Intersil Corporation EL7513IY-T7, EL7513IY-T13, EL7513IY, EL7513IWT-T7, EL7513IWT Datasheet

1

®

FN7112.2

EL7513

White LED Step-Up Regulator

The EL7513 is a constant current
boost regulator specially designed for

driving white LEDs. It can drive 4
LEDs in series or up to 12 LEDs in parallel/series
configuration and achieves efficiency up to 91%.

The brightness of the LEDs is adjusted through a voltage
level on the CNTL pin. When the level falls below 0.1V, the
chip goes into shut-down mode and consumes less than
1µA of supply current for V

IN

less than 5.5V.

The EL7513 is available in the 8-pin TSOT and 8-pin MSOP
packages. The TSOT package is just 1mm high, compared
to 1.45mm for the standard SOT23 package.

Features

• 2.6V to 13.2V input voltage

• 18V maximum output voltage

• Drives up to 12 LEDs

• 1MHz switching frequency

• Up to 91% efficiency

• 1µA maximum shut-down current

• Dimming control

• 8-pin TSOT and 8-pin MSOP packages

Applications

•PDAs

• Cellular phones

• Digital cameras

• White LED backlighting

Ordering Information

PAR T

NUMBER PACKAGE

TAPE &

REEL PKG. DWG. #

EL7513IWT 8-Pin TSOT - MDP0049

EL7513IWT-T7 8-Pin TSOT 7” MDP0049

EL7513IWT-T13 8-Pin TSOT 13” MDP0049

EL7513IY 8-Pin MSOP - MDP0043

EL7513IY-T7 8-Pin MSOP 7” MDP0043

EL7513IY-T13 8-Pin MSOP 13” MDP0043

Pinouts Typical Connection

EL7513

(8-PIN TSOT)

TOP VIEW

EL7513

(8-PIN MSOP)

TOP VIEW

COMP

CNTL

VOUT

LX

VIN

CS

SGND

PGND

1

2

3

4

8

7

6

5

CS

VIN

PGND

SGND

CNTL

COMP

LX

VOUT

1

2

3

4

8

7

6

5

C

1

LXVIN

VOUT

CS

PGND

SGND

CNTL

COMP

4.7µF

C

3

0.1µF

C

2

1µF

L

33µH

D

2.6V TO

5.5V

R

1

V

CTRL

5Ω

Data Sheet July 2003

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

1-888-INTERSIL or 321-724-7143

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

Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.

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

2

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

J

= TC = T

A

Absolute Maximum Ratings (T

A

= 25°C)

COMP, CNTL, CS to SGND. . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V

V

IN

to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+14V

V

OUT

to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+19V

LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+20V

SGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V

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

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

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. This part is ESD sensitive. Handle with care.

Electrical Specifications V

IN

= 3V, VO = 12V, C1 = 4.7µF, L = 33µH, C2 = 1µF, C3 = 0.1µF, R1 = 5Ω, TA = 25°C,

Unless Otherwise Specified

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

V

IN

Input Voltage 2.6 13.2 V

I

Q1

Total Input Current at Shut-down V

CNTL

= 0V 1 µA

I

Q1

Quiescent Supply Current at VO Pin V

CNTL

= 1V, load disconnected 1 1.5 mA

I

COMP

COMP Pin Pull-up Current COMP connected to SGND 11 20 µA

V

COMP

COMP Voltage Swing 0.5 1.5 2.5 V

I

CNTL

CNTL Shut-down Current CNTL = 0V 1 µA

V

CNTL1

Chip Enable Voltage 240 mV

V

CNTL2

Chip Disable Voltage 100 mV

I

OUT_ACCURACYVCNTL

= 1V V

CNTL

= 1V 14 15 16 mA

V

OUT1

Over-voltage Threshold V

OUT

rising 17 18 19 V

V

OUT2

Over-voltage Threshold V

OUT

falling, with resistive load 15 16 17.5 V

ILX MOSFET Current Limit 500 mA

R

DS_ON

MOSFET On-resistance 0.7 Ω

I

LEAK

MOSFET Leakage Current V

CNTL

= 0V, VLX = 12V 1 µA

F

S

Switching Frequency 800 1000 1200 kHz

D

MAX

Maximum Duty Ratio V

CNTL

= 2V, IS = 0 85 90 %

I

CS

CS Input Bias Current 1µA

∆I

O

/∆V

IN

Line Regulation VIN = 2.6V - 5.5V 0.03 %/V

Pin Descriptions

8-PIN TSOT 8-PIN MSOP PIN NAME DESCRIPTION

1 7 COMP Compensation pin. A compensation cap (4700pF to 1µF) is normally connected between this pin and

SGND.

2 8 CNTL Control pin for dimming and shut-down. A voltage between 250mV and 5.5V controls the brightness,

and less than 100mV shuts down the converter.

3 5 VOUT Output voltage sense. Use for over voltage protection.

4 6 LX Inductor connection pin. The drain of internal MOSFET.

5 3 PGND Power Ground pin. The source of internal MOSFET.

6 4 SGND Signal Ground. Ground pin for internal control circuitry. Needs to connect to PGND at only one point.

7 1 CS Current sense pin. Connect to sensing resistor to set the LED bias current.

8 2 VIN Power supply for internal control circuitry.

EL7513

3

Block Diagram

REFERENCE
GENERATOR

1MHz

OSCILLATOR

THERMAL

SHUTDOWN

BOOST

I-SENSE

START-UP
CONTROL

+
+

-

+

+

PWM

SIGNAL

C

OUT

1µF

I(LED)

OVER-VOLTAGE

PROTECTION

ERROR AMP

CNTL

COMP

V

IN

C

IN

4.7µF

C

COMP

0.1µF

SGND

C

S

PGND

LX

V

OUT

L

33µH

2.6V TO

5.5V

5Ω

V

CNTL

PWM

LOGIC

617K

50K

Typical Performance Curves

All performance curves and waveforms are taken with C1 = 4.7µF, C2 = 1µF, C3 = 0.1µF, L = 33µF, V

IN

= 3.3V, V

CNTL

= 1V, R1=5Ω, 4 LEDs in a

series; unless otherwise specified.

FIGURE 1. SWITCHING FREQUENCY vs V

IN

FIGURE 2. QUIESCENT CURRENT

1.05

1.04

1.02

1.01

1

2.5 3.5 4.5

V

IN

(V)

F

S

(MHz)

1.03

5.5345

3.5

2

1

0

2.5 6.5 10.5

V

IN

(V)

I

IN

(µA)

3

14.54.5 8.5 12.5

2.5

1.5

0.5

V

CNTL

=0V, 0.1V

WHITE LEDs DISCONNECTED

EL7513

4

FIGURE 3. I

LED

vs V

CNTL

FIGURE 4. I

LED

vs V

IN

FIGURE 5A. 2 LEDs IN A SERIES FIGURE 5B. EFFICIENCY vs I

O

FIGURE 5.

FIGURE 6A. 3 LEDs IN A SERIES FIGURE 6B. EFFICIENCY vs I

O

FIGURE 6.

Typical Performance Curves (Continued)

All performance curves and waveforms are taken with C

1

= 4.7µF, C2 = 1µF, C3 = 0.1µF, L = 33µF, V

IN

= 3.3V, V

CNTL

= 1V, R1=5Ω, 4 LEDs in a

series; unless otherwise specified.

0

5

10

15

20

25

30

35

0 0.5 1 1.5 2 2.5

V

CNTL

(V)

I

LED

(mA)

14

14.2

14.4

14.6

14.8

15

15.2

15.4

15.6

15.8

16

2.53.54.55.5
V

IN

(V)

V

CNTL

=1V

I

LED

(mA)

34

5

LXVIN

VOUT

CS

PGND

SGND

CNTL

COMP

4.7µF

0.1µF

1µF

L

33µH

BAT54HT1

V

IN

25

16

3

7

48

V

CTRL

5Ω

2 LEDs IN A SERIES

90

85

80

75

70

5 1015202530

I

O

(mA)

EFFICIENCY (%)

L=COILCRAFT LPO1704-333CM

VIN=4.2V

VIN=2.7V

LXVIN

VOUT

CS

PGND

SGND

CNTL

COMP

4.7µF

0.1µF

1µF

L

33µH

BAT54HT1

V

IN

25

16

3

7

48

V

CTRL

5Ω

3 LEDs IN A SERIES

90

85

80

75

70

5 1015202530

I

O

(mA)

EFFICIENCY (%)

L=COILCRAFT LPO1704-333CM

VIN=4.2V

VIN=2.7V

EL7513