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ISL6523EVAL1 Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL6523EVAL1 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 16 page 5 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 standard buck converter. 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 standard buck regulator output voltage. This pin is pulled low when the output is below the under-voltage threshold or when the SS13 pin is below 1.25V. LGATE Source ILGATE VCC = 12V, VLGATE1 = 1V - 1 - A LGATE Sink RLGATE VLGATE = 1V - 1.4 3.0 Ω PROTECTION VSEN1 Over-Voltage (VSEN1/DACOUT) VSEN1 Rising - 120 - % OCSET1,2 Current Source IOCSET VOCSET = 4.5VDC 170 200 230 µA Soft-Start Current ISS13,24 VSS13,24 = 2.0VDC -28- µA POWER GOOD VSEN1 Upper Threshold (VSEN1/DACOUT) VSEN1 Rising 108 - 110 % VSEN1 Under-Voltage (VSEN1/DACOUT) VSEN1 Rising 92 - 94 % VSEN1 Hysteresis (VSEN1/DACOUT) VSEN1 Falling - 2 - % PGOOD Voltage Low VPGOOD IPGOOD = -4mA - - 0.8 V VSEN2 Under-Voltage VSEN2 Rising - 1.00 - V VSEN2 Hysteresis VSEN2 Falling - 60 - mV VTTPG Voltage Low VVTTPG IVTTPG = -4mA - - 0.8 V NOTE: 2. Guaranteed by design Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Figures 1, 2 and 3 (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Typical Performance Curve FIGURE 4. BIAS SUPPLY CURRENT vs FREQUENCY 100 200 300 400 500 600 700 800 900 1000 SWITCHING FREQUENCY (kHz) 140 120 100 80 60 40 20 0 C = 660pF C = 1500pF C = 3600pF C = 4800pF CUGATE1 = CUGATE2 = CLGATE1 = C VIN = 5V VCC = 12V ISL6523A |
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