Connecting Battery for Secondary Power

flux

Got it: USB-C with PD at 9 V, and a 2S Li‑Ion charger. Below are clean, simple pairings that make USB the primary source and seamlessly charge/run the system. Per best practice, size your power stages to the negotiated PD voltage/current you plan to request (e.g., 9 V), and consider headroom if you may later allow 12 V.
USB-C PD sink (standalone, fixed 9 V capable)
  • STUSB4500QTR - Standalone PD sink, widely used for fixed PDOs with NVM profiles.
  • CYPD3177-24LQXQ - Standalone PD sink, very simple bring-up for power-only sinks.
  • AP33771 - Compact PD sink controller option.
2S Li‑Ion charger with NVDC/power-path (buck‑boost, 5–12 V input capable)
  • BQ25713RSNR - 1–4S NVDC buck‑boost charge controller, I2C control.
  • BQ25792RQMR - Compact NVDC charger IC option.
  • MP2762A - 2S NVDC buck‑boost charger with integrated FETs.
Recommended pairs
Next, tell me:
  • Target charge current (e.g., 2 A) and peak system load while on USB.
  • Whether 9 V is fixed forever, or you might later request 12 V.
Pick a pair and I will verify the datasheets for 9 V operation and then add the controller, charger, and minimal support parts to your project.
Pick STUSB4500 + MP2762A
Pick CYPD3177 + BQ25713
Need 2A charge, 4A load
Add parts to project
Compare AP33771 vs STUSB4500
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  • Generic Inductor
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Raspberry Pi Pico Template

Raspberry Pi Pico Template thumbnail
Here's your template for the famous Raspberry Pi Pico
Powerful, flexible microcontroller boards, available from $4
The Raspberry Pi Pico series is a range of tiny, fast, and versatile boards built using RP2040
#project-template #template #raspberry #pi #pico

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

LCSC

$5.07

Controls