The LT1339 is a high power synchronous current mode switching regulator controller. The IC drives dual N-channel MOSFETs to create a single IC solution for high power DC/DC converters in applications up to 60V. The LT1339 incorporates programmable average current limiting, allowing accurate limiting of DC load current independent of inductor ripple current. The IC also incorporates user-adjustable slope compensation for minimization of magnetics at duty cycles up to 90%. The LT1339 timing oscillator operating frequency is programmable and can be synchronized up to 150kHz. Minimum off-time operation provides main switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions. An output phase reversal pin allows flexibility in configuration of converter types, including inverting and negative topologies.
The LT1339 is a high‑power synchronous current‑mode switching regulator controller that drives dual N‑channel MOSFETs for DC/DC converters up to 60 V. It integrates programmable average current limiting, user‑adjustable slope compensation, a programmable oscillator (up to 150 kHz), soft‑start, and an output phase‑reversal pin for flexible converter topologies.
Typical applications include telecom power supplies, PCs, distributed power converters, industrial control systems, battery backup, and automotive equipment. The datasheet details electrical characteristics, pin descriptions, and performance curves such as supply current versus temperature and reference voltage regulation.
| Operating Frequency | up to 150 kHz |
|---|---|
| 5 V Reference Output Current | up to 10 mA |
| Input Supply Voltage Range | –0.3 V to 20 V (12 V IN) |
| Shutdown Threshold | 1.25 V typical |
The controller can operate with an input voltage up to 60 V (75 V absolute maximum).
Pin 2 (5V REF) provides a 5 V output reference that can source up to 10 mA DC.