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LM2776DBVT データシート(PDF) 10 Page - Texas Instruments

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部品番号 LM2776DBVT
部品情報  Switched Capacitor Inverter
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ホームページ  http://www.ti.com
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LM2776DBVT データシート(HTML) 10 Page - Texas Instruments

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LM2776
SNVSA56A – MAY 2015 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: LM2776
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Copyright © 2015–2016, Texas Instruments Incorporated
Feature Description (continued)
Thermal shutdown is most often triggered by self-heating, which occurs when there is excessive power
dissipation in the device and/or insufficient thermal dissipation. LM2776 power dissipation increases with
increased output current and input voltage. When self-heating brings on thermal shutdown, thermal cycling is the
typical result. Thermal cycling is the repeating process where the part self-heats, enters thermal shutdown
(where internal power dissipation is practically zero), cools, turns on, and then heats up again to the thermal
shutdown threshold. Thermal cycling is recognized by a pulsing output voltage and can be stopped be reducing
the internal power dissipation (reduce input voltage and/or output current) or the ambient temperature. If thermal
cycling occurs under desired operating conditions, thermal dissipation performance must be improved to
accommodate the power dissipation of the LM2776.
7.3.5 Undervoltage Lockout
The LM2776 has an internal comparator that monitors the voltage at VIN and forces the device into shutdown if
the input voltage drops to 2.4 V. If the input voltage rises above 2.6 V, the LM2776 resumes normal operation.
7.4 Device Functional Modes
7.4.1 Shutdown Mode
An enable pin (EN) pin is available to disable the device and place the LM2776 into shutdown mode reducing the
quiescent current to 1 µA. In shutdown, the output of the LM2776 is pulled to ground by an internal pullup current
source (approx 1.85 mA).
7.4.2 Enable Mode
Applying a voltage greater than 1.2 V to the EN pin places the device into enable mode. When unloaded, the
input current during operation is 120 µA. As the load current increases, so does the quiescent current. When
enabled, the output voltage is equal to the inverse of the input voltage minus the voltage drop across the charge
pump.


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