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ISL6406IR Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL6406IR Datasheet(HTML) 7 Page - Intersil Corporation |
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7 / 18 page  7 FN9073.7 January 16, 2007 Pin Descriptions CPVOUT - This pin represents the output of the charge pump. The voltage at this pin is the bias voltage for the IC. Connect a decoupling capacitor from this pin to ground. The value of the decoupling capacitor should be at least 10x the value of the charge pump capacitor. This pin may be tied to the bootstrap circuit as the source for creating the BOOT voltage. CT1 and CT2 - These pins are the connections for the external charge pump capacitor. A minimum of a 0.1 μF ceramic capacitor is recommended for proper operation of the IC. OCSET - Connect a resistor (ROCSET) from this pin to the drain of the upper MOSFET (VIN). ROCSET, an internal 20μA current source (IOCSET), and the upper MOSFET on-resistance (rDS(ON)) set the converter overcurrent (OC) trip point according to Equation 1: An overcurrent trip cycles the soft-start function. VOUT - This pin provides the external switcher output voltage to the IC as feedback for the 1.8V fixed output voltage option. Leave this pin open on the ISL6406 for the adjustable output voltage option. VCC - This pin provides bias supply for the ISL6406. Connect a well-coupled 3.3V supply to this pin. PHASE - Connect this pin to the upper MOSFET’s source. This pin is used to monitor the voltage drop across the upper MOSFET for overcurrent protection. RT - Connect an external resistor from this pin to ground for frequency selection. Refer to RT vs Frequency curve of Figure 3. BOOT - This pin provides ground referenced bias voltage to the upper MOSFET driver. A bootstrap circuit is used to create a voltage suitable to drive a logic-level N-Channel MOSFET. A large (~1M Ω) resistor should be connected from this pin to GND. The purpose of this resistor is to discharge the BOOT pin during a shutdown condition, SYNC/EN = LOW so that the gate drivers are quickly powered off by this bleed resistor. UGATE - Connect this pin to the upper MOSFET’s gate. This pin provides the PWM-controlled gate drive for the upper MOSFET. This pin is also monitored by the adaptive shoot- through protection circuitry to determine when the upper MOSFET has turned off. GND - This pin represents the signal and power ground for the IC. Tie this pin to the ground island/plane through the lowest impedance connection available. LGATE - Connect this pin to the lower MOSFET’s gate. This pin provides the PWM-controlled gate drive for the lower MOSFET. This pin is also monitored by the adaptive shoot- through protection circuitry to determine when the lower MOSFET has turned off. COMP and FB - COMP and FB are the available external pins of the error amplifier. The FB pin is the inverting input of the internal error amplifier and the COMP pin is the error amplifier output. These pins are used to compensate the control feedback loop of the converter. CPGND - This pin represents the signal and power ground for the charge pump. Tie this pin to the ground island/plane through the lowest impedance connection available. SYNC/EN - This is a dual-function pin. To synchronize with an external clock, apply a clock with a frequency 1.1 to 2.0 times higher than the part’s natural frequency to this pin. The device may be disabled by tying this pin to ground. In this shutdown mode, all functions are disabled and the device will draw <50 μA supply current. I PEAK I OCSET () R OCSET () r DS ON () -------------------------------------------------------- = (EQ. 1) ISL6406 |
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Similar Description - ISL6406IR |
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