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TPS783 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS783 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 15 page TPS78327 GND EN IN OUT V IN V OUT 1 F m 1 F m 4.2Vto5.5V 2.7V TPS783xx www.ti.com SBVS133 – FEBRUARY 2010 INTERNAL CURRENT LIMIT TRANSIENT RESPONSE The TPS783 is internally current-limited to protect the As with any regulator, increasing the size of the regulator during fault conditions. During current limit, output capacitor reduces over/undershoot magnitude the output sources a fixed amount of current that is but increases duration of the transient response. For largely independent of output voltage. For reliable more information, see Figure 17. operation, the device should not be operated in a current limit state for extended periods of time. MINIMUM LOAD The TPS783 series are stable with no output load. SHUTDOWN Traditional PMOS LDO regulators suffer from lower The enable pin (EN) is active high and is compatible loop gain at very light output loads. The TPS783 with standard and low-voltage CMOS levels. When employs an innovative, low-current circuit under very shutdown capability is not required, EN should be light or no-load conditions, resulting in improved connected to the IN pin, as shown in Figure 22. output voltage regulation performance down to zero output current. See Figure 17 for the load transient response. THERMAL INFORMATION THERMAL PROTECTION Thermal protection disables the device output when the junction temperature rises to approximately +160°C, allowing the device to cool. Once the junction temperature cools to approximately +140°C, the output circuitry is enabled. Depending on power dissipation, thermal resistance, and ambient Figure 22. Circuit Showing EN Tied High when temperature, the thermal protection circuit may cycle Shutdown Capability is Not Required on and off again. This cycling limits the dissipation of the regulator, protecting it from damage as a result of overheating. DROPOUT VOLTAGE Any tendency to activate the thermal protection circuit The TPS783 series use a PMOS pass transistor to indicates excessive power dissipation or an achieve low dropout. When (VIN – VOUT) is less than inadequate heatsink. For reliable operation, junction the dropout voltage (VDO), the PMOS pass device is temperature should be limited to +105°C maximum. the linear region of operation and the input-to-output To estimate the margin of safety in a complete design resistance is the RDS(ON) of the PMOS pass element. (including heatsink), increase the ambient VDO approximately scales with output current temperature until the thermal protection is triggered; because the PMOS device behaves like a resistor in use worst-case loads and signal conditions. dropout. As with any linear regulator, PSRR and The internal protection circuitry of the TPS783 series transient response are degraded as (VIN – VOUT) has been designed to protect against overload approaches dropout. This effect is shown in the conditions. However, it is not intended to replace Typical Characteristics section. Refer to application proper heatsinking. Continuously running the TPS783 report SLVA207, Understanding LDO Dropout, series into thermal shutdown degrades device available for download from www.ti.com. reliability. Copyright © 2010, Texas Instruments Incorporated 11 |
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