2A Bus Termination Regulator

Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Aug., 2013

APL5338A

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

•

Sourcing and Sinking Current up to 2A

•

VCNTL Supply Voltage Range: 3.1V to 5.5V

•

VIN Supply Voltage Range: 1.2V to 3.6V

•

VTT and VTTREF Voltage Tracks at Half the VREF

Voltage

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VTT and VTTREF Voltage with

±10mV Accuracy

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Excellent Load Transient Response

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Stable with 10

µF Ceramic Output Capacitor

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Current-Limit Protection

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Thermal Shutdown Protection

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Power-On-Reset Function on VCNTL

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S3, S5 Input Signals for ACPI States

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Small MSOP-10P, DFN2x2-8 and TDFN3x3-10

Packages

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Lead Free and Green Devices Available

(RoHS Compliant)

Features

Applications

General Description

The APL5338A linear regulator is designed to provide a

regulated voltage with bi-directional output current for

DDR-SDRAM termination. The APL5338A integrates two

power transistors to source or sink current up to 2A. It

also incorporates current-limit and thermal shutdown into

a single chip.

The output voltage of APL5338A tracks the voltage at VREF

pin. An internal resistor divider is used to provide a half

voltage of VREF for VTTREF and VTT Voltage. The VTT

output voltage is only requiring 10

µF of ceramic output

capacitance for stability and fast transient response. The

S3 and S5 pins provide the sleep state for VTT (S3 state)

and suspend state (S4/S5 state) for device when S5 and

S3 are both pulled low the device provides the soft-off for

VTT and VTTREF. The MSOP-10P, DFN2x2-8 and

TDFN3x3-10 packages with a copper pad is available

which provides excellent thermal impedance.

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DDR 2/3 Memory Termination

Simplified Application Circuit

VREF

VTT

VIN

PGND

VTTSNS

VCNTL

S5

GND

S3

VTTREF

APL5338A

1

2

3

4

5

6

9

8

7

10

10

µF

10

µF

C1

0.1

µF