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CAT4004A Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT4004A Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 11 page © Semiconductor Components Industries, LLC, 2011 June, 2011 − Rev. 2 1 Publication Order Number: CAT4002A/D CAT4002A, CAT4004A Constant Current LED Driver with 32 Dimming Levels and Rset Description The CAT4002A and CAT4004A provide respectively two and four matched low dropout current sources to drive LEDs. The CAT400XA uses an external resistor RSET to set the current in the LED channels. Each LED channel includes an individual control loop allowing the device to handle a wide range of LED forward voltages while still maintaining tight current matching. The EN/DIM logic inputs supports device enable and a digital dimming interface for setting the LED channel current with 32 linear dimming levels. LEDs can be powered directly from a Lithium−ion battery due to the low dropout (50 mV at 20 mA) current sinks. The device is available in the tiny 8−pad UDFN 2 mm x 2 mm package with a max height of 0.55 mm, as well as the 6−lead TSOT−23 and SC−70. Features • 2 and 4 LED Current Sinks with Tight Matching • 32 Dimming Levels • Low Dropout Driver 50 mV at 20 mA • No Switching Noise • Shutdown Current less than 1 mA • LED Current set by External Resistor • Dimming via 1−wire EZDimt Interface • Thermal Shutdown Protection • 6−lead TSOT−23, SC−70, and 8−pad UDFN 2 mm x 2 mm Packages • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications • LCD Display Backlight • Digital Still Cameras • Cellular Phones • Handheld Devices Figure 1. Typical Application Circuit CAT4004A VIN EN/DIM RSET GND LED1 LED2 LED3 LED4 RSET 3.74 kW One wire programming 20 mA 1 mF 2.4 V to 5.5 V CIN VIN http://onsemi.com ORDERING INFORMATION SC70−6 SD SUFFIX CASE 419AD TSOT23−6 TD SUFFIX CASE 419AF UDFN−8 HU2G SUFFIX CASE 517AW PIN CONNECTIONS CAT4004A UDFN−8 VIN RSET LED4 LED3 EN/DIM GND LED1 LED2 1 1 RSET LED2 EN/DIM GND VIN LED1 CAT4002A TSOT23−6 1 GND LED2 VIN RSET LED1 EN/DIM CAT4002A SC70−6 (Top Views) See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. |
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