ELANT EL7558BCM-T13 Datasheet

EL7558BC

Integrated Adjustable 8 Amp Synchronous Switcher

EL7558BC

Features

• EL7558C/EL7558AC pin-

compatible

• Improved temperature and voltage

ranges

• 8A 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

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

Ordering Information

Part No Package

EL7558BCM 28-Pin HSOP - MDP0042

EL7558BCM-T13 28-Pin HSOP 13” MDP0042

Tape &

Reel Outline #

General Description

The EL7558BC 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 HSOP package the EL7558BC can supply up to 8A continuous output current without the use of external power devices or externally attached 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 EL7558BC 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 3.50V 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 monitors 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 EL7558BC is available in the 28-pin HSOP package and is specified for operation over the -40°C to +85°C temperature range.

Connection Diagram

R4 R3

D4*

(Optional)

C10

1mF

C11

0.22µF

OUT

R5 R6

5.1

Ω

660µF

1µF

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 EL7558ACM only

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

100

Ω

0.1µF

220pF

C12

1µF

Connect to VSSP for

external feedback

150

Ω

330pF

FB1

CREF

CSLOPE

COSC

VDD

VIN

VSSP

VIN

VSSP

VCC2DET

OUTEN

VSSP

TEST

PWRGD

FB2

C2V

VSS

VHI

1514

C 5

1µF

Ω

C 6

39.2

Ω

0.1µF

2.5µH

EL7558BC

April 27, 2001

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.

EL7558BC

Integrated Adjustable 8 Amp Synchronous Switcher

EL7558BC

Absolute Maximum Ratings (T

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

Supply (VIN) 6V

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

= 25°C)

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

Operating Junction Temperature 135°C

Peak Output Current 9A

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: TJ = TC = TA.

Electrical Characteristics

= VIN = 5V, C

Parameter Description Conditions Min Typ Max Unit

General

DDOFF

VIN

OUT1

OUT2

OUTLINE

OUTLOAD

SHORT

I MAX

OUTTC

HYS

PWRGD

DDOFF

DDON

HYS

MAX

Controller - Inputs

PUP

CSLOPE

FB1

VOH

PWGD

OL PWGD

Controller - Reference

REF

REFTC

REFLOAD

= 1nF, C

OSC

VDD Supply Current OUTEN = 4V, F

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

SLOPE

= 120kHz 11 25 mA

OSC

VDD Standby Current OUTEN = 0 0.1 mA

No Load Current OUTEN = 0 3 5 mA

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 =

100Ω (See Fig. 1)

2.450 2.500 2.550 V

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

Output Load Regulation 0A<I

Short Circuit Load Resistance IL = 6A Prior to Continuous Application of

<6A, Relative to IL = 3A. Continu-

LOAD

ous Mode of Operation (See Fig.1)

. OUTEN Connected to OT.

SHORT

-1 1 %

100 mΩ

Current Limit 9 A

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-VDDOFF

0.5 V

Soft start slope 7 V/ns

Maximum duty cycle 96 %

VCC2DET, OUTEN Pull Up Current VCC2DET, OUTEN = 0 10 14 18 µA

Cslope Charging Current 23 28.5 34 µA

FB1 Input Pull Up Current 2 µA Over Temperature Pull Up Resistance OT = 0V 30 40 50 kΩ

VCC2DET, OUTEN Input High 4 V

VCC2DET, OUTEN Input Low .8 V

Powergood Drive High ILoad = 1mA 3.5 V

Powergood Drive Low ILoad = -1mA 1.0 V

Reference Accuracy I

= 0 1.247 1.260 1.273 V

REF

Reference Voltage Tempco 50 ppm/ºC

Reference Load Regulation 0<I

<100µA 0.5 0.5 %/ºC

LOAD

EL7558BC

Integrated Adjustable 8 Amp Synchronous Switcher

Electrical Characteristics

= VIN = 5V, C

Parameter Description Conditions Min Typ Max Unit

Controller - Doubler

C2V

Controller - Oscillator

RAMP

OSC CHG

OSC DIS

OSC

sync

Power - FET

LEAK

DSON

DSONTC

brm

LEB

= 1nF, C

OSC

Voltage Doubler Output V

Oscillator Ramp Amplitude 1.2 V

Oscillator Charge Current 0.2V<V

Oscillator Discharge Current 0.2V<V

Oscillator initial accuracy 100 120 140 kHz

Minimum oscillator sync width 50 ns

LX Output Leakage to VSS LX = 0V 100 µA Composite FET Resistance 18 30 mΩ

Tempco 0.1 mΩ/ºC

DSON

FET break before make delay 10 ns

High side FET minimum on time (LEB) 140 ns

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

SLOPE

= 5V, I

= 10mA 7.5 8.1 8.7 V

LOAD

<1.4V 150 µA

OSC

<1.4V 5 mA

OSC

EL7558BC

Integrated Adjustable 8 Amp Synchronous Switcher

EL7558BC

Typical Performance Curves

Efficiency vs I

LOAD

=3.5V)

OUT

Efficiency (%)

VDD=5V

VDD=5.5V

VDD=4.5V

0.5 2.5 3.5 5.5 6.5 7.51.5 4.5

Line Regulation (C

SLOPE

OUT

=150pF)

(A)

3.54

TA=25°C

3.53

=0.5A

3.52

3.51

(V)

OUT

3.50

3.49

OUT

=8A

OUT

3.48

3.47

4.5 5.0 5.5

VIN (V)

=4A

TA=25°C

Efficiency vs I

LOAD

(VDD=5.0 V)

100

=3.5V

OUT

=2.5V

OUT

Efficiency (%)

=1V

OUT

TA=25°C

8.0

0.5 2.5 3.5 5.5 6.5 7.51.5 4.5

Load Regulation (C

SLOPE

OUT

(A)

8.0

=150pF)

3.54

3.53

3.52

VIN=5.5V

3.51

(V)

3.50

OUT

3.49

VIN=5V

VIN=4.5V

3.48

3.47 TA=25°C

3.46

0.5 3 861 2 4 5 7

(A)

OUT

Line Regulation vs C VDD=VIN=5.0V ±10%

0.8

0.7

0.6

0.5

(±) (%)

0.4

OUT

0.3

∆V

0.2

0.1

0.0 50 75

SLOPE

OUT

=3.5V

OUT

=2.5V

OUT

=1V

OUT

100 125 150 175

(pF)

SLOPE

=3A)

TA=25°C

Load Regulation vs C I

OUT

0.6

0.5

0.4

(±) (%)

0.3

OUT

∆V

0.2

=0.5 to 6A

OUT

=3.5V

SLOPE (VIN

=5.0V)

OUT

TA=25°C

=2.5V

=1V

0.1

0.0 50 75

100 125 150 175

(pF)

SLOPE

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