ST STLA01 User Manual

Features

■ Programmable LED current up to 50 mA with ±

5% accuracy

■ No external sense resistor

■ Constant current source

■ Supply voltage range from 3.75 V to 6 V

■ Single LED

■ 10 µA max supply current in shutdown mode

■ DFN6 (2 x 2 mm) package

Description

The STLA01 is a constant current LED driver.

No external sense resistor is required and the
DFN6 2 x 2 mm package makes it ideal for
portable applications.

STLA01

50 mA stand-alone linear

LED driver

DFN6 (2 x 2 mm)

The LED current limitation can be programmed
using a single resistor connected between the
PROG pin and GND. Using the enable pin the
device can be put into shutdown mode, reducing
the supply current to less than 10 µA.

Table 1. Device summary

Part number Order code Package

STLA01 STLA01PUR DFN6 (2x2 mm)

November 2007 Rev 1 1/16

www.st.com

18

Contents STLA01

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6.1 VCC pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6.2 EN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6.3 Programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6.4 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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STLA01 Diagram

1 Diagram

Figure 1. Block diagram

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Pin configuration STLA01

2 Pin configuration

Figure 2. Pin connections (top view)

Table 2. Pin description

Pin n° Symbol Name and function

1 GND Ground

2 NC Not connected

3LED

4VCCInput supply voltage. The input range is from 3.75 V to 6 V.

5 PROG Current limitation program.

6 EN Enable pin. Tie to VCC if unused.

Exposed

Pad

1. The PROG pin is a high impedance pin, It is possible to connect only the programming resistor.

GND

This pin provide an accurate output limited current. In shutdown mode no current
can flow to the LED.

(1)

To be connected to PCB ground plane for optimal electrical and thermal
performance.

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STLA01 Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

V

V

PROG

V

I

LED

I

PROG

CC

LED

EN

Input supply voltage From -0.3 to 7 V

LED pin voltage From -0.3 to 7 V

PROG pin voltage From -0.3 to 3 V

EN pin voltage From -0.3 to 7 V

LED pin current 80 mA

PROG pin current 800 µA

LED short-circuit duration Continuous

Power dissipation Internally limited

Max junction temperature 125 °C

Storage temperature range -65 to 125 °C

Operating junction temperature range -40 to 85 °C

Lead temperature (10 sec) 260 (JEDEC 020C) °C

T

P

T

D

T

J

STG

OP

T

L

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these conditions is not implied.

Table 4. Thermal data

Symbol Parameter Value Unit

R

thJA

1. This value depends on whether the exposed backside of the package is soldered to the PC board. If it is not, the value
could be considerably higher.

Thermal resistance junction-ambient 100

(1)

°C/W

Table 5. ESD performance

Symbol Parameter Test conditions Value Unit

HBM (EIA/JESD22/A114) 3 kV

ESD ESD protection voltage

MM (EIA/JESD22/A115) 200 V

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