The LT1737 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It features driving an external power MOSFET, a wide supply voltage range, and direct sensing of the output voltage from the primary side winding.
The LT1737 controller is designed for isolated flyback topologies, driving an external MOSFET and providing regulation from 4.5 V to 20 V input. It offers features such as optional load compensation, undervoltage lockout, and a shutdown mode that reduces quiescent current to 50 µA.
The datasheet includes electrical characteristics, pin functions, typical application circuits, timing diagrams, and package dimensions for the 16‑lead SSOP and SO versions. It is intended for use in medical instruments, instrumentation power supplies, and other isolated flyback applications.
| Supply Voltage Range | 4.5 V to 20 V |
|---|---|
| Switching Frequency Range | 50 kHz to 250 kHz |
| Shutdown Current (typ) | 50 µA |
| UVLO Pin Lockout Threshold | 1.21 V to 1.29 V |
| Package Types | 16‑lead SSOP and 16‑lead SO |
The LT1737 operates with a supply voltage from 4.5 V up to 20 V.
The device can be set to switch between 50 kHz and 250 kHz using an external capacitor.
In shutdown mode the quiescent current is reduced to about 50 µA typical.
The controller is offered in 16‑lead plastic SSOP (narrow) and 16‑lead plastic SO packages.