> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # SparkFun BabyBuck Regulator Breakout - 5V (AP63357) **Type:** Product page · **SKU:** COM-21256 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia) **Page:** https://core-electronics.com.au/sparkfun-babybuck-regulator-breakout-5v-ap63357.html ([markdown](https://core-electronics.com.au/sparkfun-babybuck-regulator-breakout-5v-ap63357.html.md)) The SparkFun BabyBuck Regulator Breakout - 5V features the AP63357, a 3.5A synchronous buck converter with a wide input voltage range of 3.8V to 32V... ## Pricing - **Price:** $10.20 (inc GST) — $9.27 AUD, exc GST - **Quantity discounts:** 5+ $8.99 (exc GST) · 25+ $8.81 (exc GST) · 100+ $8.44 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 2 today, and up to 700 more in 5–11 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=COM-21256:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/COM-21256:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description The SparkFun 5V BabyBuck Regulator Breakout features the AP63357 from Diodes Inc., a 3.5A synchronous buck converter with a wide input voltage range of 3.8V to 32V. The fully integrated 74mO high-side power MOSFET/40mO low-side power MOSFET provides a high-efficiency step-down DC/DC conversion. The [BabyBuck regulator](https://www.sparkfun.com/categories/tags/babybuck) is a minimalistic version of our [buck regulator boards](https://www.sparkfun.com/categories/tags/buck-boost). This board is configured to provide a regulated 5V output and features a high-voltage `EN` *(enable)* control pin that is rated up to 32V. On the back of the board, a small copper pad is available to dissipate excess heat with a heat sink. With only four PTH pins for connecting input and output power, everything fits on a mere 0.63in. x 0.52in. board layout. Check out the [SparkFun Buck Regulator Breakout - 5V (AP63357)](https://core-electronics.com.au/search/?q=21255), for the larger, full-feature version of this board. **Note:** While the AP63357 is rated up to a 3.5A output, users should expect a 3A maximum with our boards due to thermal constraints. The boards can output 3.5A but would require a sufficient amount of active cooling. [Get Started with the SparkFun AP63357 Buck Regulator Breakout Hookup Guide](https://docs.sparkfun.com/SparkFun_Buck_Regulator_AP63357DV-7)### Features **BabyBuck Board Features:** - 0.63" x 0.52" PCB layout - Four 0.1" spaced PTH pins - `VIN` - Power In (6V to 32V) - `GND` - Common Ground - `VOUT` - Power Out (Regulated 5V) - `EN` - Enable (Pull high to enable the power output) - 0.5" x 0.6" Plated copper pad *(for heat sinks)* **AP63357 Features:** - VIN 3.8V to 32V - 3.5A Continuous Output Current - 0.8V ± 1% Reference Voltage - 22µA Low Quiescent Current (Pulse Frequency Modulation) - 450kHz Switching Frequency - Supports Pulse Frequency Modulation (PFM) - Up to 86% Efficiency at 5mA Light Load - Proprietary Gate Driver Design for Best EMI Reduction - Frequency Spread Spectrum (FSS) to Reduce EMI - Low-Dropout (LDO) Mode - Power Good Indicator with 5M? Internal Pull-up - Precision Enable Threshold to Adjust UVLO - Protection Circuitry - Undervoltage Lockout (UVLO) - Output Undervoltage Protection (UVP) - Cycle-by-Cycle Peak Current Limit - Thermal Shutdown ### Documents - [Schematic](https://core-electronics.com.au/attachments/localcontent/schematic-BabyBuck5V_10553f62d91.pdf) - [Eagle Files](https://core-electronics.com.au/attachments/localcontent/eagle_files-BabyBuck5V_151920da1a7.zip) - [Board Dimensions](https://core-electronics.com.au/attachments/localcontent/dimensions-BabyBuck5V_6755957cbe9.pdf) - [Hookup Guide](https://docs.sparkfun.com/SparkFun_Buck_Regulator_AP63357DV-7) - [Datasheet](https://core-electronics.com.au/attachments/localcontent/AP63356-AP63357_16993a82757.pdf) (AP63357) - [Product Page](https://www.diodes.com/part/view/AP63357/) (AP63357) - [Technical Documentation](https://www.diodes.com/part/view/AP63357/#tab-details) - [Diodes Technical Support Page](https://www.diodes.com/about/contact-us/technical-support/) - [GitHub Hardware Repo](https://github.com/sparkfun/SparkFun_Buck_Regulator_AP63357DV-7) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/C/O/COM-21256-1.jpg)