Analog Devices Inc. LT86x Synchronous Step-Down Silent Switchers
Analog Devices LT86xx Synchronous Step-Down Regulators feature Silent Switcher® architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN package, the monolithic construction with integrated power switches and the inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultra-low 2.5µA quiescent current enables applications requiring the highest efficiency at very small load currents. The transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.
The LT86xx devices allow high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns to 35ns. The operation is safe in overload even with a saturated inductor. Essential features are included and easy to use. An open drain PG pin signals when the output is in regulation. Soft-start and tracking functionality is accessed via the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.
Features
- Silent Switcher® Architecture
- High Efficiency at High Frequency
- Wide Input Voltage Range: 3V to 65V
- 3.5A Maximum Continuous Output, 5A Peak Transient Output
- Ultralow Quiescent Current Burst Mode® Operation: 2.5μA IQ Regulating 12VIN to 3.3VOUT; Output Ripple < 10mVP-P
- Fast Minimum Switch-On Time: 30ns to 35ns
- Low Dropout Under All Conditions
- Safely Tolerates Inductor Saturation in Overload
- Adjustable and Synchronizable: 200kHz to 3MHz
- Peak Current Mode Operation
- Output Soft-Start and Tracking
- Small 18-Lead 3mm × 4mm QFN package
Applications
- Automotive and Industrial Supplies
- General Purpose Step-Down
- GSM Power Supplies
Resource
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VIN from 3V up to 100V+, switching frequencies to 4MHz and high-efficiency operation up to 96%.