RT9379 RICHTEK [Richtek Technology Corporation], RT9379 Datasheet
RT9379
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RT9379 Summary of contents
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... The RT9379 channel WLED driver with auto mode selection of x1, x1.5 and x2 mode with low dropout voltage in current sources. The RT9379 can power white LEDs with regulated constant current for uniform intensity. Each channel (LED1 to LED6) can support up to 25mA. ...
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... VIN CF EN PGND AGND www.richtek.com FLY2 FLY1 1µF 1µF C1P C1N C2P C2N VIN PWM Input LED1 LED2 EN RT9379 LED3 VOUT LED4 LED5 OUT LED6 CF AGND PGND C CF 0.1µF C1P C1N C2P C2N 1MHz UVLO Gate Driver OSC Mode Decision ...
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... Current Sink for LED2. (If not in use, this pin should be connected to VIN) Current Sink for LED3. (If not in use, this pin should connected to VIN) The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. (Note 1) (Note 4) RT9379 Pin Function www.richtek.com 3 ...
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... RT9379 Electrical Characteristics (V = 3.6V 3.5V OUT Parameter Input Power Supply Input Supply Voltage Under-Voltage Lockout Threshold Under-Voltage Lockout Hysteresis Quiescent Current Shutdown Current LED Current LED Current Accuracy Current Matching Charge Pump Oscillator Frequency PWM Dimming Frequency Internal CF Resistance Mode Decision x1 Mode to x1 ...
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... Input Voltage (V) x2 Mode Quiescent Current vs. Input Voltage 4.5 4.0 3.5 3.0 2.5 2.0 2.8 3 3.2 3.4 3.6 3.8 4 Input Voltage (V) x1 Mode Inrush Current Response V = 3.2V IN Time (100μs/Div) RT9379 LED1 LED2 LED3 LED4 LED5 LED6 LED V = 3.02V F 4.2 4.4 4.6 4.8 5 4.2 4.4 4.6 4.8 5 www.richtek.com 5 ...
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... RT9379 x1.5 Mode Inrush Current Response V = 3.15V IN EN (5V/Div) V OUT (1V/Div) C2P (2V/Div (200mA/Div) Time (100μs/Div) PWM Dimming Operation V = 3.7V 56nF, Duty = 50 10kHz (2V/Div) I LED (10mA/Div) Time (250μs/Div) www.richtek.com 6 x2 Mode Inrush Current Response 3.1V ...
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... LED connection The RT9379 supports white LEDs. The 6 LEDs are connected from VIN to pin1 14, 15 and 16 respectively. If the LED is not used, the LED pin should be connected to VIN directly ...
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... Ambient Temperature (°C) Figure 1. Derating Curve for RT9379 Package Layout Considerations For best performance of the RT9379, the following layout guidelines should be strictly followed : Output Capacitor (C ) should be placed close to VOUT OUT and connected to ground plane to reduce noise coupling from charge pump to LEDs. ...
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... W-Type 16L QFN 2x3 Package Richtek Technology Corporation Taipei Office (Marketing) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com RT9379 1 2 DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0.028 ...