1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

The LTC3458 is a high efficiency, current mode, fixed frequency, step up DC/DC converter with true output disconnect and inrush current limiting. The LTC3458 is rated for a 7.5V output and includes a 0.3Ω N-channel MOSFET switch and a 0.4Ω P-channel MOSFET synchronous rectifier. The LTC3458 is well suited for battery powered applications and includes programmable output voltage, switching frequency and loop compensation. The oscillator frequency can be set up to 1.5MHz or synchronized to an external clock.

Quiescent current is only 15µA during Burst Mode operation maximizing battery life in portable applications. The Burst Mode current threshold, peak current limit, and softstart are externally programmable. Other features include <1µA shutdown current, antiringing control, and thermal limit. The LTC3458 is available in a low profile (0.75mm), 3mm × 4mm 12-pin DFN package.

Vout Range

Switch Current

LTC3458

2.0V to 7.5V

1.4A

LTC3458L

2.0V to 6.0V

1.7A

Applications

* Point-of-Load Regulators

* USB VBUS Power

* LCD Bias

* OLED Displays

* High Efficiency: Up to 93%

* Inrush Current Limiting and Output Disconnect

* Programmable Output Voltages up to 7.5V

* 1.5V to 6V Input Range

* Programmable/Synchronizable Fixed Frequency Operation up to 1.5MHz

* Programmable Automatic Burst Mode® Operation

* Current Mode Control with Programmable Soft-Start Period and Peak Current Limit

* 700mA at 7V from 5V Input

* 0.3Ω N-Channel and 0.4Ω P-Channel 1.4A Switches at 5VOUT

* Ultralow Quiescent Currents: 15µA Sleep, <1µA in Shutdown

* 3mm × 4mm Thermally Enhanced DFN Package