Overview
The LT8648SJV#PBF is a high-performance synchronous step-down regulator from Analog Devices, featuring the second-generation Silent Switcher 2 architecture. This regulator is designed to minimize EMI emissions while delivering high efficiency and fast transient response. It is capable of handling input voltages up to 42V and can deliver output currents of up to 15A. The device is available in various temperature ranges, including –40°C to 125°C for the SE version and –40°C to 150°C for the JV and HV versions.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Minimum Input Voltage | fSW = 400kHz | 2.45 | 2.75 | 3.0 | V |
| Quiescent Current in Shutdown | VEN/UV = 0V, VIN = 12V | 6 | 9 | µA | |
| Quiescent Current in Sleep | VEN/UV = 2V, VFB > 0.6V, VSYNC = 0V | µA | |||
| Spread Spectrum Modulation Frequency | kHz | ||||
| Operating Junction Temperature Range | –40°C to 125°C (SE) | –40°C to 150°C (JV, HV) | °C | ||
| Maximum Reflow (Package Body) Temperature | 260 | °C |
Key Features
- Silent Switcher 2 Architecture: Minimizes EMI emissions on any PCB layout.
- High Efficiency: Delivers high efficiency even at high switching frequencies.
- Fast Transient Response: External compensation via the VC pin allows for fast transient response.
- Current Sharing and Synchronization: Enables current sharing and synchronization with other regulators via the CLKOUT pin.
- Low Standby Current: Burst Mode operation for low standby current consumption.
- Spread Spectrum Modulation: Reduces EMI emissions further.
- Soft-Start and Tracking: Soft-start and tracking functionality accessed via the SS pin.
- Input Voltage UVLO Threshold: Accurate input voltage UVLO threshold set using the EN/UV pin.
- Protection Features: Includes shorted and reversed input protection, and thermal shutdown.
Applications
The LT8648SJV#PBF is suitable for a variety of applications requiring high efficiency and low EMI, such as:
- Automotive Systems: Especially for models designated with the #W suffix, which are designed to support the quality and reliability requirements of automotive applications.
- Industrial Power Supplies: Where high current and high efficiency are critical.
- Telecommunications Equipment: For power supply modules that need to minimize EMI.
- Server and Data Center Power Supplies: To achieve high efficiency and reliability.
Q & A
- What is the maximum input voltage for the LT8648SJV#PBF?
The maximum input voltage is 42V.
- What is the typical output current of the LT8648SJV#PBF?
The typical output current is up to 15A.
- What is the Silent Switcher 2 architecture?
The Silent Switcher 2 architecture is designed to minimize EMI emissions on any PCB layout.
- How does the LT8648SJV#PBF handle soft-start and tracking?
Soft-start and tracking functionality are accessed via the SS pin, allowing the output voltage to ramp up gradually and track an external voltage source.
- What protection features does the LT8648SJV#PBF include?
The device includes shorted and reversed input protection, thermal shutdown, and other fault protection mechanisms.
- Can the LT8648SJV#PBF be used in automotive applications?
Yes, models designated with the #W suffix are designed to support the quality and reliability requirements of automotive applications.
- How does the spread spectrum modulation reduce EMI emissions?
The spread spectrum modulation spreads the switching frequency across a range, reducing the peak EMI emissions.
- What is the difference between LT8648SEV, LT8648SJV, and LT8648SHV?
The main difference is in the operating temperature range: LT8648SEV operates from –40°C to 125°C, while LT8648SJV and LT8648SHV operate from –40°C to 150°C.
- Can multiple LT8648S devices be paralleled to increase output current?
Yes, two LT8648S devices can be connected in parallel to increase the output current up to 30A.
- What is the purpose of the CLKOUT pin?
The CLKOUT pin enables synchronizing other regulators to the LT8648S, ensuring they operate at the same frequency.
