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Linear Regulators (LDO) | CS5233-3

500mA and 1.5A, 3.3V Dual Input Linear Regulator with Auxiliary Control

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Overview

The CS5233-3 provides a glitch-free 3.3V output from one of three possible supplies, (VIN, VSB and 3.3VAUX). An on-chip linear regulator powers the output when either VIN or VSB is available. Otherwise AuxDrv turns on an external PFET, which connects the 3.3VAUX supply to the out- put. The CS5233-3 is intended to provide power to an ASIC on a PCI Network Interface Card (NIC), and meets Intel's "Instantly Available" power requirements which follow from the Advanced Configuration and Power Interface (ACPI) standards. Other applications include desktop computers, power supplies with multiple input sources, and PCMCIA interface cards.

The CS5233-3 linear regulator provides a fixed 3.3V output at up to 1.5A with an overall accuracy of +/- 2%. 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. The auxiliary drive control feature allows the use of an external PFET to supply power to the output when the regulator supplies are off.

The CS5233-3 regulator is available in two package types: the 5 Lead D2PAK package (TO-263) and 8 Lead SOIC with 4 Lead Fused (DF8) package. When powered from the VIN source, the D2PAK is rated for 1.5A and the 8 Lead SOIC is rated for 500mA. Both packages are rated for 500mA when only powered from the VSB source.

  • Linear Regulator
    3.3V +/- 2% Output Voltage
    Current Limit
    Thermal Shutdown with Hysteresis
    400mA Reverse Current
    ESD Protected
  • System Power Management
    Auxiliary Supply Control
    "Glitch Free" Transition Between 3 Sources
    Similar to CS5231-3
  • High Output Current Capability
    1.5A D2PAK
    500mA 8 Lead SOIC DF8
  • Internally Fused Leads in SO-8 Package

Material Composition

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CS5233-3GDF8

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

751-07

1

235

TUBE

98

N

-

Positive

3.3

0.5

-

6

1.5

-

-

-

-

-

-

Price N/A

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