cat4139 Catalyst Semiconductor, cat4139 Datasheet
cat4139
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cat4139 Summary of contents
Page 1
... LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4139 is ideal for driving parallel strings five white LEDs in series 22V. LED dimming can be done by using a DC voltage, a logic signal pulse width modulation (PWM) signal ...
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... CAT4139 ABSOLUTE MAXIMUM RATINGS Parameters VIN, FB Voltage SHDN ¯¯¯¯¯ Voltage SW Voltage Storage Temperature Range Junction Temperature Range Lead Temperature RECOMMENDED OPERATING CONDITIONS Typical application circuit with external components are shown on page 1. Parameters VIN SW pin voltage (1) Ambient Temperature Range ...
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... Characteristics subject to change without notice Quiescent Current vs. VIN (Switching) 2.0 1.5 1.0 0.5 0.0 3.0 5.0 5.5 FB Pin Voltage vs. Output Current 310 305 300 295 290 100 150 Switch ON Resistance vs. Input Voltage 2.0 1.5 1.0 0.5 0.0 5.0 5.5 3 CAT4139 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE [V] 80 100 120 140 160 180 200 OUTPUT CURRENT [mA] 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE [V] Doc. No. MD-5032 Rev. A ...
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... CAT4139 TYPICAL CHARACTERISTICS V = 5.0V 180mA 25ºC, with typical application circuit unless otherwise specified. IN OUT AMB Output Current vs. Input Voltage 200 180 160 140 120 100 3.0 3.5 4.0 INPUT VOLTAGE [V] Efficiency vs. Output Current 100 120 140 160 180 200 OUTPUT CURRENT [mA] Power-up at 180mA Doc ...
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... VOUT = 14V 50 0 3.0 3.5 4.0 4.5 INPUT VOLTAGE [V] Switch Current Limit 900 VOUT = 9V 850 800 VOUT = 12V 750 700 650 600 4.5 4.7 4.9 INPUT VOLTAGE [V] © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5.0 5.5 5.1 5.3 5.5 5 CAT4139 Shutdown Voltage 1.0 -40°C -25°C 0.8 0.6 125°C 0.4 85°C 0.2 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] Doc. No. MD-5032 Rev. A ...
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... CAT4139 PIN DESCRIPTION VIN is the supply input for the internal logic. The device is compatible with supply voltages down to 2.8V and up to 5.5V recommended that a small bypass ceramic capacitor (4.7μF) be placed between the VIN and GND pins near the device. If the supply voltage drops below 1.9V, the device stops switching. ...
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... DEVICE OPERATION The CAT4139 is a fixed frequency (1MHz), low noise, inductive boost converter that provides a constant current with excellent line and load regulation. The device uses a high-voltage CMOS power switch between the SW pin and ground to energize the inductor. When the switch is turned off, the stored energy in the inductor is released into the load via the Schottky diode ...
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... CAT4139 OPEN LED PROTECTION In the event of an “Open LED” fault condition, the CAT4139 will continue to boost the output voltage with maximum power until the output voltage reaches approximately 24V. Once the output exceeds this level, the internal circuitry immediately places the device into a very low power mode where the total input power is limited to about 6mW (about 1 ...
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... Filtered PWM Signal A filtered PWM signal used as a variable DC voltage can control the LED current. Figure 2 shows the PWM control circuitry connected to the CAT4139 FB pin. The PWM signal has a voltage swing 2.5V. The LED current can be dimmed within a range from 0mA to 20mA. The PWM signal frequency can vary from very low frequency and up to 100kHz. ¯ ...
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... VIN pin and GND. The capacitor C2 has to be connected separately to the top LED anode. A ground plane under the CAT4139 allows for direct connection of the capacitors to ground. The resistor R1 must be connected directly to the GND pin of the CAT4139 and not shared with the switching current loops and any other components. D ...
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... All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-193. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice SYMBOL θ θ CAT4139 MIN NOM MAX 1.00 0.01 0.05 0.10 0.80 0.87 0.90 0.30 0.45 0.12 0.15 0.20 2.90 BSC 2.80 BSC 1.60 BSC 0.95 TYP 0.30 0.40 0.50 0.60 REF 0.25 BSC 0º ...
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... All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) The device used in the above example is a CAT4139–GT3 (TSOT-23, NiPdAu, Tape & Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. © Catalyst Semiconductor, Inc. ...
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... Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. ...