Connecting Battery for Secondary Power

flux

2:59

Querying USB-C PD Solutions.

Setting Up the Library Queries.

Considering Project Context.

Formulating Library Queries.

Accessing knowledge base.

Searching for components.

Searching library for: "Standalone USB-C PD sink controller for power-only applications, no MCU required, capable of requesting fixed 9 V PDO from a USB-C source. Prefer resistor- or NVM-configurable profiles. Accepts 5–20 V VBUS, provides status pins, QFN/QFP/SOP packages. Examples to consider: STUSB4500, CYPD3177."

Searching library for: "2-cell (2S) Li-Ion charger IC with NVDC/power-path management and buck-boost operation from 5–12 V input (USB/PD). Must provide SYS output for system while charging, support 8.4 V charge voltage, configurable charge current, I2C or pin-config. Examples: TI BQ25713, BQ25792, MPS MP2762A."

Creating search plan for: "Standalone USB-C PD sink controller for power-only applications, no MCU required, capable of requesting fixed 9 V PDO from a USB-C source. Prefer resistor- or NVM-configurable profiles. Accepts 5–20 V VBUS, provides status pins, QFN/QFP/SOP packages. Examples to consider: STUSB4500, CYPD3177. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 25"

Creating search plan for: "2-cell (2S) Li-Ion charger IC with NVDC/power-path management and buck-boost operation from 5–12 V input (USB/PD). Must provide SYS output for system while charging, support 8.4 V charge voltage, configurable charge current, I2C or pin-config. Examples: TI BQ25713, BQ25792, MPS MP2762A. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 25"

Searching: "Standalone USB-C Power Delivery sink controller that requests a fixed 9V PDO, resistor- or NVM-configurable profiles, no MCU required, accepts 5–20V VBUS, provides status pins, available in QFN/QFP/SOP packages"

Searching: "2S (2-cell) Li-ion charger IC with NVDC or power-path management, buck-boost charger operation from 5–12 V input (USB/PD), provides SYS output for system power while charging, supports 8.4 V charge voltage, configurable charge current, I2C or pin-programmable configuration, SMD packages"

Found 52 results.

Searching: "2-cell (2S) Li-Ion charger IC with NVDC/power-path management and buck-boost operation from 5–12 V input (USB/PD). Must provide SYS output for system while charging, support 8.4 V charge voltage, configurable charge current, I2C or pin-config. Examples: TI BQ25713, BQ25792, MPS MP2762A. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 25"

Found 36 results.

Searching: "Standalone USB-C PD sink controller for power-only applications, no MCU required, capable of requesting fixed 9 V PDO from a USB-C source. Prefer resistor- or NVM-configurable profiles. Accepts 5–20 V VBUS, provides status pins, QFN/QFP/SOP packages. Examples to consider: STUSB4500, CYPD3177. --- Suggested search options: fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 25"

Finished searching for components.

Validating Charger Options.

Preparing to suggest components.

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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