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CS5231-3 |CS52313TIN/a2150avai500mA, 3.3V Linear Regulator with Auxiliary Control
CS5231-3GDPR5 |CS52313GDPR5ONN/a6750avai500mA/ 3.3V Linear Regulator with Auxiliary Control


CS5231-3GDPR5 ,500mA/ 3.3V Linear Regulator with Auxiliary ControlELECTRICAL CHARACTERISTICS (0°C < T < 70°C; 0°C < T < 125°C; 4.75 V ≤ V < 6.0 V; C ≥ 10 F withA ..
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CS5231-3-CS5231-3GDPR5
500mA, 3.3V Linear Regulator with Auxiliary Control
CS5231-3
500 mA, 3.3 V Linear
Regulator with Auxiliary
Control
The CS5231−3 combines a three−terminal linear regulator with
circuitry controlling an external PFET transistor thus managing two
input supplies. The part provides a 3.3 V regulated output either from
the main 5.0 V supply or a 3.3 V auxiliary that switches on when the
5.0 V supply is not present. This delivers constant, uninterrupted
power to the load. The CS5231−3 meets Intel’s “Instantly Available”
power requirements which follows from the “Advanced Configuration
and Power Interface” (ACPI) standards developed by Intel, Microsoft
and Toshiba.
The CS5231−3 linear regulator provides a fixed 3.3 V output at
500 mA with an overall accuracy of ± 2.0%. The internal NPN−PNP
composite pass transistor provides a low dropout voltage and requires
less supply current than a straight PNP design. Full protection with
both current limit and thermal shutdown is provided.
Designed for low reverse current, the IC prevents excessive current
from flowing from VOUT to either VIN or ground when the regulator
input voltage is lower than the output voltage.
The CS5231−3 can be used to provide power to an ASIC on a PCI
Network Interface Card (NIC). When the system enters a Sleep State
and the 5.0 V input drops below 4.4 V , the AuxDrv control signal on the
CS5231−3 is activated turning on the external PFET. This switches the
supply source from the 5.0 V input to the 3.3 V input through the PFET,
guaranteeing a constant 3.3 V output to the ASIC that is “glitch free.”
The CS5231−3 is available in two package types: the D2 PAK−5
(TO263) package and the SOIC−8 4−Lead−fused (DF) package. Other
applications include desktop computers, power supplies with multiple
input sources and PCMCIA/PCI interface cards.
Features
Linear Regulator 3.3 V ± 2.0% Output Voltage 3.0 mA Quiescent Current @ 500 mA Fast Transient Response Current Limit Protection Thermal Shutdown with Hysteresis 450 �A Reverse Output Current System Power Management Auxiliary Supply Control “Glitch Free” Transition Between Two Supplies Internally Fused Leads in SOIC−8 Package
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