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TPS75933 Datasheet(PDF) 4 Page - Texas Instruments |
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TPS75933 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 25 page www.ti.com TPS759xx PG TIMING DIAGRAM NOTE A: 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 PIN FUNCTIONS Enable (EN) Power-Good (PG) Feedback (FB) TPS75901, TPS75915 TPS75918, TPS75925, TPS75933 SLVS318E – DECEMBER 2000 – REVISED MARCH 2004 The TPS759xx 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 TPS75901 (adjustable from 1.22 V to 5 V). The bandgap voltage is typically 1.22 V. 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, then the device will be enabled. 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 VOreaches 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 91% (i.e., over load condition) of the regulated voltage. The open drain output of the PG terminal requires a pullup resistor. 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. 4 |
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