Catalyst Semiconductor, Inc., a provider of analog, mixed-signal and non-volatile memory, announces the introduction of the new 4-channel LDD (Low Dropout LED Driver) device, the CAT4004, which is specifically designed for use in emerging power-sensitive portable devices. Driving LED applications.
As the forward voltage of white LEDs is further reduced, a large number of portable applications are beginning to use a way to directly drive the LEDs from the system battery, rather than boosting and then driving the battery voltage. Designed specifically for this new application, the CAT4004 has a dropout voltage of only 130mV, and the CAT4004 maximizes the LED's performance requirements when the system's battery voltage drops significantly.
Even with LEDs with different forward voltages, the CAT4004 LDD can achieve positive/negative 5% accurate current matching, and the CAT4004 LDD can also program the LED current through the single-wire EZDim interface. The system microcontroller uses only one pin. Output on/off and LED brightness adjustment. The CAT4004 can be adjusted to 6 levels of LED current: 100%, 50%, 25%, 12.5%, 6% and 3%.
Features
Includes four precisely matched LED current channels
The chip has a voltage difference of only 130mV when the load is 30mA.
No switching noise
Each LED has an independent control loop
Set the maximum LED current by an external resistor
Control LED brightness with single-line EZDim interface
Overheat protection, standby current less than 1uA
Package: 8-pin TDFN, 2mm × 3mm
Supply and price
The CAT4004 low dropout LED driver is priced at $0.52 per unit in 10,000 units and samples are available now. The delivery time of the production is expected to be 6-8 weeks after the order is received.
Source: Electronic Engineering
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