Overview
The LTC4365ITS8#TRMPBF, manufactured by Analog Devices Inc., is a highly versatile overvoltage, undervoltage, and reverse supply protection controller. This device is designed to protect applications from power supply input voltages that may be too high, too low, or even negative. It achieves this by controlling the gate voltages of a pair of external N-channel MOSFETs, ensuring the output stays within a safe operating range.
The LTC4365 is particularly useful in environments where power supply stability is critical, such as in automotive, industrial automation, and portable instrumentation applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN Input Voltage Range | Operating Range | 2.5 | - | 34 | V |
| VIN Input Voltage Range | Protection Range | -40 | - | 60 | V |
| IVIN Input Supply Current | SHDN = 0V, VIN = VOUT, -40°C to 85°C | 10 | 125 | 150 | µA |
| ISHDN SHDN Input Current | SHDN = 0.75V, VIN = 34V | ±10 | - | - | nA |
| VUV UV Input Threshold Voltage | UV Falling → ΔVGATE = 0V | 492.5 | 500 | 507.5 | mV |
| VOV OV Input Threshold Voltage | OV Rising → ΔVGATE = 0V | 492.5 | 500 | 507.5 | mV |
| tFAULT UV, OV Fault Propagation Delay | Overdrive = 50mV, VIN = VOUT = 12V | 1 | 2 | - | µs |
| tSTART Delay Coming Out of Shutdown Mode | SHDN Rising to ΔVGATE > 0V, VIN = VOUT = 12V | 400 | 800 | 1200 | µs |
Key Features
- Wide Operating Voltage Range: 2.5V to 34V, with protection up to 60V and reverse protection to -40V.
- Adjustable Undervoltage and Overvoltage Protection: Configurable using an external resistive divider.
- Charge Pump Enhancement: Enhances the external N-channel MOSFET.
- Low Operating Current: 125µA in normal operation and 10µA in shutdown mode.
- Compact Packaging: Available in 8-lead, 3mm × 2mm DFN and TSOT-23 packages.
- No Input Capacitor or TVS Required: For most applications.
- Fast Recovery from Fault: The LTC4365-1 version has a fast (1ms) recovery from fault.
- AEC-Q100 Qualified for Automotive Applications: Suitable for use in automotive environments.
Applications
- Automotive Systems: Protects against voltage surges and reverse polarity in automotive applications.
- Industrial Automation: Ensures stable power supply in industrial automation systems.
- Portable Instrumentation: Protects portable devices from voltage fluctuations.
- Laptops and Other Mobile Devices: Provides overvoltage and undervoltage protection for mobile electronics.
Q & A
- What is the operating voltage range of the LTC4365?
The operating voltage range of the LTC4365 is from 2.5V to 34V, with protection up to 60V and reverse protection to -40V.
- How does the LTC4365 protect against overvoltage and undervoltage?
The LTC4365 protects against overvoltage and undervoltage by controlling the gate voltages of external N-channel MOSFETs, using adjustable thresholds set by an external resistive divider.
- What is the typical operating current of the LTC4365?
The typical operating current of the LTC4365 is 125µA, and it reduces to 10µA in shutdown mode.
- Does the LTC4365 require an input capacitor or TVS for most applications?
No, the LTC4365 does not require an input capacitor or TVS for most applications).
- What is the recovery time from fault for the LTC4365-1 version?
The LTC4365-1 version has a fast recovery time of 1ms from fault).
- Is the LTC4365 suitable for automotive applications?
Yes, the LTC4365 is AEC-Q100 qualified for automotive applications).
- What are the available package types for the LTC4365?
The LTC4365 is available in 8-lead, 3mm × 2mm DFN and TSOT-23 packages).
- How does the charge pump in the LTC4365 enhance the external MOSFET?
The charge pump in the LTC4365 enhances the external N-channel MOSFET by providing the necessary gate voltage to ensure proper operation).
- What is the purpose of the shutdown pin in the LTC4365?
The shutdown pin provides external control for enabling and disabling the MOSFETs and placing the device in a low current shutdown state).
- Does the LTC4365 block AC power?
Yes, the LTC4365 blocks 50Hz and 60Hz AC power).
