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LTM8048 Datasheet(PDF) 11 Page - Linear Technology |
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LTM8048 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 22 page  LTM8045 11 8045fa For more information www.linear.com/8045 OPERATION The LTM8045 is a stand-alone switching DC/DC converter that may be configured either as a SEPIC (single-ended primary inductance converter) or inverting power supply simply by tying VOUT– or VOUT+ to GND, respectively. It accepts an input voltage up to 18VDC. The output is adjustable between 2.5V and 15V for the SEPIC, and between –2.5V and –15V for the inverting configuration. The LTM8045 can provide 700mA at VIN = 12V when VOUT = 2.5V or –2.5V. As shown in the Block Diagram, the LTM8045 contains a current mode controller, power switching element, power coupled inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8045 is a fixed frequency PWM converter. The LTM8045 switching can free run by applying a resis- tor to the RT pin or synchronize to an external source at a frequency between 200kHz and 2MHz. To synchronize to an external source, drive a valid signal source into the SYNC pin. An RT resistor is required whether or not a SYNC signal is applied. See the Applications Information section for more details. The LTM8045 also features RUN and SS pins to control the start-up behavior of the device. The RUN pin may also be used to implement an accurate undervoltage lockout function by applying just one or two resistors. The LTM8045 is equipped with a thermal shutdown to protect the device during momentary overload conditions. It is set above the 125°C absolute maximum internal tem- perature rating to avoid interfering with normal specified operation, so internal device temperatures will exceed the absolute maximum rating when the overtemperature protection is active. Therefore, continuous or repeated activation of the thermal shutdown may impair device reliability. |
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