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ISL6377 Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL6377 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 36 page ISL6377 7 FN8336.0 August 6, 2012 15 ISEN1 Individual current sensing for Channel 1 of the Core VR. If ISEN2 is tied to +5V, this pin cannot be left open and must be tied to GND with a 10kΩ resistor. If ISEN1 is tied to +5V, the Core portion of the IC is shut down. 16 ISUMP Non-inverting input of the transconductance amplifier for current monitor and load line of Core output. 17 ISUMN Inverting input of the transconductance amplifier for current monitor and load line of Core output. 18 VSEN Output voltage sense pin for the Core controller. Connect to the +sense pin of the microprocessor die. 19 RTN Output voltage sense return pin for both Core VR and Northbridge VR. Connect to the -sense pin of the microprocessor die. 20 IMON Core output current monitor. A current proportional to the Core VR output current is sourced from this pin. 21 FB Output voltage feedback to the inverting input of the Core controller error amplifier. 22 COMP Core controller error amplifier output. A resistor from COMP to GND sets the Core VR offset voltage. 23 PGOOD Open-drain output to indicate the Core portion of the IC is ready to supply regulated voltage. Pull up externally to VDD or 3.3V through a resistor. 24 BOOT1 Connect an MLCC capacitor across the BOOT1 and the PHASE1 pins. The boot capacitor is charged, through an internal boot diode connected from the VDDP pin to the BOOT1 pin, each time the PHASE1 pin drops below VDDP minus the voltage dropped across the internal boot diode. 25 UGATE1 Output of the Phase 1 high-side MOSFET gate driver of the Core VR. Connect the UGATE1 pin to the gate of the Phase 1 high-side MOSFET(s). 26 PHASE1 Current return path for the Phase 1 high-side MOSFET gate driver of VR1. Connect the PHASE1 pin to the node consisting of the high-side MOSFET source, the low-side MOSFET drain, and the output inductor of Phase 1. 27 LGATE1 Output of the Phase 1 low-side MOSFET gate driver of the Core VR. Connect the LGATE1 pin to the gate of the Phase 1 low-side MOSFET(s). 28 PWM_Y Floating PWM output used for either Channel 3 of the Core VR or Channel 1 of the Northbridge VR depending on the FCCM_NB resistor connected between FCCM_NB and GND. 29 VDD 5V bias power. A resistor [2Ω] and a decoupling capacitor should be used from the +5V supply. A high quality, X7R dielectric MLCC capacitor is recommended. 30 VDDP Input voltage bias for the internal gate drivers. Connect +5V to the VDDP pin. Decouple with at least 1µF of capacitance to GND. A high quality, X7R dielectric MLCC capacitor is recommended. 31 LGATE2 Output of the Phase 2 low-side MOSFET gate driver of the Core VR. Connect the LGATE2 pin to the gate of the Phase 2 low-side MOSFET(s). 32 PHASE2 Current return path for the Phase 2 high-side MOSFET gate driver of the Core VR. Connect the PHASE2 pin to the node consisting of the high-side MOSFET source, the low-side MOSFET drain, and the output inductor of Phase 2. 33 UGATE2 Output of the Phase 2 high-side MOSFET gate driver of the Core VR. Connect the UGATE2 pin to the gate of the Phase 2 high-side MOSFET(s). 34 BOOT2 Connect an MLCC capacitor across the BOOT2 and PHASE2 pins. The boot capacitor is charged, through an internal boot diode connected from the VDDP pin to the BOOT2 pin, each time the PHASE2 pin drops below VDDP minus the voltage dropped across the internal boot diode. 35 PWM4 PWM output of Channel 4 of the Core VR. Disabled if ISEN4 is tied to +5V. 36 BOOTX Boot connection of the programmable internal driver used for either Channel 3 of the Core VR or Channel 1 of the Northbridge VR based on the configuration state selected by the FCCM_NB resistor. Connect an MLCC capacitor across the BOOT1X and the PHASEX pins. The boot capacitor is charged, through an internal boot diode connected from the VDDP pin to the BOOTX pin, each time the PHASEX pin drops below VDDP minus the voltage dropped across the internal boot diode. 37 UGATEX High-side MOSFET gate driver portion of the programmable internal driver used for either Channel 3 of the Core VR or Channel 1 of the Northbridge VR based on the configuration state selected by the FCCM_NB resistor. Connect the UGATEX pin to the gate of the high-side MOSFET(s) for either Phase 3 of the Core VR or Phase 1 of the Northbridge VR based on the configuration state selected. Pin Descriptions (Continued) PIN NUMBER SYMBOL DESCRIPTION |
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