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News
42V, Dual 4A (IOUT), Synchronous Step-Down Silent Switcher 2 Delivers 94% Efficiency at 2MHz & Ultralow EMI Emissions
2017-10-16 | ReturnThe LT8650S’s synchronous rectification delivers efficiency as high as 94.6% with a switching frequency of 2MHz. Its 3.0V to 42V input voltage range is ideal for automotive and industrial applications. The internal high efficiency switches can deliver up to 4A of continuous output current simultaneously and up to 6A peak loads on either channel to output voltages as low as 0.8V. The LT8650S’s Burst Mode® operation ensures only 6.2µA of quiescent current (for both channels), well suited for applications such as automotive always-on systems, which require extended operating battery life. The LT8650S’s fast minimum on-time of only 40ns enables 2MHz constant frequency switching from a 16V input to a 2V output, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands. The LT8650S’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 LT8650S utilizes internal top and bottom high efficiency power switches with the necessary boost diodes, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVP-P. For applications requiring very fast transient response or current sharing of the two channels, external VC pins are available. For the lowest noise operation, the LT8650S can be programmed to run in forced continuous mode over the entire load range with spread spectrum frequency modulation. Its switching frequency is programmable and synchronizable from 300kHz to 3MHz. Special design techniques and a new high speed process enable high efficiency over a wide input voltage range, and the LT8650S’s current mode topology enables fast transient response and excellent loop stability. Other features include a die temperature monitor, power good flags, output soft-start/tracking and thermal protection.
The LT8650SEV is packaged in a 4mm x 6mm LQFN package. An industrial temperature version, the LT8650SIV, is tested and guaranteed to operate from a ̶40°C to 125°C operating junction temperature. Pricing starts at $5.75 each for 1,000-piece quantities and both versions are available from stock. For more information, visit www.linear.com/product/LT8650S.
Summary of Features: LT8650S
• Wide Input Voltage Range: 3.0V to 42V
• 4A from Each Channel Simultaneously:
Up to 6A on Either Channel
• Silent Switcher® 2 Architecture:
Ultralow EMI Emissions on any PCB
Eliminates PCB Layout Sensitivity
Internal Capacitors for VIN, BST, INTVCC Reduce Radiated EMI
Spread Spectrum Frequency Modulation
• Ultralow Quiescent Current Burst Mode® Operation:
6.2μA IQ Regulating 12VIN to 5VOUT1 & 3.3VOUT2
Output Ripple <10mVP-P
• Optional External VC Pin: Fast Transient Response & Current Sharing (Extra 50µA IQ/Channel)
• Forced Continuous Mode
• High Efficiency Synchronous Operation:
94.6% Efficiency at 2A, 5VOUT from 12VIN at 2MHz
93.3% Efficiency at 4A, 5VOUT from 12VIN at 2MHz
• Fast Minimum Switch on Time: 40ns
• Die Temperature Monitor
• Adjustable & Synchronizable: 300kHz to 3MHz
• Output Soft-Start & Tracking
• Small Thermally Enhanced 4mm × 6mm 32-Lead 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/