Electromagnetic Interfere (EMI) is often a challenge for system designers particularly for applications such as automotive, industrial and communications systems with stringent CISPR compliance.
This requires additional EMI filters to the existing circuitry, cost to PCB revision and delay time to market in order to pass the CISPR EMI compliance. The LT865xS family allows designs to simplify PCB design, reduce design cycle time and meeting CISPR EMI compliance with Silent Switcher 2 Architecture while maintaining high efficiency performance across load range in a compact solution.
The LT8652S, from Analog Devices, is a dual step-down regulator that delivers up to 8.5A of continuous current from both channels and supports loads up to 12A from each channel. The LT8652S uses second generation Silent Switcher technology including integrated bypass capacitors to deliver a high frequency, high efficiency, small solution with excellent EMI performance. The LT8652S is ideal for noise sensitive applications such as PLLs and high bandwidth data and communications systems.
The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, enabling a wide control loop bandwidth for fast transient response. Output current monitoring and limiting allows inductors to be selected for the maximum output current in a given application. Differential output voltage sensing provides accurate voltage regulation at the point of load for high current applications. The two channels can be combined to deliver 17A, and two LT8652S ICs can be combined for a 4-phase, 34A supply.
Silent Switcher® 2 Architecture:
- • Reduces radiated EMI on any PCB
- • Eliminates PCB layout sensitivity
- • Internal Bypass Capacitors reduce radiated EMI
- • Spread Spectrum Frequency Modulation
The LT8653S is a dual step-down regulator that delivers up to 2A of continuous current from both channels and supports loads up to 3A from each channel. The LT8653S features the second generation Silent Switcher architecture to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes integration of bypass capacitors to optimize high frequency current loops and make it easy to achieve advertised EMI performance by eliminating layout sensitivity.
The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small solution size with wide control loop bandwidth for fast transient response. Burst Mode operation enables ultralow standby current consumption or forced continuous mode can be used to control frequency harmonics across the entire output load range. The LT8653S is a full featured, customizable voltage regulator, but also has several pin strap options to select internal 2MHz switching frequency, internal compensation and internal feedback resistor divider options to create a simple, compact two output voltage regulator with only five external components.
Applications:
- General Purpose Step-Down
- Automotive and Industrial Supplies
Key Features and Benefits
- • Silent Switcher 2 architecture: Internal Bypass Capacitors reduce radiated EMI
- • Ultra Low Quiescent Current Burst Mode Operation: High efficiency at light load and minimize low output Ripple Voltage (10mVpp)
- • Small 4x7mm 36 pin LQFN with dual 8.5A output or 17A combined (LT8652S) or
- • Small 4x3mm 20 pin LQFN with dual 2A output or 4A combined (LT8653S)
Applications
- • Communications: Communication infrastructure applications
- • General Purpose: point of load for server and core power
- • Industrial Automation: Building and machine automation
Block Diagrams and Tables
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