intersil EL7564 DATA SHEET

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Data Sheet May 9, 2005

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EL7564

FN7297.3

Monolithic 4 Amp DC/DC Step-Down Regulator

The EL7564 is an integrated, full-featured synchronous stepdown regulator with output voltage adjustable from 1.0V to

3.8V. It is capable of delivering 4A continuous current at up to 95% efficiency. The EL7564 operates at a constant frequency pulse width modulation (PWM) mode, making external synchronization possible. Patented on-chip resistorless current sensing enables current mode control, which provides cycle-by-cycle current limiting, over-current protection, and excellent step load response. The EL7564 features power tracking, which makes the start-up sequencing of multiple converters possible. A junction temperature indicator conveniently monitors the silicon die temperature, saving the designer time on the tedious thermal characterization. The minimal external components and full functionality make this EL7564 ideal for desktop and portable applications.

The EL7564 is specified for operation over the -40°C to +85°C temperature range.

Typical Application Diagrams

EL7564

[20-PIN SO (0.300”)]

TOP VIEW

C5

0.1µF

1

VREF

C4

390pF

R4

C3

22Ω

0.22µF

C2

2.2nF

V

IN

5V

C1

330µF

2

3

4

5

6

7

8

9

10

SGND

COSC

VDD

VTJ

PGND

VIN

STP

STN

EN

FB

PG

VDRV

VHI

LX

PGND

20

19

18

17

16

15

14

13

12

11

C6

0.22µF

L1

4.7µH

330µF

C7

D1

3.3V, 4A

R2

2.37kΩ

R1 1kΩ

V

OUT

C10

100pF

Features

• Integrated synchronous MOSFETs and current mode controller

• 4A continuous output current

• Up to 95% efficiency

• 4.5V to 5.5V input voltage

• Adjustable output from 1V to 3.8V

• Cycle-by-cycle current limit

• Precision reference

• ±0.5% load and line regulation

• Adjustable switching frequency to 1MHz

• Oscillator synchronization possible

• Internal soft start

• Over voltage protection

• Junction temperature indicator

• Over temperature protection

• Under voltage lockout

• Multiple supply start-up tracking

• Power good indicator

• 20-pin SO (0.300”) package

• 28-pin HTSSOP package

• Pb-Free available (RoHS compliant)

Applications

• DSP, CPU core and IO supplies

• Logic/Bus supplies

• Portable equipment

• DC/DC converter modules

• GTL + Bus power supply

Typical Application Diagrams continued on page 3

Manufactured Under U.S. Patent No. 5,7323,974

1

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

1-888-INTERSIL or 1-888-352-6832

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

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

Ordering Information

EL7564

TAPE &

PART NUMBER PACKAGE

EL7564CM 20-Pin SO (0.300”) - MDP0027

EL7564CM-T13 20-Pin SO (0.300”) 13” MDP0027

EL7564CMZ (See Note)

EL7564CMZ-T13 (See Note)

EL7564CRE 28-Pin HTSSOP - MDP0048

EL7564CRE-T7 28-Pin HTSSOP 7” MDP0048

EL7564CRE-T13 28-Pin HTSSOP 13” MDP0048

EL7564CREZ (See Note)

EL7564CREZ-T7 (See Note)

EL7564CREZ-T13 (See Note)

NOTE: Intersil Pb-free 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.

20-Pin SO (0.300”)

(Pb-free)

20-Pin SO (0.300”)

(Pb-free)

28-Pin HTSSOP

(Pb-free)

28-Pin HTSSOP

(Pb-free)

28-Pin HTSSOP

(Pb-free)

REEL

13” MDP0027

7” MDP0048

13” MDP0048

PKG. DWG.

#

- MDP0027

- MDP0048

2

FN7297.3

May 9, 2005

EL7564

Absolute Maximum Ratings (T

Supply Voltage between V V

Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .VIN +0.3V

LX

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V, V

V

Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V, V

HI

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. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = T

or VDD and GND . . . . . . . . . . . . +6.5V

IN

DC Electrical Specifications V

= 25°C)

A

DD

LX

= V

= 5V, TA = TJ = 25°C, C

IN

+0.3V

+6.5V

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

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

Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . +135°

A

= 1.2nF, Unless Otherwise Specified.

OSC

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

REF

V

REFTC

V

REFLOAD

V

RAMP

I

OSC_CHG

I

OSC_DIS

I

VDD+VDRV

IVDD_OFF V

V

DD_OFF

V

DD_ON

T

OT

T

HYS

I

LEAK

I

LMAX

R

DSON

R

DSONTC

I

STP

I

STN

Reference Accuracy 1.24 1.26 1.28 V

Reference Temperature Coefficient 50 ppm/°C

Reference Load Regulation 0 < I

< 50µA -1 %

REF

Oscillator Ramp Amplitude 1.15 V

Oscillator Charge Current 0.1V < V

Oscillator Discharge Current 0.1V < V

VDD+V

DD

Supply Current VEN = 4V, F

DRV

Standby Current EN = 0 1 1.5 mA

< 1.25V 200 µA

OSC

< 1.25V 8 mA

OSC

= 120kHz 2 3.5 5 mA

OSC

VDD for Shutdown 3.5 3.9 V

VDD for Startup 44.35V

Over Temperature Threshold 135 °C

Over Temperature Hysteresis 20 °C

Internal FET Leakage Current EN = 0, LX = 5V (low FET), LX = 0V (high FET) 10 µA

Peak Current Limit 5 A

FET On Resistance Wafer level test only 30 60 mΩ

R

Tem p c o 0.2 mΩ/°C

DSON

Auxiliary Supply Tracking Positive Input Pull Down Current

Auxiliary Supply Tracking Negative

V

STP

STN

= V

/ 2 -4 2.5 µA

IN

= V

/ 2 2.5 4 µA

IN

Input Pull Up Current

V

PGP

V

PGN

V

PG_HI

V

PG_LO

V

OVP

V

FB

Positive Power Good Threshold With respect to target output voltage 6 14 %

Negative Power Good Threshold With respect to target output voltage -14 -6 %

Power Good Drive High I

= +1mA 4 V

PG

Power Good Drive Low IPG = -1mA 0.5 V

Over Voltage Protection 10 %

Output Initial Accuracy (EL7564CM) I

Output Initial Accuracy

= 0A 0.960 0.975 0.99 V

LOAD

0.977 0.992 1.007 V

(EL7564CRE)

V

FB_LINE

V

FB_LOAD

V

FB_TC

I

FB

V

EN_HI

V

EN_LO

I

EN

Output Line Regulation V

Output Load Regulation 0.5A < I

Output Temperature Stability -40°C < TA < 85°C, I

Feedback Input Pull Up Current V

= 5V, ∆VIN = 10%, I

IN

< 4A 0.5 %

LOAD

= 0V 100 200 nA

FB

= 0A 0.5 %

LOAD

= 2A ±1 %

EN Input High Level 3.2 4 V

EN Input Low Level 1 V

Enable Pull Up Current VEN = 0 -4 -2.5 µA

3

FN7297.3

May 9, 2005

EL7564

Closed-Loop AC Electrical Specifications V

= V

= 5V, TA = TJ = 25°C, C

S

IN

= 1.2nF, Unless Otherwise Specified.

OSC

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

F

OSC

t

SYNC

M

SS

t

BRM

t

LEB

D

MAX

Oscillator Initial Accuracy 105 117 130 kHz

Minimum Oscillator Sync Width 25 ns

Soft Start Slope 0.5 V/ms

FET Break Before Make Delay 15 ns

High Side FET Minimum On Time 150 ns

Maximum Duty Cycle 95 %

Typical Application Diagrams (Continued)

EL7654

(28-PIN HTSSOP)

TOP VIEW

C5

0.1µF

1

VREF

C4

390pF

R4

22Ω

C2

2.2nF

V

IN

5V

C3

0.22µF

2

3

4

5

6

7

8

SGND

COSC

VDD

VTJ

PGND

EN

FB

PG

VDRV

VHI

LX

28

27

26

25

24

23

22

21

C6 D1

0.22µF

L1

4.7µH

C7 R2 C10

330µF

2.37kΩ

V

OUT

3.3V, 4A

100pF

PGND

330µF

9

VIN

10

11

VIN

12

NC

STP

13

STN

4

LX

NC

PGND

20

19

18

17

16

1514

R1 1kΩ

FN7297.3

May 9, 2005

Pin Descriptions

EL7564

20-PIN SO

(0.300”)

28-PIN

HTSSOP PIN NAME PIN FUNCTION

1 1 VREF Bandgap reference bypass capacitor; typically 0.1µF to SGND

2 2 SGND Control circuit negative supply or signal ground

3 3 COSC Oscillator timing capacitor (see performance curves)

4 4 VDD Control circuit positive supply; normally connected to VIN through an RC filter

5 5 VTJ Junction temperature monitor; connected with 2.2nF to 3.3nF to SGND

6, 7 6, 7, 8, 9 PGND Ground return of the regulator; connected to the source of the low-side synchronous NMOS

power FET

8 10, 11 VIN Power supply input of the regulator; connected to the drain of the high-side NMOS power FET

9 13 STP Auxiliary supply tracking positive input; tied to regulator output to synchronize start up with a

second supply; leave open for stand alone operation; 2µA internal pull down current

10 14 STN Auxiliary supply tracking negative input; connect to output of a second supply to synchronize

start up; leave open for stand alone operation; 2µA internal pull up current

11, 12, 13 15, 16 PGND Ground return of the regulator; connected to the source of the low-side synchronous NMOS

power FET

14, 15 18, 19, 20, 21,

22, 23

LX Inductor drive pin; high current output whose average voltage equals the regulator output

voltage

16 24 VHI Positive supply of high-side driver; boot strapped from VDRV to LX with an external 0.22µF

capacitor

17 25 VDRV Positive supply of low-side driver and input voltage for high side boot strap

18 26 PG Power good window comparator output; logic 1 when regulator output is within ±10% of target

output voltage

19 27 FB Voltage feedback input; connected to external resistor divider between VOUT and SGND; a

125nA pull-up current forces VOUT to SGND in the event that FB is floating

20 28 EN Chip enable, active high; a 2µA internal pull up current enables the device if the pin is left open;

a capacitor can be added at this pin to delay the start of converter

Typical Performance Curves

VIN=5V

100

95

90

85

80

75

EFFICIENCY (%)

70

65

60

043.532.5210.5 1.5

FIGURE 1. EL7564CM EFFICIENCY FIGURE 2. EL7564CRE EFFICIENCY

VO=2.8V

VO=1.8V

LOAD CURRENT I

5

O

(A)

VO=3.3V

VIN=5V

100

95

90

85

80

75

EFFICIENCY (%)

70

65

60

0.1 0.6 1.1 1.6 2.1 2.6 3.1 3.6 4.1

VO=2.5V

(A)

I

O

VO=3.3V

VO=1.8V

FN7297.3

May 9, 2005

EL7564

Typical Performance Curves (Continued)

VIN=5V

2

1.6

1.2

0.8

POWER LOSS (W)

0.4

0

043.532.5210.5 1.5

OUTPUT CURRENT I

VO=3.3V

VO=2.8V

(A)

O

VO=1.8V

FIGURE 3. EL7564CM TOTAL CONVERTER POWER LOSS FIGURE 4. EL7564CRE TOTAL CONVERTER POWER LOSS

1.8

1.6

1.4

I

O

VO=3.3V

(A)

1.2

1

(W)

0.8

LOSS

P

0.6

0.4

0.2

0

00.511.522.533.54

VO=1.8V

=3.3V

V

O

3.325

3.315

3.305

3.295

OUTPUT VOLTAGE (V)

3.285

3.275

0.5 43.532.51.512

LOAD CURRENT I

VIN=5.5V

VIN=5V

VIN=4.5V

(A)

O

VO=3.3V

1.5

1

0.5

0

(V) (%)

O

V

-0.5

-1

-1.5 01234

VIN=4.5V

VIN=5V

VIN=5.5V

I

(A)

O

FIGURE 5. EL7564CM LOAD REGULATION FIGURE 6. EL7564CRE LOAD REGULATION

CONDITION:

EL7564RE THERMAL PAD SOLDERED TO 2-LAYER TEST CONDITION: CHIP IN THE CENTER OF COPPER AREA

50

46

42

38

34

THERMAL RESISTANCE (°C/W)

30

141.5 2.5 3.5

PCB COPPER HEAT-SINKING AREA (in

FIGURE 7. EL7564CM θ

WITH 100 LFPM AIRFLOW

1 OZ. COPPER PCB USED

23

JA

WITH NO AIRFLOW

2

)

vs COPPER AREA FIGURE 8. EL7564CRE THERMAL RESISTANCE vs PCB

PCB WITH 0.039” THICKNESS AND 1 OZ. COPPER

ON BOTH SIDES

50

45

40

(°C/W)

JA

35

θ

30

25

11.5 33.54

22.5

PCB AREA (in

2

AREA - NO AIRFLOW

)

6

FN7297.3

May 9, 2005