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Datasheets:
ACS761: 12 V High-Side Hot-Swap Hall Effect Based Current Monitor (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Current Sensor ICs
Technical Publications:
Allegro Hall-Effect Based Current Sensor ICs
Press Releases:
ACS761: Allegro MicroSystems, Inc. Announces New 12 V Hot Swap Controller
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ACS761ELF-20B-T
12 V High-Side Hot-Swap Hall Effect Based Current Monitor
Features
- Hall-effect current monitor—no external sense resistor required
- PGOOD and PGOOD indication
- Analog output voltage (factory trimmed for gain and offset) proportional to applied current
- External high-side FET gate drive
- 240V*A power fault protection with user-selectable delay
- Overcurrent fault protection with user-selectable delay
- Fault protection isolates failed supply from output in <2 µs
- 1.5 mΩ internal conductor resistance
- Active low latched Fault indicator output signal
- User controlled soft start / hot-swap function
- Logic enable input pin
- 10.8 to 13.2 V, single-supply operation
- 2 kV ESD protection for all pins
Description
The ACS761 combines Allegro® Hall-effect current sense technology with a hot-swap controller resulting in a more efficient integrated controller for 12 V applications. By eliminating the need for a shunt resistor, the I2R losses in the power path are reduced.
When the ACS761 is externally enabled, and the voltage rail is above the internal UVLO threshold, the internal charge pump drives the gate of the external FET. When the load voltage reaches its target value PGOOD is asserted high. When a fault is detected, the gate is disabled while simultaneously alerting the application that a fault has occurred.
The integrated protection in the ACS761 incorporates three levels of fault protection, which includes a Power Fault with user-selectable delay, an Overcurrent Fault threshold with userselectable delay, and Short Circuit protection, which disables the gate in less than 2 µs. These faults are indicated to the host system via the Fault pin and are cleared upon reasserting enable high.
Minimum Order Value: Estimated annual volume must be > 100,000 units
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| ACS761ELFTR-20B-T | 24-lead QSOP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.