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Provide Bi-direction Current

General Description (Cont.)

On-chip thermal shutdown provides protection against

any combination of overload that would create ex-

cessive junction temperature. The output voltage of

APL5331 track the voltage at VREF pin. A resistor

divider 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 transistor connected to VREF pin provides soft-

start and shutdown control respectively. Pulling and

holding the VREF to GND shuts off the output. The

output of APL5331 will be high impedance after be-

ing shut down by VREF or thermal shutdown function.

- Sourcing or Sinking Current up to 3A

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

Fast Transient Response

High Output Accuracy

- 鹵20mV over Load, VOUT Offset and

Temperature

鈥?/div>

Adjustable Output Voltage by External Resistors

Current-Limit Protection

On-Chip Thermal Shutdown

Shutdown for Standby or Suspend Mode

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

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

Pin Configuration

VIN

GND

Applications

鈥?/div>

DDR I/II SDRAM Termination

SSTL-2/3 Termination Voltage

Applications Requiring the Regulator with

1

2

3

4

8

7

6

5

VC N TL

VCN TL

VOUT

VREF

VCNTL

GND

VIN

VR EF

VO U T

TAB is VCNTL

SOP-8 (Top View)

VIN

TO-252-5 (Top View)

5

4

3

2

1

VOUT

VREF

VCNTL

GND

VIN

Bi-direction 3A Current Capability

1

2

3

4

8

7

6

5

NC

General Description

The APL5331 linear regulator is designed to provide

a regulated voltage with bi-directional output current

for DDR-SDRAM termination. The APL5331 integrates

two power transistors to source or sink current up to

3A. It also incorporate current-limit, thermal shut-

down and shutdown control functions into a single

chip. Current-limit circuit limits the short-circuit

current.

GND

VREF

VOUT

TAB is VCNTL

VCNTL

NC

SOP-8-P (Top View)

NC = No internal connection

TO-263-5 (Top View)

= 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

錚?/div>

ANPEC Electronics Corp.

Rev. A.8 - Oct., 2003

1

www.anpec.com.tw

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