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ISL6524ACBZ Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL6524ACBZ Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 16 page 6 FN9064.1 April 8, 2005 Functional Pin Descriptions VCC (Pin 28) Provide a 12V bias supply for the IC to this pin. This pin also provides the gate bias charge for all the MOSFETs controlled by the IC. The voltage at this pin is monitored for Power-On Reset (POR) purposes. GND (Pin 17) Signal ground for the IC. All voltage levels are measured with respect to this pin. PGND (Pin 24) This is the power ground connection. Tie the synchronous PWM converter’s lower MOSFET source to this pin. VAUX (Pin 16) Connect this pin to the ATX 3.3V output. The voltage present at this pin is monitored for sequencing purposes. This pin provides the necessary base bias for the NPN pass transistors, as well as the current sunk through the 5k Ω VID pull-up resistors. SS13 (Pin 13) Connect a capacitor from this pin to ground. This capacitor, along with an internal 28 µA current source, sets the soft-start interval of the synchronous switching converter (VOUT1) and the AGP regulator (VOUT3). A VTTPG high signal is also delayed by the time interval required by the charging of this capacitor from 0V to 1.25V (see Soft-Start details). SS24 (Pin 12) Connect a capacitor from this pin to ground. This capacitor, along with an internal 28 µA current source, sets the soft-start interval of the VOUT2 regulator. Pulling this pin below 0.8V induces a chip reset (POR) and shutdown. VTTPG (Pin 9) VTTPG is an open collector output used to indicate the status of the VOUT2 regulator output voltage. This pin is pulled low when the VOUT2 output is below the under- voltage threshold or when the SS13 pin is below 1.25V. PGOOD (Pin 8) PGOOD is an open collector output used to indicate the status of the output voltages. This pin is pulled low when the synchronous regulator output is not within ±10% of the DACOUT reference voltage or when any of the other outputs is below its under-voltage threshold. VID3, VID2, VID1, VID0, VID25 (Pins 3-7) VID3-25 are the TTL-compatible input pins to the 5-bit DAC. The logic states of these five pins program the internal voltage reference (DACOUT). The level of DACOUT sets the microprocessor core converter output voltage (VOUT1), as well as the corresponding PGOOD and OVP thresholds. Each VID pin is connected to the VAUX pin through a 5k Ω pull-up resistor. OCSET (Pin 23) Connect a resistor (ROCSET) from this pin to the drain of the upper MOSFET. ROCSET, an internal 200µA current source (IOCSET), and the upper MOSFET’s on-resistance (rDS(ON)) set the converter over-current (OC) trip point according to the following equation: An over-current trip cycles the soft-start function. The voltage at OCSET pin is monitored for power-on reset (POR) purposes. PHASE (Pin 26) Connect the PHASE pin to the PWM converter’s upper MOSFET source. This pin represents the gate drive return current path and is used to monitor the voltage drop across the upper MOSFET for over-current protection. UGATE (Pin 27) Connect UGATE pin to the PWM converter’s upper MOSFET gate. This pin provides the gate drive for the upper MOSFET. LGATE (Pin 25) Connect LGATE to the synchronous PWM converter’s lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. COMP and FB (Pins 20, 21) COMP and FB are the available external pins of the synchronous PWM regulator error amplifier. The FB pin is the inverting input of the error amplifier. Similarly, the COMP pin is the error amplifier output. These pins are used to compensate the voltage-mode control feedback loop of the synchronous PWM converter. VSEN1 (Pin 22) This pin is connected to the synchronous PWM converters’ output voltage. The PGOOD and OVP comparator circuits use this signal to report output voltage status and for over- voltage protection. DRIVE2 (Pin 1) Connect this pin to the gate/base of a N-type external pass transistor (MOSFET or bipolar). This pin provides the drive for the 1.2V regulator’s pass transistor. VSEN2 (Pin 11) Connect this pin to the output of the standard buck PWM regulator. The voltage at this pin is regulated to a 1.2V level. This pin is also monitored for under-voltage events. FIX (Pin 2) Grounding this pin bypasses the internal resistor dividers that set the output voltage of the 1.5V and 1.8V linear regulators. IPEAK IOCSET ROCSET × rDS ON () ---------------------------------------------------- = |
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