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TPS78222DRVT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS78222DRVT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 29 page TPS78227 GND EN IN OUT V IN V OUT 1 F m 1 F m 4.2Vto5.5V 2.7V t=3 10k R W L ´ 10kW +RL C OUT ´ TPS782 www.ti.com SBVS115D – AUGUST 2008 – REVISED JANUARY 2015 Feature Description (continued) 7.3.3 Shutdown The enable pin (EN) is active high and is compatible with standard and low-voltage CMOS levels. When shutdown capability is not required, EN should be connected to the IN pin, as shown in Figure 22. The TPS782 series, with internal active output pulldown circuitry, discharges the output to within 5% VOUT with a time (t) shown in Equation 1: (1) Where: RL= output load resistance COUT = output capacitance Figure 22. Circuit Showing EN Tied High When Shutdown Capability Is Not Required 7.4 Device Functional Modes Table 1 provides a quick comparison between the normal, dropout, and disabled modes of operation. Table 1. Device Functional Mode Comparison PARAMETER OPERATING MODE VIN EN IOUT TJ Normal VIN > VOUT(nom) + VDO VEN > VEN(HI) IOUT < ILIM TJ < TSD Dropout VIN < VOUT(nom) + VDO VEN > VEN(HI) IOUT < ILIM TJ < TSD Disabled — VEN < VEN(LO) — TJ > TSD 7.4.1 Normal Operation The device regulates to the nominal output voltage under the following conditions: • The input voltage is greater than the nominal output voltage plus the dropout voltage (VOUT(nom) + VDO). • The enable voltage has previously exceeded the enable rising threshold voltage and not yet decreased below the enable falling threshold. • The output current is less than the current limit (IOUT < ILIM). • The device junction temperature is less than the thermal shutdown temperature (TJ < TSD). 7.4.2 Dropout Operation If the input voltage is lower than the nominal output voltage plus the specified dropout voltage, but all other conditions are met for normal operation, the device operates in dropout mode. In this mode, the output voltage tracks the input voltage. During this mode, the transient performance of the device becomes significantly degraded because the pass device is in a triode state and no longer controls the current through the LDO. Line or load transients in dropout can result in large output-voltage deviations. Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS782 |
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