DESCRIPTION

The SMH4044 is a fully integrated hot swap controller that provides complete power control for add-in cards ranging in use for basic hot swap systems to high availability systems. It detects proper insertion of the card and senses valid supply voltage levels at the backplane. Utilizing external low on-resistance N-channel MOS FETs, card power is ramped by two high-side driver outputs that are slew-rate limited at 250V/s.

The SMH4044 continuously monitors the host supplies, the add-in card supplies and the add-in card currents. If the SMH4044 detects the current is higher than the programmed value it will shut down the MOSFETs and issue a fault status to the host.

FEATURES

• IPMI Implementation

♦ IPMB Interface

♦ Software Controlled Power-Up/-Down

♦ Status Reporting: 5V, 3.3V, V1, V2, Healthy, Signal Valid, Reset

♦ 2k-Bit E2PROM Memory

• Full Voltage Control for Hot Swap Applications

♦ Detect, Monitors and Controls up to 4 inde pendent supplies

• 14V High Side Driver Generation Allows use of Low On Resistance N-Channel FETs

• Under-Voltage Lockout

• Electronic Circuit Breakers

♦ Programmable Over-current Levels

• Card Insertion Detection

• Card Voltage Sequencing

• Flexible Reset Control

♦ Low Voltage Resets

♦ Host Reset Filtering

♦ Soft Reset

• Adjustable Power On Slew Rate