EUROPE

Astec House, Waterfront Business Park

Merry Hill, Dudley

West Midlands, DY5 1LX, UK

Telephone: 44 (1384) 842-211

Facsimile: 44 (1384) 843-355

AMERICAS

5810 Van Allen Way

Carlsbad, CA 92008

Telephone: 760-930-4600

Facsimile: 760-930-0698

2

Ordering Information

www.astecpower.com

ASIA

Units 2111-2116, Level 21

Tower1, Metroplaza

223, Hing Fong Road

Fwai Fong, New Territories

Hong Kong

Telephone: 852-2437-9662

Facsimile: 852-2402-4426

Input

Output

Output

Efficiency

Model Number

Voltage

Voltage

Current

42V to 53V

12.0V

25A*

96% Typ

ALQ25B50

42V to 53V

12.0V

25A*

96% Typ

ALQ25B50-6

42V to 53V

12.0V

25A*

96% Typ

ALQ25B50N

42V to 53V

12.0V

25A*

96% Typ

ALQ25B50N-6

36V to 53V

12.0V

25A*

96% Typ

ALQ25B50N-AL

OPTIONS:

Enable Function

"N" = negative logic enable

without "N" = positive logic enable (default)

Pin Length Option

“-6” = 3.7mm (nominal)

Standard pin length is 5mm nominal

Others

“-AL” = Autorecovery mode and lower UVLO range (34V to 36Vdc)

* Derating / airflow required at elevated ambient operating temperature, consult the Technical Rreference Notes

2.00

[50.8]

2.30

[58.4]

PIN SIDE DOWN

PIN SIDE UP

0.15

[3.8]

1.04

[26.5]

0.74

[18.9]

0.44

[11.2]

1.48

[37.6]

1

2

3

SIDE VIEW

MECHANICAL TOLERANCE ± .002(0.5)

ALL DIMENSIONS ARE IN INCHES (MILLIMETERS)

PIN PLACEMENT TOLERANCE : ± 0.005(0.127)

4 - Vout

5+ Vout

0.44

[11.2]

0.60

[15.2]

1 + Vin

3 -VIN

2 Enable (On/Off)

PIN ASSIGNMENT

NOTES:

0.06 Ø

0.22

[5.5]

0.38

[9.6]

5

4

[1.0Ø]

0.04Ø

[1.5Ø]

Pin Assignments

Single Output

1.

+ Vin

2.

Enable

3.

- Vin

4.

- Vout

5.

+ Vout

1. Part number suffix “-AL” designates:

- 36V to 53V Input voltage range

- lower UVLO range (34V to 36V)

- Autorecovery mode after fault protection

2. 20MHz BW limited with external 10uF tantalum

cap. + 0.1uF ceramic cap across the output.

220uF low ESR cap required across the input

pins.

3. Output may need to be derated and airflow

added when operating at elvetaed ambient

temperature.

4. All specifications are typical at nominal line, full

noted.

5. Technical Reference Notes should be consulted

for detailed information when available.

6. Warranty: 1yr

Astec reserves the right to make changes to the information

contained herein without notice and assumes no liability as a

result of its use or application. (REV 01: APRIL 7, 2005)

0.20

[5.0]