No R Current Mode Boost DC/DC Controller

The LTC3872-1 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external components. The No RSENSE™ architecture eliminates the need for a sense resistor, improves efficiency and saves board space.

The LTC3872-1 provides excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.3V.

LTC3872-1 has the same functionality as the standard LTC3872 except that it has no frequency foldback in current limit.

High switching frequency of 550kHz allows the use of a small inductor. The LTC3872-1 is available in an 8-lead low profile (1mm) ThinSOT™ package and 8-pin 2mm × 3mm DFN package.

LTC3872

LTC3872-1

Frequency Foldback In Current Limit

Yes

No

Applications

* Telecom Power Supplies

* 42V Automotive Systems

* 24V Industrial Controls

* IP Phone Power Supplies

* No Current Sense Resistor Required* VOUT up to 60V* Constant Frequency 550kHz Operation* Internal Soft-Start and Optional External Soft-Start* Adjustable Current Limit* Pulse Skipping at Light Load* VIN Range: 2.75V to 9.8V* ±1.5% Voltage Reference Accuracy* Current Mode Operation for Excellent Line and Load Transient Response* Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages