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Product Detailed Parameters
- Description：IC REG BOOST 4.5V 1A 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)：2.5V
- Voltage - Input (Max)：4.8V
- Voltage - Output (Min/Fixed)：4.5V
- Voltage - Output (Max)：-
- Current - Output：1A (Switch)
- 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 FAN48610BUC45X is a synchronous step-up DC-DC converter from the TinyBoost series, manufactured by Fairchild Semiconductor (now onsemi). It operates with an input voltage range of 2.3V to 4.5V and provides a fixed output of 4.5V. The device supports a switch current of 1A and functions at a switching frequency of 2.5 MHz. Packaged in a 9-pin WLCSP, it is designed for low-power applications requiring regulated rails from single-cell lithium-ion batteries.
Feature Summary
- Synchronous rectification architecture for improved efficiency
- Fixed output voltage configuration
- Compact wafer-level chip scale packaging
Applications
- Single-cell Li-Ion battery powered devices
- Portable consumer electronics
- Low-power embedded systems
Procurement Notes
Verify the manufacturer designation, as Fairchild Semiconductor's power management division was acquired by onsemi. Confirm the specific suffix 'BUC45X' matches the required 4.5V fixed output and 9-pin WLCSP package. Ensure documentation references the correct legacy branding if sourcing from original Fairchild stock or current onsemi channels.
Selection Notes
Select this component when a compact solution is needed to boost a single-cell lithium-ion battery voltage to a stable 4.5V rail. The 2.5 MHz frequency allows for smaller external passive components compared to lower-frequency regulators. Verify that the 1A switch current meets the load requirements and that the WLCSP footprint fits the PCB layout constraints.
Part Context
This part belongs to the TinyBoost family of synchronous boost regulators. These devices are engineered for space-constrained portable applications. The FAN48610 series typically offers fixed output options, simplifying design implementation by eliminating external feedback resistors while maintaining high efficiency in small form factors.
Replacement Considerations
Check for equivalents within the FAN48610 series with different output voltages if system requirements change. Verify pinout compatibility with other TinyBoost variants before substitution.
