Description
The FAN53741 is a 2.5 MHz step−down switching voltage
regulator, that delivers a fixed output from an input voltage supply of
2.3 V to 5.5 V. Using a proprietary architecture with synchronous
rectification, the FAN53741 is capable of delivering a peak efficiency
of 97% and can support a max load of 1300 mA.
The regulator operates at a nominal fixed frequency of 2.5 MHz,
which reduces the value of the external components achieving a total
solution size of 5.24 mm2. At moderate and light load, Pulse
Frequency Modulation (PFM) is used to operate the device with a low
quiescent current of 60 A. Even with such a low quiescent current,
the part exhibits excellent transient response during load swings. At
higher loads, the system automatically switches to fixed−frequency
control, operating at 2.5 MHz. In Shutdown Mode, the supply current
drops below 0.5 A, reducing power consumption.
The FAN53741 is available in 6−bump, 0.4 mm pitch, Wafer−Level
Chip−Scale Package (WLCSP).

Features
• 60 A Typical Quiescent Current
• 5.24 mm2 Total Solution Size
• 1300 mA Output Current Capability
• Programmable Output Voltage 0.6 V to 3.3 V in 25 mV Steps via I2C
Functionality
• Programmable Current Limit 530 mA to 2150 mA in 108 mA Steps
via I2C Functionality
• 2.3 V to 5.5 V Input Voltage Range
• 2.5 MHz Fixed−Frequency Operation
• Best−in−Class Load Transient Response
• Internal Soft−Start Limits Battery Current Below 150 mA to avoid
Brown−out Scenarios
• Protection Faults (UVLO, OCP and TSP)
• Thermal Shutdown and Overload Protection
• 6−Bump WLCSP, 0.4 mm Pitch
• This is a Pb−Free Device

Applications
• Smart Phones
• Wearables
• Smart Watch
• Health Monitoring
• Sensor Drive
• Energy Harvesting
• Utility and Safety Modules
• RF Modules