LT8648S
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LT8648S

42V, 15A Synchronous Step-Down Silent Switcher 2

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 11
1ku List Price Starting From $6.47
Features
  • Silent Switcher®2 Architecture
    • Ultralow EMI Emissions on Any PCB
    • Eliminates PCB Layout Sensitivity
    • Internal Bypass Capacitors Reduce Radiated EMI
    • Optional Spread Spectrum Modulation
  • High Efficiency at High Frequency
    • Up to 95.5% Efficiency at 1MHz, 12VIN to 5VOUT
    • Up to 93% Efficiency at 2MHz, 12VIN to 5VOUT
  • Low Quiescent Current Burst Mode® Operation
    • 100μA IQ Regulating 12VIN to 5VOUT
    • Output Ripple < 10mVP-P
  • Wide Input Voltage Range: 3V to 42V
  • 15A Output Current
  • External Compensation: Fast Transient Response and Current Sharing
  • Fast Minimum Switch On-Time: 25ns
  • Low Dropout Under All Conditions: 35mV at 1A
  • Forced Continuous Mode
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Output Soft-Start and Power Good
  • Safely Tolerates High Reverse Current
  • Small 36-Lead 7mm × 4mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
show more Icon

The LT8648S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of input and boost capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8648S ideal for noise sensitive applications and environments.

The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 25ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VC pin allows for fast transient response at high switching frequencies. The VC pin also enables current sharing and a CLKOUT pin enables synchronizing other regulators to the LT8648S.

Burst Mode operation enables low standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. Soft-start and tracking functionality is accessed via the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.

APPLICATIONS

  • Automotive and Industrial Supplies
  • General Purpose Step-Down

All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 8823345.
Part Models 11
1ku List Price Starting From $6.47

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8648SEV#PBF
  • HTML
  • HTML
LT8648SEV#TRPBF
  • HTML
  • HTML
LT8648SEV#WPBF
  • HTML
  • HTML
LT8648SEV#WTRPBF
  • HTML
  • HTML
LT8648SHV#PBF
  • HTML
  • HTML
LT8648SHV#WPBF
  • HTML
  • HTML
LT8648SHV#WTRPBF
  • HTML
  • HTML
LT8648SJV#PBF
  • HTML
  • HTML
LT8648SJV#TRPBF
  • HTML
  • HTML
LT8648SJV#WPBF
  • HTML
  • HTML
LT8648SJV#WTRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Mar 6, 2024

- 23_0287

Notification of Qualification on SMT Paste, and Die Thickness Change for LT8648S

LT8648SEV#PBF

PRODUCTION

LT8648SEV#TRPBF

PRODUCTION

LT8648SEV#WPBF

PRODUCTION

LT8648SEV#WTRPBF

PRODUCTION

LT8648SHV#PBF

PRODUCTION

LT8648SHV#WPBF

PRODUCTION

LT8648SHV#WTRPBF

PRODUCTION

LT8648SJV#PBF

PRODUCTION

LT8648SJV#TRPBF

PRODUCTION

LT8648SJV#WPBF

PRODUCTION

LT8648SJV#WTRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Mar 6, 2024

- 23_0287

arrow down

Notification of Qualification on SMT Paste, and Die Thickness Change for LT8648S

LT8648SEV#PBF

PRODUCTION

LT8648SEV#TRPBF

PRODUCTION

LT8648SEV#WPBF

PRODUCTION

LT8648SEV#WTRPBF

PRODUCTION

LT8648SHV#PBF

PRODUCTION

LT8648SHV#WPBF

PRODUCTION

LT8648SHV#WTRPBF

PRODUCTION

LT8648SJV#PBF

PRODUCTION

LT8648SJV#TRPBF

PRODUCTION

LT8648SJV#WPBF

PRODUCTION

LT8648SJV#WTRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC2841A

LT8648S Demo Board | 42V, 15A Synchronous Step-Down Silent Switcher 2

zoom

DC2841A

LT8648S Demo Board | 42V, 15A Synchronous Step-Down Silent Switcher 2

LT8648S Demo Board | 42V, 15A Synchronous Step-Down Silent Switcher 2

Product Detail

Demonstration Circuit 2841A is a 42V, 15A synchronous step-down Silent Switcher 2 with spread spectrum frequency modulation featuring the LT8648S. The demo board is designed for 5V output from a 5.7V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8648S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. The integrated bypass capacitors optimize the fast current loops and make it easier to minimize EMI emissions by reducing layout sensitivity. Selectable spread spectrum mode further improves EMI performance, making it perfect solution to the noise sensitive applications. 

Peak current mode control with minimum on-time of as small as 25ns allows high step-down conversion even at high frequency. The LT8648S switching frequency can be programmed either via oscillator resistor or external clock over a 200kHz to 2.2MHz range. The default frequency of demo circuit 2841A is 400kHz.

The SYNC/MODE pin on the demo board DC2841A is grounded (JP1 at BURST position) by default for low ripple Burst Mode® operation. It can be configured into different operation modes through JP1 and SYNC terminal (Table 1).

Figure 1 shows the efficiency of the circuit at 12V input and 24V input in force continuous mode without spread spectrum. To get accurate efficiency measurement, measure the input voltage at the VIN SENSE terminal and measure the output voltage at the VO SENSE terminal. 

Figure  2 shows the LT8648S temperature rising on DC2841A demo board under different load conditions. The LT8648S is assembled in a 7mm × 4mm LQFN package with exposed pads for low thermal resistance. The rated maximum load current is 15A, while derating is necessary for certain input voltage and thermal conditions.

The demo board has an EMI filter installed. The EMI performance of the board is shown on Figure 3. The red line in Radiated EMI Performance is CISPR25 Class 5 peak limit. The figure shows that the circuit passes the test with a wide margin. To achieve EMI performance as shown in Figure 3, the input EMI filter is required and the input voltage should be applied at VIN_EMI terminal, and the test setup can be referred to the CISPR25 standards. If the input is applied to VIN terminal, the EMI filter is bypassed. 

The LT8648S data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2841A. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout and Thermal Considerations and Peak Output Current. Contact ADI applications engineer for support.

reference details image

AD-JUPITER-EBZ

Software-Defined Radio

zoom

AD-JUPITER-EBZ

Software-Defined Radio

Software-Defined Radio

Features and Benefits

  • RF/SDR
    • ADRV9002 transceiver
    • 2 x receiver, 2 x transmitter
    • LO frequency range 30 MHz to 6 GHz
    • 12 kHz to 40 MHz frequency bandwidth
    • Sampling rate 12 kSPS to 61.44 MSPS
  • External Device Clock Input
  • External MCS Input
  • RF Front-end
  • Processing System
    • Zynq UltraScale+ MPSoC XCZU3EG
      • ARM Cortex-A53 1.5 GHz
      • ARM Cortex-R5 500 MHz
      • Mali-400 MP2 graphic processor
      • Programmable logic 154 k
    • DDR4 – 2 GB (x32)
    • Boot source
      • SD card 3.0
      • Flash memory 128 MB
    • User Interfaces
      • USB 3.1 Gen 1 – Type C
        • Upstream Facing Port (UFP)
        • Downstream Facing Port (DFP)
        • USB 2.0 compatible
    • Ethernet 1000BASE-T RGMII
    • Display Port v1.2 (2 lanes, 5.4 Gbps)
    • SATA 3
    • USB (micro) debug interface
    • 16 GPIOs (3V3 LVCMOS)
  • Power Sources
    • USB Type-C (power only)
      • Power Sink 5V, 9V/3A
    • USB Type-C (data)
      • Power Sink 5V/3A
      • Power Source 5V/0.9 A
    • 802.3at POE compliant, 25.5 W Type2 (POE+)

Product Detail

The AD-JUPITER-EBZ is a versatile software-defined platform based on Analog Devices ADRV9002 and Xilinx Zynq UltraScale+ MPSoC. The ADRV9002 is a new generation RF transceiver that has dual-channel transmitters, dual-channel receivers covering a frequency range of 30 MHz to 6 GHz. This device has a high-quality RF linearity performance and a set of advanced features like fast profiles switching, flexible power vs. performance configuration, fast frequency hopping, multi-chip synchronization, and digital pre-distortion (DPD) for narrow and wide band waveform.

The evaluation platform includes XCZU3EG processing device that has a wide range of interfaces, making the system capable of local processing or streaming to a remote host. It comes integrated in a self-contained ruggedized aluminum case, which gives flexibility in evaluating and prototyping across different environments.

APPLICATIONS

  • Aerospace and Defense
  • Communications
  • Advanced Education
Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Recently Viewed