LTC4352CMS-PBF Integrated Circuit Chip Low Voltage Ideal Diode Controller with Monitoring

FEATURES

♦ Low Loss Replacement for Power Diode

♦ Controls N-Channel MOSFET

♦ 0V to 18V Supply ORing or Holdup

♦ 0.5μs Turn-On and Turn-Off Time

♦ Undervoltage and Overvoltage Protection

♦ Open MOSFET Detect

♦ Status and Fault Outputs

♦ Hot Swappable

♦ Reverse Current Enable Input

♦ 12-Pin MSOP and DFN (3mm × 3mm) Packages

APPLICATIONS

♦ Redundant Power Supplies

♦ Supply Holdup

♦ Telecom Infrastructure

♦ Computer Systems and Servers

DESCRIPTION

The LTC®4352 creates a near-ideal diode using an external N-channel MOSFET. It replaces a high power Schottky diode and the associated heat sink, saving power andboard area. The ideal diode function permits low losspower ORing and supply holdup applications.

The LTC4352 regulates the forward voltage drop across the MOSFET to ensure smooth current

transfer in diode-OR applications. A fast turn-on reduces the load voltage droop during supply

switch-over. If the input supply fails or is shorted, a fast turn-off minimizes reverse currents.

The controller operates with supplies from 2.9V to 18V.

For lower voltages, an external supply is needed at the VCC pin. Power passage is disabled during undervoltage or overvoltage conditions.

The controller also features an open MOSFET detect circuit

that fl ags excessive voltage drop across the pass transistor in the on state. A REV pin enables reverse current, overriding the diode behavior when desired.

PIN CONFIGURATION

TYPICAL APPLICATION