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ISL62881 Datasheet(PDF) 2 Page - Intersil Corporation |
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ISL62881 Datasheet(HTML) 2 Page - Intersil Corporation |
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2 / 35 page  2 FN6924.0 October 26, 2009 Pin Function Description GND (Bottom Pad) Signal common of the IC. Unless otherwise stated, signals are referenced to the GND pin. CLK_EN# Open drain output to enable system PLL clock; goes active 13 switching cycles after Vcore is within 10% of Vboot. PGOOD Power-Good open-drain output indicating when the regulator is able to supply regulated voltage. Pull-up externally with a 680Ω resistor to VCCP or 1.9kΩ to 3.3V. RBIAS A resistor to GND sets internal current reference. A 147kΩ resistor sets the controller for CPU core application and a 47kΩ resistor sets the controller for GPU core application. VR_TT# Thermal overload output indicator. NTC Thermistor input to VR_TT# circuit. VW A resistor from this pin to COMP programs the switching frequency (8kΩ gives approximately 300kHz). COMP This pin is the output of the error amplifier. Also, a resistor across this pin and GND adjusts the overcurrent threshold. FB This pin is the inverting input of the error amplifier. VSEN Remote core voltage sense input. Connect to microprocessor die. RTN Remote voltage sensing return. Connect to ground at microprocessor die. ISUM- and ISUM+ Droop current sense input. VDD 5V bias power. VIN Battery supply voltage, used for feed-forward. IMON An analog output. IMON outputs a current proportional to the regulator output current. BOOT Connect an MLCC capacitor across the BOOT and the PHASE pins. The boot capacitor is charged through an internal boot diode connected from the VCCP pin to the BOOT pin, each time the PHASE pin drops below VCCP Pin Configurations ISL62881 (28 LD TQFN) TOP VIEW ISL62881B (32 LD TQFN) TOP VIEW 1 28 2 3 4 5 6 7 21 20 19 18 17 16 15 27 26 25 24 23 22 8 9 10 11 12 13 14 GND PAD (BOTTOM) VID0 VCCP LGATE PHASE UGATE COMP FB VW PGOOD RBIAS CLK_EN# VSSP VSEN VID1 1 32 2 3 4 5 6 7 24 23 22 21 20 19 18 31 30 29 28 27 26 910 11 12 13 14 15 GND PAD (BOTTOM) VID0 VCCP LGATEa PHASE GND VW NTC RBIAS VR_TT# VSSP VID1 8 COMP FB PGOOD 16 17 UGATE LGATEb 25 ISL62881, ISL62881B |
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