17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current

The LTC3622 is a dual 1A output, high efficiency synchronous monolithic step-down regulator capable of operating from input supplies up to 17V. The switching frequency is fixed to 1MHz or 2.25MHz with a ±50% synchronization range to an external clock. The regulator features ultralow quiescent current and high efficiency over a wide output voltage range.

The step-down regulators operate from an input voltage range of 2.7V to 17V and provide an adjustable output from 0.6V to VIN while delivering up to 1A of output current. A user-selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency. Burst Mode® operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest ripple noise. The switching regulators can be synchronized to an external clock. Furthermore, fixed VOUT options are available to eliminate the external feedback resistors.

LTC3622 Options

Part Name

Frequency

VOUT

LTC3622

1.00MHz

Adjustable

LTC3622-2

2.25MHz

Adjustable

LTC3622-23/5

2.25MHZ

5V/3.3V

Applications

* Battery Powered Systems

* Point-of-Load Supplies

* Portable – Handheld Scanners

* Dual Step-Down Outputs: 1A Per Channel

* Wide VIN Range: 2.7V to 17V

* Wide VOUT Range: 0.6V to VIN

* Up to 95% Efficiency

* No-Load IQ = 5μA with Both Channels Enabled; IQ < 4μA with Only One Channel Enabled

* High Efficiency, Low Dropout Operation (100% Duty Cycle)

* Constant Frequency (1MHz/2.25MHz) with External Frequency Synchronization