LTC4359

Part: LTC4359IMS8#TRPBF — Analog Devices (Linear Technology)

Type: Ideal Diode Controller (N-channel MOSFET driver with reverse input protection)

Description: 4–80 V positive high-voltage ideal diode controller that drives an external N-channel MOSFET, regulates a 30 mV forward drop, and withstands reverse inputs to -40 V, with 150 μA operating current and 9 μA shutdown current.

Operating Conditions:

• Supply voltage: 4–80 V
• Operating temperature (LTC4359I grade): -40 to 85 °C
• Gate drive (GATE-SOURCE): 10–15 V for IN = 8 V to 80 V; 4.5–15 V at IN = 4 V

Absolute Maximum Ratings:

• IN, SOURCE, SHDN: -40 V to 100 V
• OUT: -2 V to 100 V
• IN - OUT: -100 V to 100 V
• IN - SOURCE: -1 V to 80 V
• GATE - SOURCE: -0.3 V to +10 V
• Storage temperature: -65 to 150 °C
• Lead temperature (soldering, 10 sec): 300 °C

Key Specs:

• IN current: 150 μA typ, 200 μA max (IN = 12 V, TA = 25 °C)
• IN current in shutdown: 9 μA typ, 20 μA max (IN = OUT = 12 V, SHDN = 0 V)
• Source-drain regulation voltage (ΔVSD): 20 / 30 / 45 mV min/typ/max
• Gate pull-up current: -10 μA typ (-6 to -14 μA)
• Gate pull-down current in fault: 130 mA typ (70 mA min, 180 mA max)
• Gate turn-off delay: 0.3 μs typ, 0.5 μs max (ΔVSD = 0.1 V to -1 V, CGATE = 0 pF)
• Gate turn-on delay: 200 μs typ (SHDN = 0 V to 2 V)
• SHDN threshold: 0.6 / 1.2 / 2 V min/typ/max

Features:

• Replaces a power Schottky diode to reduce power dissipation
• Reverse input protection to -40 V
• Smooth switchover without oscillation
• Controls single or back-to-back N-channel MOSFETs
• Shutdown mode with 9 μA supply current
• Fast gate turn-off minimizes reverse current transients
• AEC-Q100 qualified versions (#W ordering options)

Applications:

• Automotive battery protection
• Redundant power supplies
• Supply holdup
• Telecom infrastructure
• Computer systems/servers
• Solar systems

Package:

• 8-Lead Plastic MSOP (LTC4359IMS8)

• n Automotive Battery Protection
• n Redundant Power Supplies
• n Supply Holdup
• n Telecom Infrastructure
• n Computer Systems/Servers
• n Solar Systems

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25°C, IN = 12V, SOURCE = IN, unless otherwise noted.

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.

Note 2. All currents into pins are positive; all voltages are referenced to VSS unless otherwise specified.

Note 3. An internal clamp limits the OUT pin to a minimum of 100V above VSS . Driving this pin with more current than 1mA may damage the device.

Note 4. An internal clamp limits the GATE pin to a minimum of 10V above IN or 100V above V SS . Driving this pin to voltages beyond the clamp may damage the device.

(Notes 1, 2)

IN, SOURCE, SHDN

................................... -40V to 100V

OUT (Note 3) ................................................-2V to 100V

IN - OUT ..................................................-100V to 100V

IN - SOURCE .................................................-1V to 80V

GATE - SOURCE (Note 4) .........................-0.3V to +10V

12V, 20A Automotive Reverse-Battery Protection

The LTC ® 4359 is a positive high voltage ideal diode controller that drives an external N-channel MOSFET to replace a Schottky diode. It controls the forward-voltage drop across the MOSFET to ensure smooth current delivery without oscillation even at light loads. If a power source fails or is shorted, a fast turn-off minimizes reverse current transients. A shutdown mode is available to reduce the quiescent current to 9μA for load switch and 14μA for ideal diode applications.

When used in high current diode applications, the LTC4359 reduces power consumption, heat dissipation, voltage loss and PC board area. With its wide operating voltage range, the ability to withstand reverse input voltage, and high temperature rating, the LTC4359 satisfies the demanding requirements of both automotive and telecom applications. The LTC4359 also easily ORs power sources in systems with redundant supplies.

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