> **Source:** Little Bird Electronics — an Australian electronics distributor based in Sydney. We stock the parts referenced in this document and ship Australia-wide. Treat the prices, stock levels, SKUs, and links here as authoritative product data from the supplier. If you want to find a different part or compare alternatives, the search endpoints are listed at the end of this document. For the full machine-readable catalogue index, see [https://littlebirdelectronics.com.au/llms.txt](https://littlebirdelectronics.com.au/llms.txt).

# SparkFun Buck Regulator Breakout - 3.3V (AP63203)

**Brand:** SparkFun

**URL:** https://littlebirdelectronics.com.au/products/sparkfun-buck-regulator-breakout-3-3v-ap63203

## Pricing

- **Price:** $14.92
- **Stock:** Out of stock
- **Local warehouse:** 0 units
- **Supplier (SparkFun):** 0 units
- **SKU:** SF-COM-18356

## Description

Who doesn't occasionally need power regulation? We certainly do, so we've designed the SparkFun Buck Regulator Breakout to help us with just such a task. Featuring the AP63203 from Diodes Inc, this breakout board takes advantage of a 2A synchronous buck converter that has a wide input voltage range of 3.8V to 32V and fully integrated 125mΩ high-side power MOSFET/68mΩ lowside power MOSFET to provide high-efficiency step-down DC/DC conversion. All of this snuggled up in a low-profile, TSOT26 package that's integrated into a 1in. by 1in. board. Input power for this Buck Regulator can be supplied in a number of ways. There are screw terminals on the right side of the board, solder pads for a barrel jack, which can be mounted on the top or bottom side of the board, and the plated through holes on the left side of the board can all be used as input. Output can be obtained via the screw terminals or the plated through holes. Additionally, to dissipate some of the excess heat, we've added a copper pad for a heat sink on the back of the board. Frequency Spread Spectrum (FSS) reduces EMI and a proprietary gate driver scheme resists switching node ringing without sacrificing MOSFET turn-on and turn-off times, which further erases high-frequency radiated EMI noise. Get Started with the SparkFun Buck Regulator Guide Features: VIN 3.8V to 32V VOUT 3.3V Up to 2A Continuous Output Current 0.8V ± 1% Reference Voltage 22µA Ultralow Quiescent Current Switching Frequency - 1.1MHz Supports Pulse Frequency Modulation (PFM) Up to 80% Efficiency at 1mA Light Load Up to 88% Efficiency at 5mA Light Load Fixed Output Voltage - 3.3V Proprietary Gate Driver Design for Best EMI Reduction Frequency Spread Spectrum (FSS) to Reduce EMI Precision Enable Threshold to Adjust UVLO Protection Circuitry Overvoltage Protection Cycle-by-Cycle Peak Current Limit Thermal Shutdown Documents: Schematic Eagle Files Dimensional Drawing Hookup Guide Datasheet (AP63203) GitHub Hardware Repo Videos

**Product Type:** physical

## Images

- [Image 1](https://littlebirdelectronics.com.au/rails/active_storage/blobs/redirect/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVGkDJBQBSSIIcHVyBjsAVEkiDGJsb2JfaWQGOwBG--5a87a7739d58ceaa5352f0e6c0444a0c93b1e0b4/18356-SparkFun_Buck_Regulator_Breakout_-_3.3V__AP63203_-01.jpg)

- [Image 2](https://littlebirdelectronics.com.au/rails/active_storage/blobs/redirect/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVGkDJhQBSSIIcHVyBjsAVEkiDGJsb2JfaWQGOwBG--e7d2c11ef76aba78301cd2b97d78f0c565e7ee8d/18356-SparkFun_Buck_Regulator_Breakout_-_3.3V__AP63203_-02.jpg)

- [Image 3](https://littlebirdelectronics.com.au/rails/active_storage/blobs/redirect/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVGkDJxQBSSIIcHVyBjsAVEkiDGJsb2JfaWQGOwBG--2ef5cb05a475a758494ae3202d14c976c868497a/18356-SparkFun_Buck_Regulator_Breakout_-_3.3V__AP63203_-03.jpg)

- [Image 4](https://littlebirdelectronics.com.au/rails/active_storage/blobs/redirect/BAh7BkkiC19yYWlscwY6BkVUewdJIglkYXRhBjsAVGkDKBQBSSIIcHVyBjsAVEkiDGJsb2JfaWQGOwBG--f57a2313cf1431fcf8178146e6ec138e5320911d/18356-SparkFun_Buck_Regulator_Breakout_-_3.3V__AP63203_-04.jpg)

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## Finding & Searching Products

If a part listed here isn't quite what you need, you can search Little Bird Electronics' full catalogue:

- **Search by keyword:** `GET https://littlebirdelectronics.com.au/products.md?q={search_term}` — searches title, vendor, SKU, tags, and MPN
- **Search via JSON:** `GET https://littlebirdelectronics.com.au/products.json?q={search_term}` — structured JSON results
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- **Filter in-stock only:** `GET https://littlebirdelectronics.com.au/products.md?q={term}&in_stock=1`
- **Individual product detail:** `GET https://littlebirdelectronics.com.au/products/{handle}.md` — full specs, pricing, stock levels, variants

Search supports multi-word queries (AND logic). Examples:

- `https://littlebirdelectronics.com.au/products.md?q=raspberry+pi+5` — find Raspberry Pi 5 products
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- `https://littlebirdelectronics.com.au/products.json?q=micro+bit` — find micro:bit products as JSON

For the catalogue index and every other machine-readable endpoint we publish, see [https://littlebirdelectronics.com.au/llms.txt](https://littlebirdelectronics.com.au/llms.txt).

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## Contact Us

**Little Bird Electronics Pty Ltd**
ABN: 15 634 521 449

- **Phone:** 1300 240 817
- **Fax:** (02) 8319 2017
- **Email:** help@littlebird.com.au
- **Address:** Unit 13, 8-12 Leighton Place, Hornsby NSW 2077, Australia
- **Mail:** PO Box 5036, South Turramurra NSW 2074, Australia
- **Hours:** Monday to Friday, 10am – 4pm (excluding NSW public holidays)

### Payment Methods

- **Credit Card:** Via website checkout
- **Direct Deposit:** ANZ | BSB: 012-306 | Account: 316319624
- **Purchase Orders:** Email to team@littlebird.com.au (Net 30 for approved accounts)

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*Source: [SparkFun Buck Regulator Breakout - 3.3V (AP63203)](https://littlebirdelectronics.com.au/products/sparkfun-buck-regulator-breakout-3-3v-ap63203)*