Device Overview
BQ25173DSGR is an 800-mA linear charger intended for one- to four-cell supercapacitor stacks. Its normal input operating range is 3 V to 18 V; the 40-V figure belongs to input-tolerance / absolute-limit context and is not extra normal operating headroom. Charge current is set externally from 10 mA to 800 mA, while the FB network programs the supercapacitor regulation voltage up to the documented 10.5-V maximum.
Confirmed Technical and Ordering Data
| Parameter | Confirmed value | Scope / condition |
|---|---|---|
| Device Function | 800-mA linear charger for 1- to 4-cell supercapacitors | |
| Input Voltage | 3 to 18 V | operating range; 40 V is input-tolerant / absolute-limit context, not the normal operating maximum |
| Output Voltage or Range | up to 10.5 V | maximum regulated output / charge voltage; FB resistor network programs the supercapacitor regulation voltage |
| Current Rating | 10 to 800 mA | programmable charge-current range; set by external ISET resistor |
| Leakage Current | 350 nA | automatic sleep-mode leakage |
| Disabled Input Leakage | 2 µA | input leakage with charging disabled |
| Accuracy | charge voltage ±1%; charge current ±10% | manufacturer feature limits |
| Protection Features | 18-V input overvoltage protection; 1000-mA overcurrent protection; 125 °C thermal regulation; 150 °C thermal shutdown | also includes OUT short-circuit and ISET pin short/open protection |
| Zero Volt Charge | Supports charging supercapacitor from 0 V | |
| Package | WSON-8 (DSG) | exact orderable package |
| Temperature Range | -40 to 125 °C | exact orderable/package option |
Engineering Selection Guidance
The current-setting and voltage-setting networks do different jobs. ISET establishes the 10-to-800-mA charge-current target, while the FB divider establishes the supercapacitor regulation voltage. A design therefore has to select both values around the required stack voltage, available input source, dissipation and required charge time rather than treating the 800-mA headline as a fixed operating point.
The 3-to-18-V operating input range should be separated from the 40-V input-tolerance limit. Protection includes an 18-V input overvoltage threshold, 1000-mA overcurrent protection, 125 °C thermal regulation and 150 °C thermal shutdown. The device can also start charging a supercapacitor from 0 V, which matters when the storage element may be fully discharged.
Lifecycle and Procurement
Texas Instruments lists BQ25173DSGR as Active. This exact orderable uses the WSON-8 (DSG) package with LARGE T&R packing and a package quantity of 3000. Lifecycle status does not indicate HKEQGOO stock, lead time, MOQ, or final availability.
