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TPS75801KC Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPS75801KC
Descripción Electrónicos  FAST-TRANSIENT RESPONSE, 3A, LOW-DROPOUT VOLTAGE REGULATORS
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TPS75801KC Datasheet(HTML) 11 Page - Texas Instruments

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VO
VI
OUT
FB
R1
R2
GND
EN
IN
≤ 0.7 V
≥ 2 V
TPS75801
1
µF
Co
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
R1
R2
2.5 V
3.3 V
3.6 V
UNIT
31.6
51
58.3
30.1
30.1
30.1
k
k
k
Regulator Protection
Input Capacitor
Output Capacitor
TPS75801
,, TPS758A01
TPS75815, TPS75818
TPS75825, TPS75833
SLVS330F – JUNE 2001 – REVISED APRIL 2007
APPLICATION INFORMATION (continued)
Figure 20. TPS75801 Adjustable LDO Regulator Programming
The TPS758xx PMOS-pass transistor has a built-in back diode that conducts reverse currents when the input
voltage drops below the output voltage (for example, during power down). Current is conducted from the output
to the input and is not internally limited. When extended reverse voltage is anticipated, external limiting may be
appropriate.
The TPS758xx also features internal current limiting and thermal protection. During normal operation, the
TPS758xx limits output current to approximately 10A. When current limiting engages, the output voltage scales
back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device
failure, care should be taken not to exceed the power dissipation ratings of the package. If the temperature of
the device exceeds –150
°C (typ), thermal-protection circuitry shuts it down. Once the device has cooled below
+130
°C (typ), regulator operation resumes.
For a typical application, a ceramic input bypass capacitor (0.22
µF to 1µF) is recommended to ensure device
stability. This capacitor should be as close as possible to the input pin. Due to the impedance of the input
supply, large transient currents will cause the input voltage to droop. If this droop causes the input voltage to
drop below the UVLO threshold, the device will turn off. Therefore, it is recommended that a larger capacitor be
placed in parallel with the ceramic bypass capacitor at the regulator input. The size of this capacitor depends on
the output current, response time of the main power supply, and the distance of the main power supply to the
regulator. At a minimum, the capacitor should be sized to ensure that the input voltage does not drop below the
minimum UVLO threshold voltage during normal operating conditions.
As with most LDO regulators, the TPS758xx requires an output capacitor connected between OUT and GND to
stabilize the internal control loop. The minimum recommended capacitance value is 47
µF with an ESR
(equivalent series resistance) of at least 200m
Ω. As shown in Figure 21, most capacitor and ESR combinations
with a product of 47–6 x 0.2 = 9.4–6 or larger will be stable, provided the capacitor value is at least 47
µF. Solid
tantalum electrolytic and aluminum electrolytic capacitors are all suitable, provided they meet the requirements
described in this section. Larger capacitors provide a wider range of stability and better load transient response.
This information and the ESR graphs shown in Figure 18, Figure 19, and Figure 21, is included to assist in
selection of suitable capacitance for the user's application. When necessary to achieve low height requirements
with high output current and/or high load capacitance, several higher ESR capacitors can be used in parallel to
meet these guidelines.
11
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