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LTM8027IV Datasheet(PDF) 10 Page - Linear Technology |
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LTM8027IV Datasheet(HTML) 10 Page - Linear Technology |
10 / 20 page LTM8027 10 8027f BLOCK DIAGRAM OPERATION The LTM8027 is a standalone nonisolated step-down switching DC/DC power supply with an input voltage range of 4.5V to 60V that can deliver up to 4A of output current. This module provides a precisely regulated output voltage up to 24V, programmable via one external resistor. Given that the LTM8027 is a step-down converter, make sure that the input voltage is high enough to support the desired output voltage and load current. A simplified block diagram is given above. The LTM8027 contains a current mode controller, power switching element, power induc- tor, power MOSFETs and a modest amount of input and output capacitance. The LTM8027 is a fixed frequency PWM regulator. The switching frequency is set by simply connecting the ap- propriate resistor from the RT pin to GND. A linear regulator provides internal power (shown as INTVCC on the Block Diagram) to the control circuitry. The bias regulator normally draws power from the VIN pin, but if the BIAS1and BIAS2 pins are connected to an external voltage higher than 8.5V, bias power will be drawn from the external source (typically the regulated output voltage). This improves efficiency. The RUN pin is used to enable or place the LTM8027 in shutdown, disconnecting the output and reducing the input current to less than 10μA. 8027 BD VIN VIN INTVCC 6.8μH RUN 2.2μF CURRENT MODE CONTROLLER INTERNAL CONNECTION TO VOUT SS SYNC AUX BIAS1 BIAS2 GND RT ADJ VOUT INTERNAL LINEAR REGULATOR 4.7pF 499k |
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