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TPS76333QDBVRG4Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS76333QDBVRG4Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page 11 TPS763-Q1, TPS76301-Q1, TPS76316-Q1, TPS76318-Q1 TPS76325-Q1, TPS76330-Q1, TPS76333-Q1, TPS76350-Q1 www.ti.com SGLS247B – SEPTEMBER 2011 – REVISED MARCH 2016 Product Folder Links: TPS763-Q1 TPS76301-Q1 TPS76316-Q1 TPS76318-Q1 TPS76325-Q1 TPS76330-Q1 TPS76333-Q1 TPS76350-Q1 Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated (1) Approximate value for thermal shutdown 8.4 Device Functional Modes 8.4.1 Normal Operation The device regulates to the nominal output voltage under the following conditions: • The input voltage is at least as high as VIN(min). • The input voltage is greater than the nominal output voltage added to the dropout voltage. • The enable voltage is greater than VEN(min). • The output current is less than the current limit. • The device junction temperature is less than the maximum specified junction temperature. 8.4.2 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 of operation, the output voltage is the same as the input voltage minus the dropout voltage. The transient performance of the device is significantly degraded because the pass device is in the linear region and no longer controls the current through the LDO. Line or load transients in dropout can result in large output voltage deviations. 8.4.3 Disabled The device is disabled under the following conditions: • The enable voltage is less than the enable falling threshold voltage or has not yet exceeded the enable rising threshold. • The device junction temperature is greater than the thermal shutdown temperature. • The input voltage is less than UVLOfalling. Table 1 shows the conditions that lead to the different modes of operation. Table 1. Device Functional Mode Comparison OPERATING MODE PARAMETER VIN VEN IOUT TJ Normal mode VIN > VOUT(nom) + VDO and VIN > VIN(min) VEN > VEN(high) IOUT < ILIM TJ < 125°C Dropout mode VIN(min) < VIN < VOUT(nom) + VDO VEN > VEN(high) — TJ < 125°C Disabled mode (any true condition disables the device) VIN < UVLOfalling VEN < VEN(low) — TJ > 165°C (1) |
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