intersil EL7556D DATA SHEET

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Data Sheet August 1, 2005

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EL7556D

FN7339.1

Integrated Adjustable 6 Amp
Synchronous Switcher

The EL7556D is an adjustable synchronous DC:DC
switching regulator optimized for a 5V input and 1.0V-3.8V
output. By combining integrated NMOS power FETS with a
fused-lead package, the EL7556D can supply up to 6A
continuous output current without the use of external power
devices or discrete heat sinks, thereby minimizing design
effort and overall system cost.

On-chip resistorless current sensing is used to achieve
stable, highly efficient, current-mode control. The EL7556D
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 on­board sensor monitors die temperature (OT) for over­temperature 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 EL7556D is available in a 28-pin SO package and is
specified for operation over the full -40°C to +85°C
temperature range.

Ordering Information

PART

NUMBER PACKAGE

EL7556DCM 28-Pin SO - MDP0027

EL7556DCM-T13 28-Pin SO 13” MDP0027

EL7556DCMZ
(See Note)

EL7556DCMZ-T13
(See Note)

NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.

28-Pin SO

(Pb-free)

28-Pin SO

(Pb-free)

TAPE &

REEL PKG. DWG. #

- MDP0027

13” MDP0027

Features

• Improved temperature and voltage ranges

• 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

• Pb-free plus anneal available (RoHS compliant)

Applications

• 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

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright Intersil Americas Inc. 2003, 2005. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

Pinout

EL7556D

EL7556D

(28-PIN SO)

TOP VIEW

1

2

3

4

5

6

7

8 21

9

10

11

12

13

14 15

28

FB2FB1

27

CPCREF

26

C2VCSLOPE

25

VSSCOSC

VHIVDD

24

LXVIN

23

LXVSSP

22

LXVIN

LXVSSP

20

VSSPVSSP

19

VSSPVSSP

18

TESTVSSP

17

PWRGDVCC2DET

16

OTOUTEN

2

EL7556D

Absolute Maximum Ratings (T

Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C

Supply (V

Output Pins . . . . . . . . . . . . . . .-0.3V below GND, +0.3V above V

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: T

). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0V

IN

Electrical Specifications V

DD

= 25°C)

A

= V

= 5V, C

IN

= TC = T

J

= 1nF, C

OSC

A

DD

SLOPE

Ambient Operating Temperature . . . . . . . . . . . . . . . . -40°C to +85°C

Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 135°C

Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9A

= 470pF, TA = 25°C, unless otherwise specified.

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

GENERAL

I

DD

I

DDOFF

I

VIN

V

OUT1

V

OUT2

V

OUTLINE

V

OUTLOAD

VDD Supply Current OUTEN = 4V, F

= 120kHz 11 25 mA

OSC

VDD Standby Current OUTEN = 0 0.1 mA

V

No Load Current OUTEN = 0 3 5 mA

IN

Output Initial Accuracy VCC2DET = 4V, IL = 3A (see Fig. 1) 3.450 3.500 3.550 V

Output Initial Accuracy VCC2DET = 0V, IL = 3A, R3 = 150Ω, R4 =

2.450 2.500 2.550 V

100Ω (see Fig. 1)

Output Line Regulation VDD = 5V, ±10% -1 1 %

Output Load Regulation 0A < I

< 6A, relative to IL = 3A,

LOAD

-1 1 %

continuous mode of operation (see Fig.1)

R

SHORT

I

I MAX

V

OUTTC

T

OT

T

HYS

V

PWRGD

V

DDOFF

V

DDON

V

HYS

M

SS

D

MAX

Short Circuit Load Resistance IL = 6A, prior to continuous application of

R

, OUTEN connected to OT

SHORT

100 mΩ

Current Limit 9A

Output Tempco -40°C < TA < 85°C ±1 %

Over-temperature Threshold 135 °C

Over-temperature Hysteresis 40 °C

Power Good Threshold Relative to
Programmed Output Voltage

VCC2SEL = 4V, V

= 3.50V ±6 ±10 ±14 %

OUT

Minimum VDD for Shutdown 3.15 V

Maximum VDD for Startup 4.15 V

Input Hysteresis V

HYS

= V

DDON

- V

DDOFF

0.5 V

Soft-start Slope 7V/ms

Maximum Duty Cycle 96 %

CONTROLLER - INPUTS

I

PUP

I

CSLOPE

VCC2DET, OUTEN Pull-up Current VCC2DET, OUTEN = 0 10 14 18 µA

C

Charging Current 23 28.5 34 µA

SLOPE

IFB1 FB1 Input Pull-up Current 2µA

R

OT

V

IH

V

IL

V

OH PWGD

V

OL PWGD

Over-temperature Pull-up Resistance OT = 0V 30 40 50 kΩ

VCC2DET, OUTEN Input High 4 V

VCC2DET, OUTEN Input Low 0.8 V

Powergood Drive High I

Powergood Drive Low I

= 1mA 3.5 V

LOAD

= -1mA 1.0 V

LOAD

CONTROLLER - REFERENCE

V

REF

Reference Accuracy I

= 0 1.247 1.260 1.273 V

REF

3

EL7556D

Electrical Specifications V

DD

= V

= 5V, C

IN

OSC

= 1nF, C

= 470pF, TA = 25°C, unless otherwise specified. (Continued)

SLOPE

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

REFTC

V

REFLOAD

Reference Voltage Tempco 50 ppm/°C

Reference Load Regulation 0 < I

< 100µA 0.5 0.5 %/°C

LOAD

CONTROLLER - DOUBLER

VC2V Voltage Doubler Output V

DD

= 5V, I

= 10mA 7.5 8.1 8.7 V

LOAD

CONTROLLER - OSCILLATOR

F

RAMP

I

OSC CHG

I

OSC DIS

F

OSC

t

SYNC

Oscillator Ramp Amplitude 1.2 V

Oscillator Charge Current 0.2V < V

Oscillator Discharge Current 0.2V < V

< 1.4V 150 µA

OSC

< 1.4V 5 mA

OSC

Oscillator Initial Accuracy 105 125 145 kHz

Minimum Oscillator Sync Width 50 ns

POWER - FET

I

LEAK

R

DSON

R

DSONTC

t

BRM

t

LEB

LX Output Leakage to V

SS

LX = 0V 100 µA

Composite FET Resistance 18 30 mΩ

R

Tempco 0.1 mΩ/°C

DSON

FET Break Before Make Delay 10 ns

High Side FET Minimum on Time (LEB) 140 ns

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