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ISL6527IRZ Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL6527IRZ Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 16 page  5 FN9056.10 November 18, 2008 Functional Pin Description 14 LD (SOIC) TOP VIEW 16 LD 5X5 (QFN) TOP VIEW VCC This pin provides the bias supply for the ISL6527, ISL6527A. Connect a well-decoupled 3.3V supply to this pin. COMP and FB COMP and FB are two of the three 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 voltage-control feedback loop of the converter. REF_IN This pin is the third available external pin of the error amplifier and represents the non-inverting input to the error amplifier. Connect the desired reference voltage to this pin. Voltage applied to this pin must not exceed 1.5V. 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. 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. 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. 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. 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. OCSET/SD 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. Pulling OCSET/SD to a voltage level below 0.8V disables the controller. Disabling the ISL6527, ISL6527A causes the oscillator to stop, the LGATE and UGATE outputs to be held low, and the soft-start circuitry to re-arm. CT1 and CT2 These pins are the connections for the external charge pump capacitor. A minimum of a 0.1µF ceramic capacitor is recommended for proper operation of the IC. 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. 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. 12 14 13 4 3 2 1 LGATE CPVOUT UGATE PHASE VCC BOOT GND CT1 11 7 6 5 9 8 10 CT2 OCSET/SD FB CPGND REF_IN COMP 1 3 4 15 CPVOUT CT1 CT2 OCSET/SD 16 14 13 2 12 10 9 11 6 57 8 PHASE VCC CPGND NC I PEAK I OCSETxROCSET r DS ON () ------------------------------------------------- = (EQ. 1) ISL6527, ISL6527A |
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