a8447 Allegro MicroSystems, Inc., a8447 Datasheet

a8447

Manufacturer Part Number

a8447

Description

A8447 High-voltage Step-down Regulator

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A8447.pdf (9 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

a8447SLJTR-T

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

a8447ST

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

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Features and Benefits

▪ Wide input voltage range: 8 to 50 V

▪ Integrated low R

▪ 3 A continuous output current

▪ Adjustable fixed off-time

▪ Highly efficient

▪ Adjustable output: 0.8 to 24 V

▪ Small package with exposed thermal pad

Package: 8 pin SOIC with exposed thermal

pad (suffix LJ)

A8447-DS, Rev. 1

RTSET

54 k

BOOT

ENB

TSET

GND

A8447

Approximate Scale 1:1

DS(on)

VBIAS

VIN

Data is for reference only. Efficiency data from circuit shown in left panel.

DMOS switch

CBOOT

0.01 μF

2.87 k

910

L 1

CIN2

CBYP

0.22 μF

+42 V

Typical Application

ESR

High Voltage Step Down Regulator

220 μF

25 V

CIN1

0.22 μF

COUT

3.3 V

3 A

OUT

Description

The A8447 is a 3 A, high efficiency general-purpose buck

regulator designed for a wide variety of applications. The output

voltage is adjustable from 0.8 to 24 V, based on a resistor divider

and the 0.8 V ± 3 % reference. External components include an

external clamping diode, inductor, and filter capacitor. The off-

time is determined by an external resistor to ground. It operates

in both continuous and discontinuous modes to maintain light

load regulation. An internal blanking circuit is used to filter

out transients due to the reverse recovery of the external clamp

diode. Typical blanking time is 200 ns.

This new device is ideal for various end products including

applications with 8 to 50 V input voltage range and require up

to 3 A output current, such as uninterruptible power supplies,

point of sale (POS) applications, and industrial applications

with 24 or 36 V bus.

Applications include:

▪ Printer power supplies

▪ Office automation equipment

▪ POS thermal, laser, photo, and inkjet printers

▪ Tape drives

▪ Industrial applications

90.0

88.0

86.0

84.0

82.0

80.0

78.0

76.0

74.0

72.0

70.0

500

Efficiency vs. Output Current

1000

OUT

(mA)

1500

2000

OUT

A8447

2500

3.3

(V)

3000

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