RT9284B-20GJ6E Richtek USA Inc, RT9284B-20GJ6E Datasheet
RT9284B-20GJ6E
Specifications of RT9284B-20GJ6E
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RT9284B-20GJ6E Summary of contents
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Tiny Package, High Performance, Constant Current Switching Regulator for White LED General Description The RT9284A compact, high efficient and high integration LED driver. Internal 22V MOSFET can support White LEDs for backlighting and camera flashing. ...
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... Figure 1. Application for Driving 3 Series WLEDs L1 4.7uH to 22uH + C1 1uF RT9284 6 VDD OVP 2 100Hz-100kHz GND FB Figure 2. Application for Driving 4 Series WLEDs L1 4.7uH to 22uH C1 1uF RT9284B 6 LX VDD 4 EN OVP 2 100Hz-100kHz GND FB Figure 3. Application for Driving 5 Series WLEDs L1 4.7uH to 22uH C1 1uF RT9284A 6 1 VDD LX 4 ...
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Pin Description Pin No. Pin Name TSOT-23-5 TSOT-23 GND OVP 5 6 VDD Function Block Diagram VDD OVP EN DS9284A/B-06 June 2009 Switch Pin. Connect this Pin ...
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... Reference Voltage Feedback Voltage (Note 5) www.richtek.com 4 (Note 1) (Note 3) Symbol Test Condition 1.5V, No switch 0V, Switch < 0. 3.0~4. OSC RT9284A RT9284B − 65°C to 150°C − 40°C to 125°C − 40°C to 85°C Min Typ Max Units 2.7 -- 5.5 1.8 2.2 2.5 50 300 1000 0 ...
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Parameter MOSFET On Resistance of MOSFET Protection OVP Threshold OVP Sink Current OCP Shut Down Voltage Enable Voltage Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. ...
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RT9284A/B Typical Operating Characteristics Enable Voltage vs. Input Voltage 1.2 1.1 -45°C 1.0 25°C 0.9 85°C 0.8 0.7 0.6 0.5 3 3.25 3.5 3.75 4 Input Voltage (V) Efficiency vs. Input Voltage 20mA 4.7μH, DCR ...
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Switching Current vs. Input Voltage 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0 3.25 3.5 3.75 4 Input Voltage (V) Feedback Voltage vs. Temperature 252.2 252 251.8 251.6 251.4 251.2 251 250.8 250.6 -40 -30 -20 ...
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RT9284A/B Dimming Operation 4WLEDs 3.7V LED EN (5V/Div (100mA/Div) (10mA/Div) I LED Time (4μs/Div) Inrush Current 4WLEDs 3.0V LED (2V/Div) EN (2V/Div (5V/Div) V OUT I IN (100mA/Div) ...
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Normal Operation (5V/Div) (2V/Div) V OUT (10V/Div (100mA/Div) Time (400ns/Div) DS9284A/B-06 June 2009 4WLEDs 4. 20mA 10μH LED V OUT V RT9284A/B Normal Operation (5V/Div) (2V/Div) 4WLEDs, V ...
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... LED Current Control The RT9284A/B regulates the LED current by setting the current sense resistor (R1) connecting to feedback and ground. As shown in Table 1, the RT9284A feedback voltage ( 1.235V and the RT9284B feedback voltage 0.25V. The LED current (I FB resistor R1. In order to have an accurate LED current, a precision resistor is preferred (1% is recommended) ...
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L1 4.7uH to 22uH 2.7V to 5.5V RT9284A 6 1 VDD LX V > 1. OVP V < 0. GND FB 2.8V 0V Figure 7. Filtered PWM Signal for LED ...
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RT9284A/B Figure 10. Bottom Layer www.richtek.com 12 DS9284A/B-06 June 2009 ...
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Outline Dimension Symbol DS9284A/B-06 June 2009 Dimensions In Millimeters Min Max 0.700 1.000 0.000 0.100 1.397 1.803 0.300 0.559 2.591 3.000 2.692 3.099 0.838 ...
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RT9284A/B Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to ...