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Product Detailed Parameters
- Description：IC REG BUCK PROG 5A 20WLCSP
- Series：TinyBuck®
- Mfr：Fairchild Semiconductor
- Package：Bulk
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Programmable
- Number of Outputs：1
- Voltage - Input (Min)：2.5V
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：0.6V
- Voltage - Output (Max)：1.39V
- Current - Output：5A
- Frequency - Switching：2.4MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-
- Mounting Type：Surface Mount
- Package / Case：20-UFBGA, WLCSP
- Supplier Device Package：20-WLCSP (1.96x1.56)
- Grade：-
- Qualification：-
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Overview
The FAN53200UC35X is a digitally programmable synchronous step-down switching regulator from the TinyBuck family, manufactured by Fairchild Semiconductor (now onsemi). It delivers up to 5A of output current with a fixed 2.4MHz switching frequency. The device accepts an input voltage range of 2.5V to 5.5V and provides a programmable output voltage between 0.6V and 1.3875V. It utilizes a 20-pin WLCSP package for compact board space utilization.
Feature Summary
- Digitally programmable output voltage via I2C interface
- Integrated synchronous rectification for high efficiency
- Fixed 2.4MHz switching frequency enables small external component size
Applications
- Portable consumer electronics requiring compact power solutions
- Embedded systems with single-rail power distribution needs
- Battery-powered devices utilizing standard lithium-ion cells
Procurement Notes
Verify the manufacturer designation carefully, as Fairchild Semiconductor's semiconductor division was acquired by onsemi. Ensure the datasheet corresponds to the specific revision required for your design. Confirm the package type matches the footprint in your schematic. Check RoHS compliance status if mandated by your regional regulations. Validate the operating temperature range against your environmental constraints.
Selection Notes
Select this component when a high-current, digitally controlled buck converter is needed in a minimal footprint. The 2.4MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the I2C interface requirements for system integration. Evaluate the thermal performance within the WLCSP package for your specific PCB layout. Compare efficiency curves at your target load and voltage conditions.
Part Context
This part belongs to the TinyBuck series, designed for space-constrained applications. It represents a transition period where Fairchild branding may still appear on legacy documentation or inventory before full migration to onsemi branding. The UC35X suffix typically denotes specific pinout or packaging variations within the broader FAN53200 family.
Replacement Considerations
Check for direct cross-references within the FAN53200 family. Verify compatibility with onsemi-branded equivalents if sourcing from updated supply chains. Ensure pin-to-pin compatibility if substituting in existing designs.
