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TPS78225-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS78225-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 19 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 TPS78225-Q1, TPS78227-Q1 TPS78228-Q1, TPS78230-Q1 SBVS138 – DECEMBER 2009 www.ti.com 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 16. The TPS782xx 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 16. Circuit Showing EN Tied High when Shutdown Capability is Not Required DROPOUT VOLTAGE The TPS782xx series use a PMOS pass transistor to achieve low dropout. When (VIN – VOUT) is less than the dropout voltage (VDO), the PMOS pass device is the linear region of operation and the input-to-output resistance is the RDS(ON) of the PMOS pass element. VDO approximately scales with output current 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 Typical Characteristics section. See the application report Understanding LDO Dropout (SLVA207) available for download from www.ti.com. TRANSIENT RESPONSE As with any regulator, increasing the size of the output capacitor reduces over/undershoot magnitude but increases duration of the transient response. ACTIVE VOUT PULL-DOWN In the TPS782xx series, the active pulldown discharges VOUT when the device is off. However, the input voltage must be greater than 2.2 V for the active pulldown to work. MINIMUM LOAD The TPS782xx series are stable with no output load. Traditional PMOS LDO regulators suffer from lower loop gain at very light output loads. The TPS782xx 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. 10 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TPS78225-Q1 TPS78227-Q1 TPS78228-Q1 TPS78230-Q1 |
Número de pieza similar - TPS78225-Q1_16 |
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Descripción similar - TPS78225-Q1_16 |
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