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Product Detailed Parameters
- Description：IC REG BOOST 5.25V 350MA 9WLCSP
- Series：TinyBoost®
- Mfr：Fairchild Semiconductor
- Package：Bulk
- Function：Step-Up
- Output Configuration：Positive
- Topology：Boost
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：2.7V
- Voltage - Input (Max)：4.8V
- Voltage - Output (Min/Fixed)：5.25V
- Voltage - Output (Max)：-
- Current - Output：350mA
- Frequency - Switching：2.5MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：9-UFBGA, WLCSP
- Supplier Device Package：9-WLCSP (1.22x1.22)
- Grade：-
- Qualification：-
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Overview
The FAN48611UC53X is a synchronous boost switching regulator IC from the TinyBoost series, manufactured by Fairchild Semiconductor (now onsemi). It provides a fixed positive output voltage of 5.25V with a maximum output current of 350mA. The device operates at a fixed switching frequency of 2.5 MHz and supports an input voltage range up to 4.8 V. Packaged in a compact 9-WLCSP (UFBGA) format, it is designed for space-constrained portable applications requiring efficient DC-DC conversion.
Feature Summary
- Synchronous rectification architecture for enhanced power efficiency
- Fixed output voltage configuration eliminates external feedback resistor requirements
- Compact WLCSP package design suitable for mobile and handheld devices
Applications
- Portable consumer electronics
- Mobile phone power management
- Handheld computing devices
- Battery-powered systems
Procurement Notes
Verify that the component matches the specific Fairchild Semiconductor or onsemi manufacturing origin, as the brand transition may affect part marking. Confirm the 9-WLCSP package type and ensure the fixed 5.25V output specification aligns with system requirements. Check RoHS compliance status and environmental certifications against the official datasheet before procurement.
Selection Notes
Select this component when a fixed 5.25V output is required without external programming resistors. Ensure the load current does not exceed 350mA and the input supply remains within the 4.8 V maximum limit. Consider the 2.5 MHz switching frequency for EMI constraints and the small footprint advantage of the WLCSP package for dense PCB layouts.
Part Context
This device belongs to the TinyBoost family of synchronous boost regulators, optimized for low-power portable applications. It integrates high-side and low-side switches to maximize efficiency in a minimal footprint. The fixed-output variant simplifies design implementation compared to programmable counterparts, offering a straightforward solution for standard voltage rails.
Replacement Considerations
Check for direct cross-reference part numbers within the onsemi portfolio that share identical electrical specifications and pinout compatibility. Verify package dimensions and thermal characteristics if substituting with other manufacturers' synchronous boost regulators.
