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News
65V, 8A (IOUT), Synchronous Step-Down Silent Switcher 2 Delivers 94% Efficiency at 2MHz & Ultralow EMI/EMC Emissions
2017-04-25 | ReturnThe LT8645S’s synchronous rectification delivers efficiency as high as 94% with a switching frequency of 2MHz. Its 3.4V to 65V input voltage range is ideal for dual cell transportation, 48V automotive and industrial applications. The internal high efficiency switches can deliver up to 8A of continuous output current to voltages as low as 0.97V. The LT8645S’s Burst Mode® operation offers only 2.5µA of quiescent current, well suited for applications such as automotive/transportation always-on systems, which need to extend operating battery life. The LT8645S’s unique design maintains a minimum dropout voltage of only 60mV (at1A) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Furthermore, a fast minimum on-time of only 40ns enables 2MHz constant frequency switching from a 24V input to a 2.0V output, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands. The LT8645S’s 32-lead, 4mm x 6mm LQFN package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT8645S utilizes internal top and bottom high efficiency power switches with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Lowripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVP-P. For applications requiring the lowest noise operation, the LT8645S can be programmed to run in pulse-skipping mode. Its switching frequency is programmable and synchronizable from 200kHz to 2.2MHz. Special design techniques and a new high speed process enable high efficiency over a wide input voltage range, and the LT8645’s current mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, a power good flag, output soft-start/tracking and thermal protection.
The LT8645SEV is packaged in a 4mm x 6mm LQFN package. An industrial temperature version, the LT8645SIV, is tested and guaranteed to operate from a –40°C to 125°C operating junction temperature. Pricing starts at $5.95 each for 1,000-piece quantities and both versions are available from stock. For more information, visit www.linear.com/product/LT8645S.
Summary of Features: LT8645S
• Silent Switcher® 2 Architecture
o Ultralow EMI/EMC Emissions on Any PCB
o Eliminates PCB Layout Sensitivity
o Internal Capacitors for VIN, BST, INTVCC Reduce Radiated EMI
o Spread Spectrum Frequency Modulation
• High Efficiency at High Frequency
• Up to 95% Efficiency at 1MHz
• Up to 94% Efficiency at 2MHz
• Wide Input Voltage Range: 3.4V to 65V
• 8A Maximum Continuous Output Current
• Ultralow Quiescent Current Burst Mode® Operation
o 2.5µA IQ Regulating 12VIN to 3.3VOUT
o Output Ripple < 10mVP-P
• Fast Minimum Switch On-Time: 40ns
• Low Dropout Under All Conditions: 60mV at 1A
• Programmable Pulse-Skipping Mode
• Safely Tolerates Inductor Saturation in Overload
• Adjustable & Synchronizable: 200kHz to 2.2MHz
• Output Soft-Start & Tracking
• Small 32-Lead 4mm × 6mm LQFN Package
Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.
Source:http://www.linear.com/