National Semiconductor LM3590 Technical data

LM3590
Series White LED Driver

LM3590 Series White LED Driver

November 2003

General Description

The LM3590 is a White LED constant current driver capable
of supplying up to 3 White LEDs connected in series with
20mA. This device operates over a wide 6V-12.6V input
voltage range. The output can accomodate LEDs with a
combined forward voltage of up to 11.5V, from a 12V input
supply. The LED drive current is programmed by using an
external resistor on the I

LED brightness can be linearly varied up to the programmed
LED current by applying a Pulse Width Modulated (PWM)
signal to the EN pin of the device. The LED output current of
the LM3590 is tightly controlled over temperature and volt­age. LED Current matching is guaranteed due to the series
configuration of the LEDs. The series topology also simpli­fies the connection between the White LEDs in the display
module and the LM3590 since only one connection is re­quired.

The LM3590 typically draws only 50µA when operating in the
no-load condition and draws less than 0.1µA when the de­vice is shut down.

The LM3590 is available in a small 5-pin SOT23 package.

SET

pin.

Typical Application Circuit

Features

n Drives up to 3 stacked white LEDs
n 6.0V-12.6V input voltage range
n Up to 20mA LED output current
n Excellent LED current matching guaranteed by series

configuration

n Single connection to the White LEDs in the display

module

n Tightly controlled programmable current source
n Low shutdown current (0.1µA typ.)
n PWM brightness control
n Very small solution size
n SOT23-5 package: 3mm x 3mm x 1.0mm (LxWxH)

Applications

n White LED Display Backlights
n Keypad Backlights
n General purpose constant current driver for high

forward-voltage LEDs

20081301

20081305

© 2003 National Semiconductor Corporation DS200813 www.national.com

Connection Diagram

LM3590

Ordering Information

Order Number Package Description Package Marking Supplied As

LM3590MF SOT23-5 SABB

LM3590MFX SOT23-5 SABB

Pin Description

#

Pin

1I

2 GND Ground Connection

3I

4V

5 EN Device Enable

20081302

¢Z¢1¢

*

¢Z¢1¢

*

Name Function

SET

Programmable LED current Input. The LED current has the following relationship with the
resistor used:

OUT

= 100 x (125 ÷ I

R

SET

Constant Current LED Output

IN

Power Supply Voltage Input. Input voltage range: 6V-12.6V

OUT

)

Tape and Reel

X 250 Units, Tape

and Reel

X 3000 Units, Tape

and Reel

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LM3590

Absolute Maximum Ratings (Notes 1,

2)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

V

IN

EN −0.3 to (V

−0.3 to 13.0V Max

+0.3V) w/

IN

13.0V max

Operating Conditions

Input Voltage Range 6.0V to 12.6V

EN Voltage Range 0V to V

Ambient Temperature (TA)
Range
(Note 4)

Junction Temperature (T
Range

)

J

−40˚C to +85˚C

−40˚C to +110˚C

Maximum Junction Temperature

) 150˚C

(T

JMAX

Storge Temperature −65˚C to +150˚C

Maximum Lead Temperature

260˚C

(Soldering, 5 sec.)

ESD Rating (Note 3)

Thermal Information

Junction-to-Ambient Thermal
Resistance,
SOT23-5 Package (θ

) (Note 5) 220˚C/W

JA

Human Body Model 1.5kV

Machine Model 200V

Electrical Characteristics (Notes 2, 6)

Limits in standard typeface are for TJ= 25˚C and limits in boldface type apply over the full Operating Junction Temperature
Range (−40˚C ≤ T

≤ +110˚C). Unless otherwise specified, CIN= 1 µF, VIN= 12.0V, VEN= 3.0V, R

J

10.8V.

Symbol Parameter Conditions Min Typ Max Units

I

OUT

Output Current Capability VIN= 12V

7.5V ≤ V

V

= 10.8V

IOUT

11.3V ≤ V

R

= 8.35kΩ 15

SET

R

= 12.5kΩ 10

SET

IOUT

IN

≤ 11.5V

≤ 12.6V

19

(−5%)

19

(−5%)

Output Current Programming 125 ÷

I

ratio to I

OUT

I

Q

I

SD

V

ISET

V

HR

Quiescent Supply Current 11.3V ≤ VIN≤ 12.6V

Shutdown Supply Current VIN= 12.6V

I

Reference Voltage 1.25 V

SET

Minimum Current Source
Voltage Headroom (V
V

IOUT

V

IH

V

IL

I

EN

t

ON

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics table.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: The human-body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 220pF capacitor discharged

directly into each pin.

Note 4: Maximum ambient temperature (T
dissipation of the device in the application (P
following equation: T
outside the listed T

Note 5: Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues. For more information on these topics, please refer to the Power Dissipation section of this datasheet.

Logic Input EN: High level 1.1 V

Logic Input EN: Low level 0 0.3 V

Enable Pin Input Current(Note 8) 6 µA

Turn-On Time I

A-MAX=TJ-MAX-OP

rating, so long as the junction temperature of the device does not exceed the maximum operating rating of 110oC.

A

)(Note 7)

SET

= OPEN

R

SET

= OPEN

I

OUT

=0V

V

EN

= 95% nominal 300 mV

I

OUT

−

IN

= 90% of steady state 50 µs

OUT

) is dependent on the maximum operating junction temperature (T

A-MAX

), and the junction-to-ambient thermal resistance of the part/package in the application (θJA), as given by the

D-MAX

-(θJAxP

). The ambient temperature operating rating is provided merely for convenience. This part may be operated

D-MAX

J-MAX-OP

= 6.19kΩ,V

SET

IOUT

20 21

(+5%)

20 21

(+5%)

R

SET

100:1

50 75 µA

0.1 1 µA

IN

=110oC), the maximum power

IN

=

mA

A

V

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