The LT8641EUDC#TRPBF step-down regulator features Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.
The LT8641EUDC#TRPBF allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 35ns. 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. The SYNC/MODE pin selects between Burst Mode, pulse-skipping, or spread spectrum mode, and also allows synchronization to an external clock. 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.
Silent Switcher® Architecture
Ultralow EMI Emissions
Spread Spectrum Frequency Modulation
High Efficiency at High Frequency
Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT
Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
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: 35ns
Low Dropout Under All Conditions: 130mV at 1A
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
Automotive and Industrial Supplies
General Purpose Step-Down
GSM Power Supplies
Product Lifecycle Status
Transferred
Case/Package
18-WFQFN Exposed Pad
RoHS
Compliant
Lead Free Status
Lead Free
For the LT8641EUDC#TRPBF component, you may consider these replacement and alternative parts.
| Models | Manufacturer | Package/Case | Description |
|---|---|---|---|
| LT8641EUDC#TRMPBF | |||
| LT8641EUDC#PBF | ADI | 20-WFQFN, 18 Leads, Exposed Pad | IC REG BUCK ADJ 3.5A 20QFN |