LT1737CGN#PBF

Overview

The LT1737CGN#PBF is a monolithic switching regulator controller designed for high-power isolated flyback topologies. It drives the gate of an external MOSFET to regulate output voltage. The device operates with a single output and supports a switching frequency range from 50 kHz to 250 kHz, with a typical operating point around 90 kHz to 115 kHz. It features a maximum duty cycle of 90% and accepts input voltages between 5 V and 22 V. The supply voltage range is 4.1 V to 20 V, with a quiescent current of 10 mA. It provides up to 500 mA output current capability and includes a shutdown function. The component is housed in a 16-lead SSOP package and operates within a temperature range of 0°C to +100°C.

Feature Summary

• Designed specifically for high-power isolated flyback converter applications
• Integrates control logic to drive external MOSFET gates directly
• Supports flexible switching frequency adjustment across a wide range
• Includes shutdown functionality for power management control

Applications

• Isolated DC-DC power supplies
• High-power flyback converter designs
• Industrial power management systems

Procurement Notes

Verify the specific suffix (#PBF vs #TRPBF) to ensure correct packaging type (Tube vs Reel/Cut Tape) matches assembly requirements. Confirm RoHS compliance status through official Analog Devices documentation. Check for recent Product Change Notifications regarding manufacturing updates. Ensure the SSOP-16 footprint aligns with PCB design constraints. Validate supply availability as distribution channels may indicate limited stock or regional restrictions.

Selection Notes

Select this controller when designing isolated flyback converters requiring precise duty cycle control up to 90%. Consider the 5 V to 22 V input range for compatibility with various bus voltages. The 10 mA supply current offers efficient standby performance. Evaluate the 16-SSOP package for space-constrained layouts. Ensure thermal management supports the +100°C maximum operating temperature. Verify that external MOSFET selection matches the gate drive capabilities.

Part Context

The LT1737 series belongs to Analog Devices' portfolio of switching controllers, specifically optimized for flyback topologies. This part number represents the commercial grade version in a standard SSOP package. It complements other PMIC solutions by providing dedicated control for isolated power stages. The series is known for robust performance in industrial and communication equipment power architectures.

Replacement Considerations

LT1737CGN#TRPBF serves as the tape-and-reel variant of the same functional controller.