STLA01PUR ,50 mA stand-alone linear LED driverPin configuration Figure 2. Pin connections (top view)Table 2. Pin descriptionPin n° Symbol Name a ..
STLC1502D ,STLC1502Block diagram.......45 System Overview .45.1 ARM7 domain .....45.2 D950 domain.......55.3 Clocks .. ..
STLC2150 ,BLUETOOTH RADIO TRANSCEIVERElectrical characteristics, rated for the operating rangeSymbol Parameter Min Max UnitV High Level ..
STLC2415 ,BLUETOOTH BASEBAND WITH INTEGRATED FLASHAbsolute Maximum RatingsSymbol Conditions Min Max UnitV Supply voltage baseband core V 0.5 2.5 VDD ..
STLC3055 ,WLL & ISDN-TA SUBSCRIBER LINE INTERFACE CIRCUITAbsolute Maximum RatingsSymbol Parameter Value UnitV Positive Supply Voltage -0.4 to +13 VposA/BGND ..
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SY10E151JI , 6-BIT D REGISTER
SY10E157JCTR , QUAD 2:1 MULTIPLEXER
SY10E166JC , 9-BIT MAGNITUDE COMPARATOR
SY10E167JC , 6-BIT 2:1 MUX-REGISTER
SY10E171JC , 3-BIT 4:1 MULTIPLEXER
SY10E171JC , 3-BIT 4:1 MULTIPLEXER
STLA01PUR
50 mA stand-alone linear LED driver
STLA0150 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 µA max supply current in shutdown mode DFN6 (2 x 2 mm) package
DescriptionThe 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
Contents STLA01
Contents Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86.1 VCC pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.2 EN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.3 Programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.4 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
STLA01 Diagram
1 Diagram
Figure 1. Block diagram
Pin configuration STLA01 Pin configuration
Figure 2. Pin connections (top view)
Table 2. Pin description The PROG pin is a high impedance pin, It is possible to connect only the programming resistor.
STLA01 Maximum ratings
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 3. Absolute maximum ratings
Table 4. Thermal data 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
Application STLA01
4 Application
Figure 3. Typical application
STLA01 Electrical characteristics
5 Electrical characteristics
Table 6. Electrical characteristics (VCC = VEN = 5 V, CIN = 1 µF, TJ = -40° to 85°C unless otherwise
specified) Guaranteed by design, but not tested in production.
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 V CC 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 µF 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 µA 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.
