ST STLA01 User Manual

STLA01

50 mA stand-alone linear LED driver

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	DFN6 (2 x 2 mm)

■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.

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

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

3

LED

This pin provide an accurate output limited current. In shutdown mode no current

can flow to the LED.

4

VCC

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

5

PROG

Current limitation program. (1)

6

EN

Enable pin. Tie to VCC if unused.

Exposed

GND

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

Pad

performance.

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

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STLA01					Maximum ratings
3	Maximum ratings
Table 3.	Absolute maximum ratings
Symbol			Parameter		Value		Unit
VCC			Input supply voltage		From -0.3 to 7		V
VLED			LED pin voltage		From -0.3 to 7		V
VPROG			PROG pin voltage		From -0.3 to 3		V
VEN			EN pin voltage		From -0.3 to 7		V
ILED			LED pin current		80		mA
IPROG			PROG pin current		800		µA
			LED short-circuit duration		Continuous
PD			Power dissipation		Internally limited
TJ			Max junction temperature		125		°C
TSTG			Storage temperature range		-65 to 125		°C
TOP			Operating junction temperature range		-40 to 85		°C
TL			Lead temperature (10 sec)		260 (JEDEC 020C)		°C
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		Thermal resistance junction-ambient			100 (1)		°C/W
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.

	Table 5.	ESD performance
	Symbol	Parameter	Test conditions	Value	Unit
	ESD	ESD protection voltage	HBM (EIA/JESD22/A114)	3	kV
			MM (EIA/JESD22/A115)	200	V

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