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TPS75718KTTR Datasheet(PDF) 4 Page - Texas Instruments |
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TPS75718KTTR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 29 page TPS75715, TPS75718, TPS75725, TPS75733 WITH POWER GOOD AND TPS75701 FAST TRANSIENT RESPONSE 3A LOW DROPOUT VOLTAGE REGULATORS SLVS306E − NOVEMBER 2000 − REVISED FEBRUARY 2009 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TPS757xx PG timing diagram NOTE: VIT −Trip voltage is typically 9% lower than the output voltage (91%VO). VIT− to VIT+ is the hysteresis voltage. t t t Threshold Voltage PG Output VIT +(see Note A) VIN1 VOUT VIT − (see Note A) VUVLO VUVLO detailed description The TPS757xx family includes four fixed-output voltage regulators (1.5 V, 1.8 V, 2.5 V, and 3.3 V), and an adjustable regulator, the TPS75701 (adjustable from 1.22 V to 5 V). The bandgap voltage is typically 1.22 V. pin functions enable (EN) The EN terminal is an input which enables or shuts down the device. If EN is a logic high, the device will be in shutdown mode. When EN goes to logic low, the device will be enabled. power-good (PG) The PG terminal for the fixed voltage option devices is an open drain, active low output that indicates the status of VO (output of the LDO). When VO reaches approximately 91% of the regulated voltage, PG will go to a low impedance state. It will go to a high-impedance state when VO falls below approximately 89% (i.e. over load condition) of the regulated voltage. The open drain output of the PG terminal requires a pullup resistor. feedback (FB) FB is an input terminal used for the adjustable-output option and must be connected to the output terminal either directly, in order to generate the minimum output voltage of 1.22 V, or through an external feedback resistor divider for other output voltages. The FB connection should be as short as possible. It is essential to route it in such a way to minimize/avoid noise pickup. Adding RC networks between FB terminal and VO to filter noise is not recommended because it may cause the regulator to oscillate. |
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