MAX17614 Ideal Diodes/Power Source Selector Device

Featured Product from DigiKey

More Info Email Supplier Request a Quote

ADI's MAX17614 ideal diode/power source selector device offers adjustable protection boundaries for systems against positive and negative input faults up to +60 V and -65 V and output load current up to 3 A. The device features two internal nFETs connected in series with a low cumulative RON of 130 mΩ (typ) and can be used to implement an ideal diode function to provide reverse input voltage and reverse current protection with improved system efficiency. Input undervoltage (UV) protection can be programmed between 4.5 V and 59 V. In comparison, the overvoltage (OV) protection can be independently programmed between 5.5 V and 60 V. Additionally, the device has an internal default undervoltage lockout (UVLO) rising threshold set at 4.2 V (typ).

The device is enabled or disabled through the EN pin by a main supervisory system, offering a switch operation to turn on or turn off power delivery to connected loads.

The current through the device is limited by setting a current limit between 0.15 A to 3 A programmed by a resistor connected from SETI to GND. When the device current reaches or exceeds the set current limit, the internal nFET Q2 is controlled to limit the current to the set limit. The device offers three current-limit modes: autoretry, continuous, and latch-off. The SETI pin also presents a voltage with reference to GND, which, under normal operation, is proportional to the device current. The voltage appearing on the SETI pin might be read by an analog-to-digital converter (ADC) in a monitoring system for recording instantaneous device current. The device offers FLAG and UVOV communication signals to indicate different operational and fault signals. The communication signal pins are open drain in nature and require external pull-up resistors to appropriate system interface voltage.

The device offers FLAG and UVOV communication signals to indicate different operational and fault signals. The communication signal pins are open drain in nature and require external pull-up resistors to appropriate system interface voltage.

The device offers internal thermal shutdown protection against excessive power dissipation.

The MAX17614EVKIT# evaluation kit (EV kit) is a fully assembled and tested circuit board demonstrating the MAX17614 ideal diode/power source selector in a 20-pin TQFN-EP package. The EV kit allows two power sources to be connected as inputs. The load gets power from the higher voltage power source for ideal diode applications. For power source selector applications, the load gets power from either of the two power sources by driving respective EN pins. The EV kit configurations allow independent settings for the two instances to demonstrate adjustable overvoltage, undervoltage, reverse current blocking, and three current-limit types (autoretry, continuous, and latch-off) with different programmable current-limit thresholds (from 0.15 A to 3 A). For more details about the IC benefits and features, refer to the MAX17614 IC datasheet.

Features and Benefits

  • Ideal diode operation
    • Fast reverse current-blocking protection(140 ns)
    • Seamless power source switchover
  • Robust protection reduces system downtime
    • Wide input supply range: +4.5 V to +60 V
    • Hot plug-in tolerant without transient voltage suppressor (TVS) up to 35 V input supply
    • Negative input tolerance: -65 V
    • Low RON 130 mΩ (typ)
    • Thermal shutdown protection
    • Programmable startup blanking time
    • Extended -40°C to +125°C temperature range
  • Flexible design options enable reuse and less requalification
    • Adjustable input undervoltage lockout UVLO and overvoltage lockout (OVLO) thresholds
    • Programmable forward-current limit: 0.15 A to 0.3 A with +3.6% and -3.3% accuracy and 0.3 A to 3 A with ±3.3% accuracy over full temperature range
    • Programmable current limit fault response: autoretry, continuous, and latch-off modes
    • Built-in fault indication signals: UVOV and FLAG
  • Saves board space and reduces external BOM count
    • 20-pin, 4 mm x 4 mm, TQFN-EP package
    • Integrated back-to-back nFETs
  • Small total solution size
  • Faster response times
  • Tight current limit accuracy