APL5331 查看數據表（PDF） - Anpec Electronics

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APL5331

3A Bus T ermination Regulator

Anpec Electronics 

APL5331

3A Bus Termination Regulator

Features

General Description

• Provide Bi-direction Current

- Sourcing or Sinking Current up to 3A

• 1.25V/0.9V Output for DDR I/II Applications

• Fast Transient Response

• High Output Accuracy

- ±20mV over Load, VOUT Offset and Temperature

• Adjustable Output Voltage by External Resistors

• Current-Limit Protection

• On-Chip Thermal Shutdown

• Shutdown for Standby or Suspend Mode

• Simple SOP-8, SOP-8P with thermal pad,

TO-252-5 and TO-263-5 Packages

• Lead Free and Green Devices Available

(RoHS Compliant)

Applications

• DDR I/II SDRAM Termination

• SSTL-2/3 Termination Voltage

• Applications Requiring the Regulator with

Bi-directional 3A Current Capability

The APL5331 linear regulator is designed to provide a

regulated voltage with bi-directional output current for

DDR-SDRAM termination voltage. The APL5331 inte-

grates two power transistors to source or sink current

up to 3A. It also incorporates current-limit, thermal shut-

down and shutdown control functions into a single chip.

The current-limit circuit limits the short-circuit current.

The on-chip thermal shutdown provides protection

against any combination of overload that would create

excessive junction temperature. The output voltage of

APL5331 tracks the voltage at VREF pin. A resistor di-

vider connected to VIN, GND and VREF pins is used to

provide a half voltage of VIN to VREF pin. In addition, an

external ceramic capacitor and an open-drain tran-

sistor connected to VREF pin provide soft-start and shut-

down control respectively. Pulling and holding the VREF

voltage to 0V shuts off the output. The output of the

APL5331 will be high impedance in shutdown condition.

Pin Configuration

VIN 1

GND 2

VREF 3

VOUT 4

8 VCNTL

7 VCNTL

6 VCNTL

5 VCNTL

SOP-8 (Top View)

VOUT

TAB is VCNTL

VREF

VCNTL

GND

VIN

TO-252-5 (Top View)

VIN 1

GND 2

VREF 3

VOUT 4

8 NC

7 NC

6 VCNTL

5 NC

SOP-8P (Top View)

NC = No internal connection

5

4

TAB is VCNTL

3

2

1

TO-263-5 (Top View)

VOUT

VREF

VCNTL

GND

VIN

= Thermal Pad (connected to GND plane for better heat dissipation)

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.

Copyright © ANPEC Electronics Corp.

1

Rev. B.4 - Mar., 2008

www.anpec.com.tw

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