The LTC3779IFEPBF is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phaselockable frequency of up to 600kHz, while an input/output constant current loop provides support for battery charging.
With a wide 4.5V to 150V input and output range and seamless transfers between operating regions, the LTC3779IFEPBF is ideal for automotive, telecom and batterypowered systems.
The LTC3779IFEPBF features a precision 1.2V reference and power good output indicator. The MODE pin can select between pulse-skipping mode or forced continuous mode of operation. Pulse-skipping mode offers high efficiency at light load while forced continuous mode operates at a constant frequency for noise sensitive applications. The PLLIN pin allows the IC to be synchronized to an external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.
Feature
- 4-Switch Current Mode Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
- Wide VIN Range: 4.5V to 150V
- Wide Output Voltage Range: 1.2V ≤ VOUT ≤ 150V
- Synchronous Rectification: Up to 99% Efficiency
- ±1% 1.2V Voltage Reference
- Input or Output Average Current Limit
- On-Board LDO or External NMOS LDO for DRVCC
- 36V EXTVCC LDO Powers Drivers
- Programmable 6V to 10V DRVCC Optimizes Efficiency
- No Top FET Refresh Noise in Boost or Buck Mode
- VOUT Disconnected from VIN During Shutdown
- Phase-Lockable Fixed Frequency (50kHz to 600kHz)
- No Reverse Current During Start-Up
- Power Good Output Voltage Monitor
- 150V Rated RUN Pin with Accurate Turn-On Threshold
- Programmable Input Overvoltage Lockout
- Thermally Enhanced FE38 TSSOP Package Modified for High Voltage Operation
Applications
- Industrial, Automotive, Medical, Military, Avionics
