MAX4945
PRODUCTIONOvervoltage-Protection Controllers with Internal FET
Provide Input Voltage Protection Up to +28V without Requiring an External nFET
- Part Models
- 4
- 1ku List Price
- Starting From $4.58
Overview
- Input Voltage Protection Up to +28V
- Integrated nFET Switch
- Preset Overvoltage Protection Trip Level
- 7.40V (MAX4943)
- 6.35V (MAX4944_)
- 5.80V (MAX4945_)
- 4.56V (MAX4946)
- 8.90V (MAX4949)
- Low-Current Undervoltage-Lockout Mode
- Short-Circuit Protection (Latchoff/Autoretry)
- Internal 15ms (typ) Startup Delay and Retry Times
- Input Voltage Power-Good Logic Output
- Thermal-Shutdown Protection
- Small, 8-Pin (2mm x 2mm) µDFN Package
The MAX4943–MAX4946/MAX4949 family of overvoltage-protection devices feature a low 80mΩ (typ) RON internal FET and protect low-voltage systems against voltage faults up to +28V. These devices also drive an optional external pFET to protect down to -28V when connected to a load with reverse current protection. When the input voltage exceeds the overvoltage threshold, the internal FET is turned off to prevent damage to the protected components.
All switches feature a minimum 1.2A current-limit protection. During a short-circuit occurrence, the MAX4944B and MAX4945B place the switch in a latchoff state where the switch turns off and remains off. For the autoretry devices, the switch turns off and continuously checks after a 15ms (typ) retry time.
The overvoltage thresholds (OVLO) are preset to 7.4V, 6.35V, 5.8V, 4.56V, or 8.9V. The undervoltage-lockout (UVLO) thresholds are preset to 2.45V and 4.15V. When the input voltage drops below the undervoltagelockout (UVLO) threshold, the devices enter a lowcurrent standby mode. (See the Ordering Information/Selector Guide in the full data sheet for more details on UVLO/OVLO).
All devices are offered in a small, 8-pin µDFN (2mm x 2mm) package and are specified for operation over the -40°C to +85°C temperature range.
Applications
- Cell Phones
- Digital Still Cameras
- MP3 Players
- PDAs and Palmtop Devices
Documentation
Data Sheet 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX4945AELA+ | LFCSP | ||
| MAX4945AELA+T | LFCSP | ||
| MAX4945LELA+ | 8-LFCSP-2X2X0.75 | ||
| MAX4945LELA+T | LFCSP |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Overvoltage & Overcurrent Protectors 3 | ||
| MAX4843 | Obsolete | Overvoltage Protection Controllers with Low Standby Current |
| MAX4845 | PRODUCTION | Overvoltage Protection Controllers with Low Standby Current |
| MAX4846 | Obsolete | Overvoltage Protection Controllers with Low Standby Current |
| Protection Switches & Controllers 1 | ||
| MAX4844 | Overvoltage Protection Controllers with Low Standby Current | |
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