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TPS78228DDCTG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS78228DDCTG4 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 25 page  t=3 10k R W L ´ 10kW +RL C OUT ´ TPS78227 GND EN IN OUT V IN V OUT 1 F m 1 F m 4.2Vto5.5V 2.7V TPS782xx www.ti.com SBVS115B – AUGUST 2008 – REVISED MAY 2010 SHUTDOWN DROPOUT VOLTAGE The enable pin (EN) is active high and is compatible The TPS782 series use a PMOS pass transistor to with standard and low-voltage CMOS levels. When achieve low dropout. When (VIN – VOUT) is less than shutdown capability is not required, EN should be the dropout voltage (VDO), the PMOS pass device is connected to the IN pin, as shown in Figure 23. The the linear region of operation and the input-to-output TPS782 series, with internal active output pull-down resistance is the RDS(ON) of the PMOS pass element. circuitry, discharges the output to within 5% VOUT with VDO approximately scales with output current a time (t) shown in Equation 1: because the PMOS device behaves like a resistor in dropout. As with any linear regulator, PSRR and transient response are degraded as (VIN – VOUT) approaches dropout. This effect is shown in the (1) Typical Characteristics section. Refer to application report SLVA207, Understanding LDO Dropout, Where: available for download from www.ti.com. RL= output load resistance COUT = output capacitance TRANSIENT RESPONSE As with any regulator, increasing the size of the output capacitor reduces over/undershoot magnitude but increases duration of the transient response. For more information, see Figure 19. ACTIVE VOUT PULL-DOWN In the TPS782 series, the active pull-down discharges VOUT when the device is off. However, the input voltage must be greater than 2.2V for the active pull-down to work. Figure 23. Circuit Showing EN Tied High when MINIMUM LOAD Shutdown Capability is Not Required The TPS782 series are stable with no output load. Traditional PMOS LDO regulators suffer from lower loop gain at very light output loads. The TPS782 employs an innovative, low-current circuit under very light or no-load conditions, resulting in improved output voltage regulation performance down to zero output current. See Figure 19 for the load transient response. Copyright © 2008–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 |
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