BQ24311DSGR

The bq24311DSGR is TI’s stand‑alone charge-management IC for a single‑cell Li‑ion/Li‑polymer battery with power-path management. It provides a complete, no‑programming charger that allows a system load to run while the battery is charging. Typically powered from a 5V input (USB), it charges the cell to 4.2V using a constant‑current/constant‑voltage (CC/CV) profile, with preconditioning for deeply discharged cells, automatic termination, and a configurable charge current. The device includes temperature sensing, current limiting, over‑voltage/short‑circuit protection, thermal shutdown, and a safety timer. It integrates the charging FET and control circuitry, reducing external components. The DSGR suffix denotes a specific package variant used in TI’s catalog. Applications include charging peripherals, mobile devices, wearables, and handheld gadgets that need a compact, efficient Li‑ion charger without a microcontroller.

Direct drop‑in equivalents for BQ24311DSGR don’t exist. Use TI’s cross-reference tool to find a device with identical specs (input, current, pinout, package). In TI’s family, similar Li-Ion chargers include the BQ24310 and BQ24312. If exploring non‑TI options, common equivalents are Microchip MCP73831/MCP73833 (1‑cell Li‑ion chargers).

Here are concise features of bq24311DSGR:
- 1-cell Li-Ion/Li-Polymer battery charger with integrated high-side FET and power-path management
- 5V USB input with programmable charge current (via resistor) for efficient charging
- Constant-current/constant-voltage charging with 4.2V regulation and end-of-charge termination
- Pre-charge for low-capacity/deep-discharge cells
- Battery temperature monitoring (NTC input) for safe charging
- Dynamic power-path keeps the system powered while charging the battery
- Comprehensive safety: input undervoltage/overvoltage, battery overcurrent/short-circuit, thermal regulation
- Status indicators for charging, completion, and fault conditions (easy host integration)
- Small package suitable for portable devices (DSGR variant)
Note: For exact electrical limits (max charge current, termination threshold, temperature limits) refer to the TI datasheet.

- Pin count: 8 pins in the DSG package (WSON-8).
- Function: Single-cell Li‑ion/Li‑polymer battery charger with power-path management (CC/CV charging, system power path from input to SYS, battery protection). Key pins typically include IN (input), BAT (battery), SYS (system output), PROG (sets charge current via a resistor), CE (enable), THERM (thermistor input), GND, and STAT (status output).

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: TI is a United States-based multinational technology company that designs and manufactures semiconductors and integrated circuits, including analog, mixed-signal, and embedded processing products, and is headquartered in Dallas, Texas.

- On-board charging for single-cell Li-Ion/Li-polymer batteries using USB or wall adapters
- Power-path management to power the system while charging
- Suitable for consumer electronics: mobile phones, cameras, MP3 players, handheld gaming devices
- Ideal for docks, cradles, and accessories that require simultaneous charging and operation
- Used in reference designs and development boards for portable equipment needing compact Li-Ion charging solutions

The BQ24311DSGR comes in a 16‑pin QFN package (4×4 mm) with an exposed pad (lead‑free/RoHS compliant).