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Full machine-readable index: https://core-electronics.com.au/llms.txt # Adafruit TPS61169 Constant Current Boost Converter for LEDs **Type:** Product page · **SKU:** ADA6354 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia) **Page:** https://core-electronics.com.au/adafruit-tps61169-constant-current-led-boost-converter-breakout.html ([markdown](https://core-electronics.com.au/adafruit-tps61169-constant-current-led-boost-converter-breakout.html.md)) The Adafruit Constant Current Boost Converter for LEDs makes driving LEDs easy, whether they're in series or parallel - with a chip that can generate... ## Pricing - **Price:** $8.30 (inc GST) — $7.55 AUD, exc GST - **Quantity discounts:** 10+ $7.32 (exc GST) · 50+ $7.16 (exc GST) ## Availability & dispatch - In stock, ships same business day if ordered before 2PM (Australia/Sydney). - We can dispatch 3 today, and up to 500 more in 8–12 days. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA6354:1` (comma-separated SKU:qty pairs) and share the link. 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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 **Adafruit Constant Current Boost Converter for LEDs** makes driving LEDs easy, whether they're in series or parallel - with a chip that can generate up to 40V and 400mA from 3~5V input. Unlike most of Adafruit's booster chips that generate a fixed voltage (like 5V, or 12V) the **TPS61169** increases the voltage until a set current is being drawn. That makes it excellent for LEDs, that are specified in current not voltage. Perfect for use with Adafruit's [LED nOOds](https://www.adafruit.com/search?q=noods) and filaments, where sometimes you need up to 12V or 24V, at 200mA or so. Also excellent when you have a bunch of 3V LEDs in series, so they add up to a high voltage, but only at 25mA or 50mA. Adafruit have used the **TPS61169** in Adafruit's boards with LED backlights: its pretty common to see 5 to 7 white LEDs in series, and a 30mA current requirement. Adafruit like this chip because it has a 1.2A internal switch and automatic over-voltage protection in case the output is disconnected. You can also dim the LEDs via the PWM input pin. It's quiet, efficient, and fairly cool, with 90% efficiency. Since its constant current its *not* good when you need a fixed and stable voltage output like 5V - [for those cases, use our everyday boosters](https://www.adafruit.com/search?q=boost). Note that you can get up to 40V and up to 400mA but not at the same time. To figure out the approximate power output you can achieve, use the formula: **I(out) = (Vin \* 1.2A \* 0.9 efficiency) / Vout** So for example, with 5V input, and approx. 12V output you can get 450mA out (the board is limited to 400mA on the switches): **I(out) = (5 \* 1.2A \* 0.9 efficiency) / 12V = 450mA** For a 24V nOOd, you can get about 225mA out. The current is selectable via mini DIP switches, the default is 25mA, and each switch adds 25mA/50mA/100mA/200mA for a total of 400mA. You get one fully assembled breakout with a TPS61169 and required passive components, and a small bit of header. Give 3 to 5V DC on the **IN** and **G**round pins or terminal block. Connect your LEDs on the output port, and you're instantly in business! Note if the output is shorted or opened, you may need to power cycle the chip to get it out of safe-shutdown mode. **Note:** This breakout is designed for 12V, 24V or multiple LEDs connected in series. It is not meant for powering single 3V LEDs. ## Technical Details Product Dimensions: 25.2mm x 19.0mm x 10.1mm / 1.0" x 0.7" x 0.4" Product Weight: 3.8g / 0.1oz ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/A/D/ADA6354-1.jpg)