LT3753HFE

LT3753HFE Application Field and Working Principle

The LT3753HFE is a high current DC/DC switching controller featuring internal MOSFET drivers and an adjustable frequency PWM current mode control. It is designed to provide up to 5A output current along with efficient, fast transient response, and help to conserve power while providing a 3V to 38V input voltage range.

Application Field

The LT3753HFE is suitable for use in a wide variety of applications including portable electronics, home appliances, medical instruments, automotive and mobile equipment, etc. It is ideal for applications requiring step-up from 3V to 5V and step-up, step-down from 3V to 38V.

The LT3753HFE can also be used to tailor an adjustable voltage output, for example for optimizing system performance and conserving power when used with a single battery or multi-cell batteries. Additionally, its integrated internal circuits can reduce external component count, PCB board space, and cost, allowing engineers to design solutions that are smaller and more reliable.

Working Principle

The LT3753HFE uses a high-frequency, pulse-width modulation (PWM) current mode controller to control the output voltage. The controller operates over a wide operating range of 3V to 38V, with a peak output current of 5A. It imposes constant-on-time (COT) control during PWM allowing fast transient response, improved light- and load-transient performance, and reduced out-of-regulation time.

The LT3753HFE also integrates an internal MOSFET driver and external voltage feedback, making it ideal for buck, boost and buck-boost converters. It also has the ability to run in Pulse-Skipping Mode (PSM) to improve efficiency at light-load operation.

The LT3753HFE provides comprehensive protection features including undervoltage lockout (UVLO), cycle-by-cycle current limit, hiccup mode over-current protection, short-circuit protection (SCP), and thermal shutdown. It also includes a Power Good flag, a precision enable function, and a soft-start function with adjustable time.

Conclusion

The LT3753HFE is an advanced DC/DC switching controller from Linear Technology which can be used for a wide range of applications including portable electronics, home appliances, medical instruments, automotive and mobile equipment, etc. It provides constant-on-time (COT) control for fast transient response, improved light- and load-transient performance, and reduced out-of-regulation time. It also integrates an internal MOSFET driver and external voltage feedback. Additionally, it features comprehensive protection features and several user-friendly functions. All these features make the LT3753HFE an ideal choice for designers who want a compact and reliable DC/DC converter.