Low Dropout LED Drivers for Battery Operated Devices

CAT4004 from Catalyst Semiconductor is a four-channel Low Dropout Driver (LDD), LED drivers, designed for battery operated portables devices. Life battery voltage is proportional to the sum of the LED driver dropout  and LED forward voltages. The CAT4004 LED driver package offer a low dropout voltage (130mV) which maximizes LED performance as system battery voltage decays.

Catalyst’s CAT4004 Low Dropout LED Drivers

The CAT4004 LED driver provides four matched low dropout current sources. Each LED channel has individual control. The EN/DIM inputs supports device enable and a digital dimming interface for current setting of all LEDs. Six different current dimming ratios are available. It is required that the battery or voltage source have enough headroom to drive the LED forward voltage and current sink (>150mV).

Application of CAT4004 Low Dropout LED driver includes: LCD Display Backlight, Digital Still Cameras, Cellular Phones, Handheld Devices, and other portable battery operated devices.

Key feature of CAT4004 Low Dropout LED driver:

• Low Dropout Driver 130mV at 30mA
• Four LED current sinks with tight matching
• Shutdown current < 1μA
• LED current set by external resistor
• Dimming via 1-wire EZDim™ interface
• Thermal shutdown protection

Catalyst also offers LED programming tool via Catalyst’s one-wire EZDim interface, which allows LED dimming control and output enable/disable.

Catalyst also has the CAT3644 for application required lower operating voltages.

CAT4004 low dropout LED driver is shiped in 8-lead 2mm x 3mm TDFN package. The price is $0.52 each (10K lot).

Source: CAT4004 4-Channel Constant Current LED Driver with EZDim - Catalyst