2-Phase Dual Output Non-Synchronous Boost Controller with Hiccup Mode

The LTC®7840 is a dual phase dual output, constant frequency current mode, nonsynchronous boost controller that drives N-channel power MOSFETs. The nonsynchronous topology makes the output voltage dependent on the choice of external components.

A wide 5.5V to 60V input supply range can accommodate high input voltage surges. The LTC7840 can be configured as a dual phase single output or dual output controller. It can be also configured for the SEPIC and flyback topologies. The switching frequency is programmed by the voltage on the FREQ pin or synchronized to an external clock. The LTC7840 features a precise 1.2V internal reference. It has two RUN pins and two power good output indicators.

The LTC7840 has an internal 10V LDO with undervoltage lockout protection for its on-chip gate driver. The maximum duty cycle and blanking time can be programmed by the voltage on DMAX and BLANK pins, respectively. The hiccup mode protects the system in the event of faults.

The LTC7840 is available in a 28-lead thermally enhanced TSSOP package (FE28) or a 28-lead QFN package (UFD28).

Applications

* Automotive System, Telecom System and Industrial Power Supplies

* Wide VIN Range: 5.5V to 60V

* Configurable for Dual Phase Single/Dual Output Operation

* Peak Current Mode Control with Smooth Quadratic Slope Compensation and Dynamic Slope Recovery

* Adjustable Max Duty Cycle

* Adjustable Min On-Time

* Hiccup Mode for Overcurrent Protection