EL7556BC Elantec Semiconductor, EL7556BC Datasheet

EL7556BC

Manufacturer Part Number

EL7556BC

Description

Integrated Adjustable 6 Amp Synchronous Switcher

Manufacturer

Elantec Semiconductor

Datasheet

1.EL7556BC.pdf (13 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

EL7556BCM

Manufacturer:

Quantity:

20 000

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Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these

specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.

Features

Applications

Ordering Information

• EL7556C/EL7556AC Pin-

• Improved temperature and voltage

• 6A continuous load current

• Precision internal 1% reference

• 1.0V to 3.8V output voltage

• Internal power MOSFETs

• >90% efficiency

• Synchronous switching

• Adjustable slope compensation

• Over-temperature indicator

• Pulse-by-pulse current limiting

• Operates up to 1MHz

• 1.5% typical output accuracy

• Adjustable oscillator with sync

• Remote enable/disable

• Intel P54- and P55-compatible

• VCC2DET interface

• Internal soft-start

• PC motherboards

• Local high power CPU supplies

• 5V to 1.0V DC:DC conversion

• Portable electronics/instruments

• P54 and P55 regulators

• GTL+ Bus power supply

EL7556BCM

EL7556BCM-T13

compatible

ranges

Part No

28-Pin SO

Package

Tape &

Reel

13”

MDP0027

Outline #

EL7556BC

Integrated Adjustable 6 Amp Synchronous Switcher

General Description

The EL7556BC is an adjustable synchronous DC:DC switching regu-

lator optimized for a 5V input and 1.0V-3.8V output. By combining

integrated NMOS power FETS with a fused-lead package, the

EL7556BC can supply up to 6A continuous output current without the

use of external power devices or discrete heat sinks, thereby minimiz-

ing design effort and overall system cost.

On-chip resistorless current sensing is used to achieve stable, highly

efficient, current-mode control. The EL7556BC also incorporates the

VCC2DET function to directly interface with the Intel P54 and P55

microprocessors. Depending on the state of VCC2DET, the output

voltage is internally preset to 3.5V or a user-adjustable voltage using

two external resistors. In both internal and external feedback modes

the active-high PWRGD output indicates when the regulator output is

within ±10% of the programmed voltage. An on-board sensor moni-

tors die temperature (OT) for over-temperature conditions and can be

connected directly to OUTEN to provide automatic thermal shutdown.

Adjustable oscillator frequency and slope compensation allow added

flexibility in overall system design.

The EL7556BC is available in a 28-pin SO package and is specified

for operation over the full -40°C to +85°C temperature range.

Connection Diagram

C12 - 1µF

C3, C4, C5, C6, C7 C8 - ceramic

C5, C11 - ceramic or tantalum

C9 - Sprague 293D337X96R3 2X330µF

C10 - Sprague 293D337X96R3 3X330µF

L1 - Pulse Engineering, PE-53681

D1-D4: BAT54S fast diode

D4 Required for EL7556ACM Only

660µF

5.1

Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126

1µF

0.1µF

Connect to VSSP for

external feedback

100

C12

1µF

39pF

220pF

VCC2DET

EL7556BC

FB1

CREF

CSLOPE

COSC

VDD

VIN

VSSP

VIN

VSSP

OUTEN

150

PWRGD

VSSP

TEST

C2V

VSS

FB2

VHI

0.1µF

C 6

2.5µH

39.2

C 5

1µF

1mF

C10

0.22µF

C11

(Optional)

D4*

1V*(1+R3/R4)

OUT =

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