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TPS799-Q1 Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS799-Q1
Description  200 mA, Low Quiescent Current, Ultralow Noise, High PSRR, Low Dropout, Linear Regulators
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS799-Q1 Fiches technique(HTML) 9 Page - Texas Instruments

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Thermal
Shutdown
UVLO
Current
Limit
3.3MW
Overshoot
Detect
500k
1.193V
Bandgap
IN
EN
FB
OUT
GND
400W
TPS799-Q1
www.ti.com
SBVS097F – MARCH 2008 – REVISED JUNE 2015
Functional Block Diagrams (continued)
Figure 11. Adjustable-Voltage Version
7.3 Feature Description
7.3.1 Internal Current Limit
The TPS799xx-Q1 internal current limit helps protect the regulator during fault conditions. During current limit,
the output sources a fixed amount of current that is largely independent of output voltage. For reliable operation,
the device should not be operated in current limit for extended periods of time.
The PMOS pass element in the TPS799xx-Q1 has a built-in body diode that conducts current when the voltage
at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is
anticipated, external limiting may be appropriate.
7.3.2 Shutdown
The enable pin (EN) is active high and is compatible with standard and low voltage TTL-CMOS levels. When
shutdown capability is not required, EN can be connected to IN.
7.3.3 Dropout Voltage
The TPS799xx-Q1 uses a PMOS pass transistor to achieve low dropout. When (VIN – VOUT) is less than the
dropout voltage (VDO), the PMOS pass device is in its linear region of operation and the input-to-output
resistance is the RDS, ON of the PMOS pass element. Because the PMOS device behaves like a resistor in
dropout, VDO scales approximately with output current.
As with any linear regulator, PSRR and transient response are degraded as (VIN – VOUT) approaches dropout.
This effect is shown in Figure 7 through Figure 9 in the Typical Characteristics section.
7.3.4 Start-Up
Fixed voltage versions of the TPS799xx-Q1 use a quick-start circuit to fast-charge the noise reduction capacitor,
CNR, if present (see Figure 10). This allows the combination of very low output noise and fast start-up times. The
NR pin is high impedance so a low leakage CNR capacitor must be used; most ceramic capacitors are
appropriate in this configuration.
For the fastest start-up, VIN should be applied first, then the enable pin (EN) driven high. If EN is tied to IN,
startup is somewhat slower. The quick-start switch is closed for approximately 135
μs. To ensure that CNR is fully
charged during the quick-start time, a 0.01
μF or smaller capacitor should be used.
Copyright © 2008–2015, Texas Instruments Incorporated
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