LTC4352 - Low Voltage Ideal Diode Controller with Monitoring

The LTC4352 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 and board area. The ideal diode function permits low loss power 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 ﬂags excessive voltage drop across the pass transistor in the on state. A REV pin enables reverse current, overriding the diode behavior when desired.

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

Typical Application

Applications

Redundant Power Supplies
Supply Holdup
Telecom Infrastructure
Computer Systems and Servers

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC4352CDD#PBF	3x3 DFN-12	C	$3.57	$2.50
LTC4352CDD#TRPBF	3x3 DFN-12	C		$2.56
LTC4352CMS#PBF	MS-12	C	$3.57	$2.50
LTC4352CMS#TRPBF	MS-12	C		$2.56
LTC4352HDD#PBF	3x3 DFN-12	H	$4.77	$3.34
LTC4352HDD#TRPBF	3x3 DFN-12	H		$3.40
LTC4352HMS#PBF	MS-12	H	$4.77	$3.34
LTC4352HMS#TRPBF	MS-12	H		$3.40
LTC4352IDD#PBF	3x3 DFN-12	I	$4.14	$2.90
LTC4352IDD#TRPBF	3x3 DFN-12	I		$2.96
LTC4352IMS#PBF	MS-12	I	$4.14	$2.90
LTC4352IMS#TRPBF	MS-12	I		$2.96