The LTC3789EUFD#TRPBF 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 phase-lockable frequency of up to 600kHz, while an output current feedback loop provides support for battery charging. With a wide 4V to 38V (40V maximum) input and output range and seamless, low noise transitions between operating regions, the LTC3789EUFD#TRPBF is ideal for automotive, telecom and battery-powered systems.
The operating mode of the controller is determined through the MODE/PLLIN pin. The MODE/PLLIN pin can select between pulse-skipping mode and forced continuous mode operation and allows the IC to be synchronized to an external clock. Pulse-skipping mode offers high efficiency and low ripple at light loads, while forced continuous mode operates at a constant frequency for noise-sensitive applications.
A PGOOD pin indicates when the output is within 10% of its designed set point. The LTC3789EUFD#TRPBF is available in low profile 28-pin 4mm × 5mm QFN and narrow SSOP packages.
Feature
Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT
Programmable Input or Output Current
Wide VIN Range: 4V to 38V
1% Output Voltage Accuracy: 0.8V < VOUT < 38V
Synchronous Rectification: Up to 98% Efficiency
Current Mode Control
Phase-Lockable Fixed Frequency: 200kHz to 600kHz
No Reverse Current During Start-Up
Power Good Output Voltage Monitor
Internal 5.5V LDO
Quad N-Channel MOSFET Synchronous Drive
VOUT Disconnected from VIN During Shutdown
True Soft-Start and VOUT Short Protection, Even in Boost Mode
Available in 28-Lead QFN (4mm × 5mm) and 28-Lead SSOP Packages
Applications
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
