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RT8259A Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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RT8259A Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 11 page RT8259A 2 DS8259A-02 March 2011 www.richtek.com Function Block Diagram Functional Pin Description Pin No. Pin Name Pin Function 1 PHASE Switch Output. 2 VIN Supply Voltage. The RT8259 operates from a 4.5V to 24V unregulated input. C1 is needed to prevent large voltage spikes from appearing at the input. 3, 7 NC No Internal connection. 4 EN Chip Enable (Active High). If the EN pin is open, it will be pulled to high by internal circuit. 5 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pins sets the output voltage. 6 GND Ground. This pin is the voltage reference for the regulated output voltage. For this reason, care must be taken in its layout. This node should be placed outside of the D1 to C1 ground path to prevent switching current spikes from inducing voltage noise into the part. 8 BOOT Bootstrap. A capacitor is connected between PHASE and BOOT pins to form a floating supply across the power switch driver. This capacitor is needed to drive the power switch‘s gate above the supply voltage. VOUT 1.2V 1.8V 2.5V 3.3V 5V 8V 10V 15V L1 ( μH) 2 2 3.6 4.7 6.8 10 10 15 R2 (k Ω) 100 39 24 16 8.2 5.23 4.42 2.61 R1 (k Ω) 49.9 48.7 51 49.9 43 47 51 46.4 Recommended Component Selection Driver R Q S Bootstrap Control + - Ramp Generator Oscillator 1.4MHz + - PWM Comparator EA Reference Regulator + - 1V 1µA + - 400k 30pF 1pF Shutdown Comparator OC Limit Clamp Current Sense Amp X20 25mOhm BOOT GND FB EN VIN PHASE 10k 3V |
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