View STLA01_4343032.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 10 A max supply current in shutdown mode DFN6 (2 x 2 mm) package
DFN6 (2 x 2 mm)
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 A.
Table 1.
Device summary
Part number STLA01 Order code STLA01PUR Package DFN6 (2x2 mm)
November 2007
Rev 1
1/16
www.st.com 18
Contents
STLA01
Contents
1 2 3 4 5 6 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1 6.2 6.3 6.4 VCC pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 EN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 8 9
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16
STLA01
Diagram
1
Figure 1.
Diagram
Block diagram
3/16
Pin configuration
STLA01
2
Figure 2.
Pin configuration
Pin connections (top view)
Table 2.
Pin n 1 2 3 4 5 6 Exposed Pad
Pin description
Symbol GND NC LED VCC PROG EN GND Ground Not connected This pin provide an accurate output limited current. In shutdown mode no current can flow to the LED. Input supply voltage. The input range is from 3.75 V to 6 V. Current limitation program. (1) Enable pin. Tie to VCC if unused. To be connected to PCB ground plane for optimal electrical and thermal performance. Name and function
1. The PROG pin is a high impedance pin, It is possible to connect only the programming resistor.
4/16
STLA01
Maximum ratings
3
Table 3.
Maximum ratings
Absolute maximum ratings
Parameter Input supply voltage LED pin voltage PROG pin voltage EN pin voltage LED pin current PROG pin current LED short-circuit duration PD TJ TSTG TOP TL Power dissipation Max junction temperature Storage temperature range Operating junction temperature range Lead temperature (10 sec) Value From -0.3 to 7 From -0.3 to 7 From -0.3 to 3 From -0.3 to 7 80 800 Continuous Internally limited 125 -65 to 125 -40 to 85 260 (JEDEC 020C) C C C C Unit V V V V mA A
Symbol VCC VLED VPROG VEN ILED IPROG
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Thermal data
Parameter Thermal resistance junction-ambient Value 100 (1) Unit C/W
Table 4.
Symbol RthJA
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.
Symbol ESD
ESD performance
Parameter ESD protection voltage MM (EIA/JESD22/A115) 200 V Test conditions HBM (EIA/JESD22/A114) Value 3 Unit kV
5/16
Application
STLA01
4
Figure 3.
Application
Typical application
VCC CIN
4
VCC
LED
3
ILED
STLA01
6 PROG EN GND 1 5 RPROG
OFF ON
6/16
STLA01
Electrical characteristics
5
Table 6.
Symbol VCC
Electrical characteristics
Electrical characteristics (VCC = VEN = 5 V, CIN = 1 F, TJ = -40 to 85C unless otherwise specified)
Parameter Supply voltage RPROG = 2.4 k ICC Supply current RPROG = 6.2 k (1)
(1)
Test conditions
Min. 3.75
Typ.
Max. 6 750 300
Unit V
A 200 5 2 47.5 19 9.5 50 20 10 0 1.22 1.22 1.22 0.3 0.92 120 2 8 1.2 V mV M V 52.5 21 10.5 1 A mA 10 mA
RPROG =12.4 k
Shutdown mode VEN = GND ILED-MIN Minimum LED pin current , Current mode RPROG=65 k VLED=3 V Current mode RPROG=2.4 k , VLED=3 V Current mode RPROG=6.2 k , VLED=3 V (1) Current mode RPROG=12.4 k , VLED=3 V (1) Shutdown mode VEN=GND, TJ = 25 C RPROG = 2.4 k VPROG PROG pin voltage RPROG = 6.2 k (1) k (1)
ILED
LED pin current
RPROG = 12.4 EN threshold high VEN REN RON EN hysteresis EN pin input resistance Power FET ON resistance (between VCC and LED)
VCC = 3.75 V to 6 V VEN = 5 V ILED = 50 mA
1. Guaranteed by design, but not tested in production.
7/16
Application information
STLA01
6
Application information
The STLA01 is a single LED driver using a constant-current topology. It can deliver up to 80 mA of output current. If a 1% program resistor is connect from the PROG pin to the GND pin and the EN pin is higher than 0.92 V, the device will supply the LED with the programmed constant current. Putting the EN pin below 0.80 V results in no current flow into the LED diode.
6.1
VCC pin
A positive input supply voltage provides power to the driver. VCC can range from 3.75 V to 6 V and should be bypassed with at least a 1 F capacitor. In shutdown mode, the ILED = 0.
6.2
EN pin
The enable input pin is used to shut down the device when the value of the pin is below 0.80 V. In shutdown condition, the device has less than 10 A supply current. The enable pin has an internal pull down (REN). If unused, the pin should be tied to VCC.
6.3
Programming charge current
The LED current is programmed using a single resistor from the PROG pin to ground. The LED current is 100 times the current out of the PROG pin. The program resistor and the led current are calculated using, in first approximation, the following equations: RPROG = 100 x (1.22 V / ILED)
6.4
Power dissipation
A good thermal PCB layout is very important to maximize the available output current. The thermal path for the heat generated by the IC is from the die to the copper lead frame through the package leads and exposed pad to the PC board copper. The PC board copper acts as the heat sink. The copper pad footprints should be as wide as possible and expand to larger copper areas in order to spread and dissipate the heat to the surrounding ambient. Feed-through vias to inner or backside copper layers are also useful in improving the overall thermal performance of the device. Other heat sources on the board, not related to the device, must also be considered when designing a PC board layout because they will affect overall temperature rise and the maximum output current.
8/16
STLA01
Typical performance characteristics
7
Figure 4.
55 54 53 52 51 50 49 48 47 46 45
-50
Typical performance characteristics
LED pin current vs temperature Figure 5.
25 24 23 22 21 20 19 18 17 16 15
-50
LED pin current vs temperature
VEN=VCC=5 V, CIN=1 F , VLED=3 V, RPROG=2.4 kohm
VEN=VCC=5 V, CIN=1 F, VLED=3 V, RPROG=6.2 kohm
ILED [mA]
ILED [mA]
-25
0
25
50
75
100
-25
0
25
50
75
100
T [C]
T [C]
Figure 6.
15 14 13 12 11 10 9 8 7 6 5
-50
LED pin current vs temperature
Figure 7.
LED pin current vs RPROG
VEN=VCC=5 V, CIN=1 F, VLED=3 V, RPROG=12.4 kohm
60
VEN=VCC=5 V, CIN=1 F, VLED=3 V, T= -40 C to 85 C
50
ILED [mA]
ILED [mA]
40 30 20 10 0
0 10 20 30 40 50 60 70
-25
0
25
50
75
100
T [C]
RPROG [kohm]
Figure 8.
Supply current vs temperature
Figure 9.
Supply current vs RPROG
800 700 600
ICC [ A]
RPROG=2.4 kohm RPROG=6.2 kohm RPROG=12.4 kohm
VEN=VCC=5 V, CIN=1 F, VLED=3 V
600
VEN=VCC=5 V, CIN=1 F, VLED=3 V, T= -40 C to 85 C
500
ICC [A]
500 400 300 200 100 0
-50 -25 0 25 50
400 300 200 100 0
0 10 20 30
RPROG [kohm]
75
100
40
50
60
T [C]
9/16
Typical performance characteristics
STLA01
Figure 10. PROG pin voltage vs temperature
Figure 11. PROG pin voltage vs RPROG
1.4
VEN=VCC=5 V; CIN=1 F ; VLED=3 V, T = -40 C to 85 C
1.26 1.25 1.24
VPROG [V]
VEN=VCC=5 V, CIN=1 F, VLED=3 V
1.35 1.3
VPROG [V]
1.23 1.22 1.21 1.2 1.19 1.18
-50 -25 0 25 50 75 100
RPROG=2.4 kohm RPROG=6.2 kohm RPROG=12.4 kohm
1.25 1.2 1.15 1.1 1.05 1
0 10 20 30 40 50 60 70
T [C]
RPROG [kohm]
Figure 12. Enable pin voltage vs temperature
Figure 13. Enable pin input resistance vs temperature
6
1.4 1.2 1
VEN [V]
VCC=5 V; CIN=1 F; VLED=3 V
VEN=5 V, VCC=5 V, CIN=1 F, VLED=3 V
5
REN [Mohm]
4 3 2
0.8 0.6 0.4 0.2 0
-50 -25 0 25 50
T [C]
ON OFF
1
150
75
100
125
0
-50 -25 0 25
T [C]
50
75
100
Figure 14. RON vs temperature
14
VEN=VCC=5 V, CIN=1 F, ILED=50 mA
12
RON [Ohm]
10 8 6 4 2 0
-50 -25 0 25 50 75 100
T [C]
10/16
STLA01
Package mechanical data
8
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level lnterconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
11/16
Package mechanical data
STLA01
DFN6 (2x2 mm) mechanical data
mm. Dim. Min. A A1 A3 b D D2 E E2 e L 0.30 0.20 1.90 1.22 1.90 0.41 0.70 0 Typ. 0.75 0.02 0.20 0.25 2.00 1.37 2.00 0.56 0.50 0.40 0.50 11.8 0.32 2.10 1.47 2.10 0.66 7.9 74.8 48.0 74.8 16.1 Max. 0.80 0.05 Min. 27.6 0.0 Typ. 29.5 0.8 7.9 9.8 78.7 53.9 78.7 22.0 19.7 15.7 19.7 12.6 82.7 57.9 82.7 26.0 Max. 31.5 2.0 inch.
7733060B
12/16
STLA01
Package mechanical data
Tape & reel QFNxx/DFNxx (2x2 mm) mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 2.3 2.3 1.0 4 8 12.8 20.2 60 14.4 0.091 0.091 0.039 0.157 0.315 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 Min. Typ. Max. 7.087 0.519 inch.
13/16
Package mechanical data
STLA01
Figure 15. DFN6 (2x2 mm) footprint recommended data
14/16
STLA01
Revision history
9
Table 7.
Date
Revision history
Document revision history
Revision 1 Initial release. Changes
27-Nov-2007
15/16
STLA01
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
(c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
16/16

▲Up To Search▲

Price & Availability of STLA01

	To Download STLA01 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .