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CS5231-3GDPR5 Arkusz danych(PDF) 6 Page - ON Semiconductor

Numer części CS5231-3GDPR5
Szczegółowy opis  500 mA, 3.3 V Linear Regulator with Auxiliary Control
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5231-3GDPR5 Arkusz danych(HTML) 6 Page - ON Semiconductor

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CS5231−3
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6
APPLICATION INFORMATION
THEORY OF OPERATION
The CS5231−3 is a fixed 3.3 V linear regulator that
contains an auxiliary drive control feature. When VIN is
greater than the typical 4.5 V threshold, the IC functions as
a linear regulator. It provides up to 500 mA of current to a
load through a composite PNP−NPN pass transistor. An
output capacitor greater than 10
mF with equivalent series
resistance less than 1.0
W is required for compensation.
More information is provided in the Stability Considerations
section.
The CS5231−3 provides an auxiliary drive feature that
allows a load to remain powered even if the VIN supply for
the IC is absent. An external p−channel FET is the only
additional component required to implement this function if
an auxiliary power supply is available. The PFET gate is
connected to the AuxDrv lead. The PFET drain is connected
to the auxiliary power supply, and the PFET source is
connected to the load. The polarity of this connection is very
important, since the PFET body diode will be connected
between the load and the auxiliary supply. If the PFET is
connected with its drain to the load and its source to the
supply, the body diode will be forward−biased if the
auxiliary supply is turned off. This will result in the linear
regulator providing current to everything on the auxiliary
supply rail.
The AuxDrv lead is internally connected to a 10 k
W
resistor and to a saturating NPN transistor that acts as a
switch. If the VIN supply is off, the AuxDrv output will
connect the PFET gate to ground through the 10 k
W resistor,
and the PFET will conduct current to the load.
As the VIN supply begins to rise, the AuxDrv lead will also
rise until it reaches a typical voltage of about 650 mV. The
NPN transistor connected to the AuxDrv lead will saturate
at this point, and the gate of the PFET will be pulled down
to a typical voltage of about 100 mV. The PFET will
continue to conduct current to the load.
The VIN supply voltage will continue to rise, but the linear
regulator output is disabled until VIN reaches a typical
threshold of 4.5 V. During this time, the load continues to be
powered by the auxiliary driver. Once the 4.5 V VIN
threshold is reached, the saturating NPN connected to the
AuxDrv lead turns off. The on−chip 10 k
W pull−up resistor
will pull the PFET gate up to VIN, thus turning the PFET off.
The linear regulator turns on at the same time. An external
compensation capacitor is required for the linear regulator
to be stable, and this capacitance also serves as a charge
reservoir to minimize any “glitching” that might result
during the supply changeover. Hysteresis is present in the
AuxDrv circuitry, requiring VIN to drop by 100 mV (typical)
after the linear regulator is providing power to the load
before the AuxDrv circuitry can be re−enabled.
Figure 13. Initial Power−Up, VAUX Not
Present ROUT = 8.8 W
IOUT = STARTUP 375 mA
VIN
VOUT
VAUXDRV
Figure 14. Power−Up, VAUX = 3.3 V. Note the
“Oscillatory Performance” as the Linear Regulator
Changes the VOUT Node. IOUT y RDS(ON) 9 130 mV
IOUT = 375 mA VAUX = 3.30 V
VIN
VOUT
VAUXDRV
Figure 15. Power−Down, VAUX = 3.3 V. Again,
Note
DV = I RDS(ON) 9 130 mV
IOUT = 375 mA VAUX = 3.30
VIN
VOUT
VAUXDRV


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