Analog Devices / Maxim Integrated MAX16550 Integrated Protection ICs
Analog Devices Inc. MAX16550 Integrated Protection ICs come with an integrated low-resistance MOSFET and lossless current-sense circuitry featuring SMBus/PMBus™ control and reporting. The ICs are designed to provide the optimum solution for distribution, control, monitoring, and protection of the system’s 12V power supply. An internal LDO provides the supply voltage for the protection IC. If no fault is detected, the ICs initiate the startup and have been designed to provide a controlled, monotonic startup. Programmable soft-start ramp and delay are implemented to limit the in-rush current during startup.
The ICs monitor the current and voltage of the 12V system power rail and provide multiple levels of protection with fast turn-off if a fault is detected. ADI’s patented, lossless current sense provides high-accuracy current sensing of overload and temperature, improving overall system energy efficiency and reducing dissipation.
The output voltage is monitored at all times. If at any time the output voltage falls below the programmable output under-voltage-lockout threshold, the PWRGD signal is asserted low. If at any time the input voltage falls below the programmable input under-voltage-lockout threshold, the PWRGD signal is asserted low. The ICs can be programmed through PMBus to provide input overvoltage protection. Input overvoltage protection is disabled by default. When enabled through PMBus, if the input voltage exceeds a programmable overvoltage threshold, the MOSFET is latched off and a fault indicated.
Features
- MAX16550 with 30A protection with 8A startup
- High-density (4mmx4.5mm for 30A): less than 25% of the board area of conventional solutions
- Monolithic integration of power, control, and monitoring
- Integrated power MOSFET with 1.9mΩ total resistance in 12V power path (RDS(ON) including package)
- Integrated lossless, precise current sensing
- Integrated LDO provides a VDD supply (1.8V bias supply)
- Programmable soft-start and delay
- Programmable input undervoltage-lockout threshold (UVLO)
- Programmable power-good threshold
- PWRGD pin for output UVLO/input UVLO reporting
- FAULT pin for fault reporting
- Enables advanced system power management—PMBus/SMBus telemetry with extensive status monitoring and reporting
- The load current indicator (ILOAD) pin provides an analog output current reporting with high accuracy
- Programmable soft-start for inrush current limiting
- Increases power-supply reliability with IC self-protection features
- Very fast fault detection and isolation
- VIN to VOUT short protection during startup
- Overtemperature protection
- Three levels of overcurrent protection
- Programmable moderate OCP
- Programmable severe OCP provides isolation < 5μs
- Fail-safe OCP provides isolation < 250ns
Applications
- Servers, networking, storage, communication equipment, and AC/DC power supplies
- Integrated protection IC on 12V
- Circuit breaker/E-fuse, Hot Swap
- 240VA
Block Diagram
Related Products
Analog Devices / Maxim Integrated MAX16550B Integrated Protection IC
Features an integrated low-resistance MOSFET and lossless current-sense circuitry with SMBus/PMBus™.