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High-Performance Power ICs and Hall-Effect Sensors
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Datasheets:
A6276: 16-Bit Serial-Input, Constant-Current Latched LED Driver (PDF)
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Power Integrated Circuits,
LED Display Drivers,
Relay/Solenoid Drivers
Technical Publications:
Constant-Current LED Drivers (PDF)
FAQs:
6276: 16-Bit Serial-Input, Constant-Current Latched LED Driver FAQ
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Serial-Input Latched LED Drivers with Programmable Constant-Current Outputs
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FAQs - A6276 16-Bit Serial-Input, Constant-Current
Latched LED Driver 
Q1: What package options are offered for the A6276?
Q2: Do I need any external components?
Q3: Does the A6276 come with any type of protection circuitry?
Q4: Can the output current be controlled with an external voltage?
Q5: What if I want to multiplex and need source drivers as well as sink drivers?
Q6: Is a resistor required in series with the LEDs?
Q7: What if I need more than 16 bits?
Q8: Is there an applications note for the A6276?
Q9: What is the power rating requirement for REXT?
Q10: Is the A6276EA a drop-in replacement for the Toshiba TD62706BN?
Q11: Is the A6276ELW a drop-in replacement for the Toshiba TD62706BF?
Q1: What package options are offered for the A6276?
The A6276EA and A6276SA are packaged in a 24-pin DIP. The A6276ELW and A6276SLW are packaged in a 24-pin SOIC.
Q7: Do I need any external components?
Yes. an external resistor sets the load current per bit and establishes the output current for all 16 sink drivers.
Q8: Does the A6276 come with any type of protection circuitry?
Yes. Under-voltage lockout (UVLO)
Q4: Can the output current be controlled with an external voltage?
Yes. Although an external resistor is still required, output current can be controlled with an external voltage. For more details on how this is done, please refer to the Constant Current LED Drivers application note (AN29503.1, PDF).
Q5: What if I want to multiplex and need source
drivers as well as sink drivers?
Multiplexing is possible using a device such as Allegro's UCN5891
8-bit source driver. Please refer to the Constant
Current LED Drivers application note (AN29503.1, PDF).
Q6: Is a resistor required in series with the LEDs?
No, but depending on the application, a series resistor may be needed
if it is necessary to minimize the voltage drop across the transistor
in order to minimize device power dissipation.
Q7: What if I need more than 16 bits?
No problem. This device is designed to be cascaded with additional
A6276s by connecting the SERIAL DATA OUT pin to the SERIAL DATA IN
pin of the next device.
Q8: Is there an applications note for the A6276?
Yes. Constant Current LED
Drivers application note (AN29503.1, PDF).
Q9: What is the power rating requirement for REXT?
REXT should be rated for at least 1/8th watt.
Q10: Is the A6276EA a drop-in replacement for the
Toshiba TD62706BN?
No. Although both devices are functional equivalents and have identical
pinouts, the Toshiba TD62706BN is not in a JEDEC-standard DIP package
and therefore has a slightly different footprint.
Q11: Is the A6276ELW a drop-in replacement for
the Toshiba TD62706BF?
No. Although both devices are functional equivalents and have identical pinouts, the Toshiba TD62706BF is not in a JEDEC-standard SOIC package and therefore has a slightly different footprint.