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Introducing Dual Channel Synchronous Step-Down Silent Switcher 2 with Very Low Quiescent Current from Analog Devices, samples and evaluation board available from Anglia

Date Published : 15/02/2021 Share with:

The LT8653S and LT8652S families from Analog Devices are dual step-down regulators that deliver up to 2A or 8.5A of continuous current from both channels and support loads up to 3A or 12A from each channel respectively. Both families use Analog Devices proprietary 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 LT8653S and LT8652S families feature fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small solution size with a wide control loop bandwidth for fast transient response.

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.

LT8652S has output current monitoring and limiting allowing 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 of the LT8652S can be combined to deliver 17A, and two ICs can be combined for a 4-phase, 34A supply. The LT8652S family is particularly ideal for noise sensitive applications such as PLLs and high bandwidth data and communications systems.

Both families feature a Burst Mode operation enabling ultralow standby current consumption or forced continuous mode can be used to control frequency harmonics across the entire output load range.

The LT8653S and LT8652S are supported by the DC2535A and DC2523A demonstration circuits respectively. Demonstration circuit DC2535A is a 42V, dual channel, 2A synchronous step-down regulator featuring the LT8653S. The demo board is designed for two outputs: 5V and 3.3V from a 5.5V to 42V input. Each output can source up to 2A continuous current at the same time. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The integrated power switches and other necessary circuitry reduce the external component count and simplify design. Selectable spread spectrum mode of operation can further improve EMI/EMC performance. Ultralow quiescent current in Burst Mode® operation achieves high efficiency at very light loads.
Demonstration circuit DC2523A is an 18V, 8.5A (continuous)/12A (peak) synchronous step-down Silent Switcher® with 16µA quiescent current featuring the LT8652S. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8652S to minimize external components and simplify design. The demo board has two outputs: 3.3V and 1.2V from a 3.6V to 18V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies.

The LT8653S and LT8652S families can be used in a wide range of applications such as General Purpose Step-Down regulators, Server Power, Automotive and Industrial Power Supplies.

Features

  • Silent Switcher®2 Architecture:
    • Ultralow EMI on Any PCB
    • Eliminates PCB Layout Sensitivity
    • Internal Bypass Capacitors Reduce Radiated EMI
    • Optional Spread Spectrum Frequency Modulation
  • 2A (LT8653S) and 8.5A (LT8652S) DC from Each Channel Simultaneously
  • Up to 3A (LT8653S) and 12A (LT8653S) on Either Channel
  • Ultralow Quiescent Current Burst Mode® Operation:
    • 6.2μA IQ Regulating 12VIN to 5VOUT1 and 3.3VOUT2 (LT8653S)
    • 16µA IQ Regulating 12VIN to 3.3VOUT (Both Channels) (LT8652S)
    • Output Ripple <10mVP-P
  • ±1.2% 600mV Feedback Voltage with Remote Sense
  • Optional External VC Pin: Fast Transient Response (LT8653S)
  • Output Current Monitor Pins with Current Limiting (LT8652S)
  • Forced Continuous Mode
  • CLKOUT for Up to 4-Phase Operation
  • 94.1% Efficiency at 1A, 5VOUT from 12VIN at 2MHz (LT8653S)
  • 93.6% Efficiency at 6A, 3.3VOUT from 12VIN at 1MHz (LT8652S)
  • 85.6% Efficiency at 6A, 1.0VOUT from 12VIN at 1MHz (LT8652S)
  • Fast Minimum Switch-On Time: 30ns (LT8653S) and 20ns (LT8652S)
  • Adjustable and Synchronizable: 300kHz to 3MHz
  • Small 4mm × 3mm 20-Pin LQFN Package (LT8653S) and 4mm × 7mm 36-Pin LQFN Package (LT8652S)
  • AEC-Q100 Qualification for Automotive Applications in Progress

 

Click here for more information or to buy from Anglia Live.

Click here to download the LT8653S Datasheet

Click here to download the DC2523A Eval Kit manual

Click here to download the LT8652S Datasheet

Click here to download the DC2535A Eval Kit manual

Anglia are offering customers FREE samples and an evaluation kit for the LTC8653S and LT8652S very low quiescent current synchronous step-down regulators from Analog Device, please fill in the form below to register for your FREE samples and evaluation kit now.

 

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FREE samples for UK and Ireland customers only, subject to availability.

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