LTM8027 BLOCK DIAGRAM VIN 6.8µH VOUT 499k 4.7pF 2.2µF RUN INTERNAL AUX CURRENT CONNECTION SS MODE TO V CONTROLLER OUT SYNC INTERNAL INTV BIAS1 CC VIN LINEAR REGULATOR BIAS2 GND RT ADJ 8027 BD OPERATION The LTM8027 is a standalone nonisolated step-down The LTM8027 is a fixed frequency PWM regulator. The switching DC/DC power supply with an input voltage range switching frequency is set by simply connecting the ap- of 4.5V to 60V that can deliver up to 4A of output current. propriate resistor from the RT pin to GND. This module provides a precisely regulated output volt- A linear regulator provides internal power (shown as age up to 24V, programmable via one external resistor. INTV Given that the LTM8027 is a step-down converter, make CC on the Block Diagram) to the control circuitry. The bias regulator normally draws power from the V sure that the input voltage is high enough to support the IN pin, but if the BIAS1 pin is connected to an external volt- desired output voltage and load current. A simplified block age higher than 8.5V, bias power will be drawn from the diagram is given above. The LTM8027 contains a current external source (typically the regulated output voltage). mode controller, power switching element, power induc- This improves efficiency. The RUN pin is used to enable tor, power MOSFETs and a modest amount of input and or place the LTM8027 in shutdown, disconnecting the output capacitance. output and reducing the input current to less than 9µA. 8027fd 10 For more information www.linear.com/LTM8027 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Photograph Package Description Revision History Typical Application Related Parts
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