MAX4945, MAX4945L：Overvoltage-Protection Controllers with Internal FET
Provide Input Voltage Protection Up to +28V without Requiring an External nFET
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.
Key Features
| MAX4943, MAX4944, MAX4944L, MAX4945, MAX4946, MAX4949: Typical Operating Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX4943-MAX4949 Data Sheet | MAX4943-MAX4949.pdf |
Parametrics
| Part Number | Channels | VIN (V) | VIN (V) | Over Voltage Trip Level (V) | Under Voltage Lockout (V) | Over Volt. Flag | tGATE (On) (ms) | tGATE (Off) (µs) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|
| min | max | See Notes | ||||||||
| MAX4944 | 1 | 2.2 | 28 | 6.35 | 4.15 | Open-Drain | 30.2 | 2 | µDFN/8 | $2.75 @1k |
| MAX4945 | 5.8 | 4.15 | µDFN/8 | $2.76 @1k | ||||||
| MAX4946 | 4.56 | 2.45 | µDFN/8 | - | ||||||
| MAX4949 | 8.9 | 2.45 | µDFN/8 | - | ||||||
Related Products
- MAX4846：Overvoltage Protection Controllers with Low Standby Current
- MAX4844：Overvoltage Protection Controllers with Low Standby Current
- MAX4845：Overvoltage Protection Controllers with Low Standby Current
- MAX4843：Overvoltage Protection Controllers with Low Standby Current
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX4945AELA+ | Active | µDFN,;8 pin;4.2 mm² | -40°C to +85°C | Lead Free | |
| MAX4945AELA+T | Active | µDFN,;8 pin;4.2 mm² | -40°C to +85°C | Lead Free | |
| MAX4945BELA+T | No Longer Available | uDFN; | -40°C to +85°C | See data sheet | |
| MAX4945ELA+ | Active | µDFN,;8 pin;4.2 mm² | -40°C to +85°C | Lead Free | |
| MAX4945ELA+T | Active | µDFN,;8 pin;4.2 mm² | -40°C to +85°C | Lead Free | |
| MAX4945LELA+ | Active | µDFN,;8 pin;4.2 mm² | -40°C to +85°C | Lead Free | |
| MAX4945LELA+T | Active | µDFN,;8 pin;4.2 mm² | -40°C to +85°C | Lead Free |
- MAX4943-MAX4949.pdf MAX4949
- MAX4943-MAX4949_cn.pdf MAX4949
- MAX4943-MAX4949_cn.pdf MAX4943
