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LTC1872B - Constant Frequency Current Mode Step-Up DC/DC Controller in ThinSOT

The LTC1872B is a constant frequency current mode step-up DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1872B when the input voltage falls below 2.0V.

The LTC1872B provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. In shutdown, the device draws a mere 8µA.

High constant operating frequency of 550kHz allows the use of a small external inductor. The constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide load current range.

The LTC1872B is available in a 6-lead low profile (1mm) ThinSOT package. For a Burst Mode operation enabled version of the LTC1872B, please refer to the LTC1872 data sheet.

Features Burst Mode™ Operation Disabled for Lower Output Ripple at Light Loads High Efficiency: Over 90% High Output Currents Easily Achieved Wide VIN Range: 2.5V to 9.8V VOUT Limited Only by External Components Constant Frequency 550kHz Operation Current Mode Operation for Excellent Line and Load Transient Response Shutdown Mode Draws Only 8µA Supply Current Low Profile (1mm) ThinSOT™ Package Typical Application

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