Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Input | 1.62 V to 5.5 V |
| Load Class | 100 mA-class current-limited load-switch variant |
| On-Resistance | Approximately 0.4 Ω at 5.5 V / 0.5 Ω at 3.3 V family behavior |
| Protection | Current limiting, thermal shutdown and UVLO |
| Control | Active-high enable |
| Fault Behavior | Blanking/auto-restart family protection behavior |
| Shutdown | Less than 1 µA stated family shutdown current |
| Exact Package / Packing | SC70 (DCK), 5 pins; 3000-piece large reel; markings 4EJ/4EN |
Product Overview
TPS22945DCKR is not intended as a multi-amp rail switch. It belongs to a protected low-current family whose value is keeping a small sensor/peripheral branch from pulling excessive current from a shared low-voltage supply.
The higher on-resistance is acceptable at a 100-mA-class load, while integrated current limiting and thermal shutdown provide protection that a lower-RON unprotected switch would not.
Fault blanking and restart behavior matter when the load has startup transients: the system should distinguish a legitimate capacitive/inrush event from a persistent overload.
For related devices, see HKEQGOO’s Power Distribution Switches, Load Drivers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TPS22945DCKR |
| Input | 1.62 V to 5.5 V |
| Load Class | 100 mA-class current-limited load-switch variant |
| On-Resistance | Approximately 0.4 Ω at 5.5 V / 0.5 Ω at 3.3 V family behavior |
| Protection | Current limiting, thermal shutdown and UVLO |
| Control | Active-high enable |
| Fault Behavior | Blanking/auto-restart family protection behavior |
| Shutdown | Less than 1 µA stated family shutdown current |
| Exact Package / Packing | SC70 (DCK), 5 pins; 3000-piece large reel; markings 4EJ/4EN |
| Manufacturer Status | Active / Production |
| Part Marking | 4EJ / 4EN |
Functional Highlights
Low-current limiting can isolate fragile branches
A small peripheral fault can be contained locally without sizing the upstream regulator/fuse around every branch.
Blanking reduces nuisance reaction to brief startup current
Short transients can be tolerated while sustained overloads still invoke protection.
Design Considerations
- Do not use this 100-mA-class device as a substitute for ampere-class TPS22918/22975 load switches.
- Check normal startup current against the exact limit/blanking timing.
- Include ~0.5-Ω-class RON in voltage-drop calculations at low VIN.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TPS22945DCKR as Active / Production; SC70 (DCK), 5 pins; 3000-piece large tape and reel; markings 4EJ/4EN.
Related Engineering Resources
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