MAX8633/MAX8636 provide a single active-low SHDN input for disabling both regulators.
The MAX8633/MAX8635/MAX8636 have two logic inputs that select one of nine preset output-voltage combinations, eliminating external 1% resistors, as well as inventory burden. The MAX8634 has one logic input to select three output-voltage options.
The MAX8633–MAX8636 are available in an 8-pin, 2mm x 2mm µDFN package for minimizing footprint, and an 8-pin, 3mm x 3mm TDFN package for higher power dissipation. The devices are specified over the extended temperature range (-40°C to +85°C). All packages are lead free.