The MAXm38643 is an ultra-low IQ (330Na) step-down module that converts 18v to 5The input voltage in the 5V range is stepped down to 07v to 3Wide output voltage range of 3V (using a single resistor on the RSEL pin). The output voltage can be programmed at start-up using a single external resistor between the RSEL pin and GND. A 0 for setting the output voltage without using the RSEL pin is also available5V to 5V factory pre-programmed fixed output voltage version. In this case, the RSEL pin in the module remains floating.
The module offers powerful performance characteristics. To optimize efficiency and transient response over the entire load operating range, the module automatically switches between ultra-low power mode (ULPM), low power mode (LPM), and high power mode (HPM) based on load current to better serve the load. The device is over-regulated in the ULPM to improve efficiency and facilitate the output capacitance to handle transient load currents. The device has a 90% duty cycle limit. When the device is turned off, the active discharge resistor pulls OUT to ground.
Ordering Information:
Apply. Bluetooth LE devices.
Hearables.
Portable products with limited space.
Products powered by single-cell lithium-ion and coin cell batteries.
Ultra-low-power Internet of Things, NB Internet of Things.
Wearables.
Wired and wireless products.
Features and Benefits:
Extend battery life.
330nA ultra-low quiescent supply current.
Shutdown current: 1nA
The peak efficiency is 96% and the efficiency is over 88% at 10 A
Easy to use – for common operations.
Input Range: 18v to 55v
Single resistor adjustable vout: 07v to 33v
Factory preprogrammed vout: 05V to 5V
Output Voltage Accuracy: 175%
Up to 600mA load current capability.
Protect systems in multiple use cases.
It has a reverse current blocking function during shutdown.
Active discharge function.
Downsize and reliability.
Temperature range: -40°C to +85°C
2.1mm x 2.6mm 10-pin EMGA package.