ncp5389 ON Semiconductor, ncp5389 Datasheet
ncp5389
Available stocks
Related parts for ncp5389
ncp5389 Summary of contents
Page 1
... NCP5389 2/3 Phase Buck Controller for VR11 Pentium IV Processor Applications The NCP5389 is a two- or three-phase buck controller which combines differential voltage and current sensing, and adaptive voltage positioning to power Intel's most demanding Pentium Processors and low voltage, high current power supplies. Dual-edge ...
Page 2
... NCP5389 PIN CONNECTIONS 1 VID0 2 VID1 3 VID2 4 NCP5389 VID3 2/3-Phase Buck Controller 5 (32-Pin QFN) VID4 6 VID5 AGND Down-Bonded to 7 Exposed Flag VID6 8 VID7 http://onsemi.com DRVON 22 CS3 21 CS3N 20 CS2 19 CS2N 18 CS1 17 CS1N ...
Page 3
... Amplifier VDRP + - 1.3 V CS1 + - CS1N Gain = 6 CS2 + CS2N - Gain = 6 CS3 + CS3N - Gain = 6 ROSC2 Oscillator ROSC ILIM EN VCC AGND 9.0 V Figure 1. Simplified Block Diagram NCP5389 NCP5389 Fault + - + - + - 3OFF OVER DIFFOUT 1.3 V Fault Logic + 3 Phase Detect - and Current Limit Monitor Circuits + - UVLO http://onsemi.com 3 DGND ENB G1 ...
Page 4
... VS- VS+ RISO1 RISO2 RT2 NCP5389 CFB1 RFB1 DIFFOUT RFB VFB RDRP VDRP RD1 CD1 COMP RF ILIM CF CH RLIM1 RLIM2 VCCP VSSP NCP5389 12 V_FILTER CVCC1 NCP3418B VCC OD VCC DGND AGND IN G1 CS1 CS1N 12 V_FILTER G2 CS2 CS2N VCC G3 OD CS3 CS3N IN 12 V_FILTER ...
Page 5
... VS- VS+ RISO1 RISO2 RT2 NCP5389 CFB1 RFB1 DIFFOUT RFB VFB RDRP VDRP RD1 CD1 COMP RF ILIM CF CH RLIM1 RLIM2 VCCP VSSP NCP5389 12 V_FILTER CVCC1 VCC OD VCC DGND AGND IN G1 CS1 CS1N G2 CS2 CS2N G3 CS3 CS3N 12 V_FILTER DRVON ROSC2 ROSC SS 4 ROSC2 ...
Page 6
... THPAD/ Copper pad on the bottom of the IC for heatsinking. This pin should be connected to the ground plane under AGND the IC. Power supply return for the analog circuits that control output voltage. NCP5389 Description CORE sense amplifier. CORE ) will set the amount of output voltage droop (AVP) during DRP ) to produce an output voltage droop ...
Page 7
... Open Loop Phase Margin (Note 1) Slew Rate (Note 1) Maximum Output Voltage Minimum Output Voltage Output Source Current (Note 1) Output Sink Current (Note 1) 1. Guaranteed by design. Not tested in production. NCP5389 Rating ) on a thermally conductive PCB in free air qJA = 0.1 mF, F < 13.2 V; All DAC Codes ...
Page 8
... Current Summing Amp Output Offset Voltage Maximum V Output Voltage DRP Minimum V Output Voltage DRP Output Source Current (Note 2) Output Sink Current (Note 2) 2. Guaranteed by design. Not tested in production. NCP5389 = 0.1 mF, F < 13.2 V; All DAC Codes VCC Test Conditions Min DRVON = High - DRVON = Low - ...
Page 9
... Duty Cycle Minimum PWM Linear Duty Cycle (Note 3) PWM Comparator Offset Mismatch (Note 3) Phase Angle Error Propagation Delay (Note 3) Propagation Delay (Note 3) 3. Guaranteed by design. Not tested in production. NCP5389 = 0.1 mF, F < 13.2 V; All DAC Codes VCC Test Conditions Min CSx = CSxN = 1.4 V -200 -0 ...
Page 10
... VR_RDY (POWER GOOD) OUTPUT Saturation Voltage Rise Time Output Voltage at Power-up (Note 4) High – Output Leakage Current Upper Threshold Voltage Rising Delay Falling Delay 4. Guaranteed by design. Not tested in production. NCP5389 = 0.1 mF, F < 13.2 V; All DAC Codes VCC Test Conditions Min Sourcing 500 mA 3.3 ...
Page 11
... UVLO Start Threshold UVLO Stop Threshold UVLO Hysteresis VID INPUTS Upper Threshold Lower Threshold Input Bias Current Delay before Latching VID Change (VID De-Skewing) 5. Guaranteed by design. Not tested in production. NCP5389 = 0.1 mF, F < 13.2 V; All DAC Codes VCC Test Conditions Min ENABLE = HI, V < 1 ...
Page 12
... Operating Current DAC System Voltage Accuracy 1.0 V < DAC < 1.6 V 0.8 V < DAC < 1.0 V 0.5 V < DAC < 0.8 V With CS Input DVin = 0 V No-Load Offset Voltage from Nominal DAC Specification NCP5389 = 0.1 mF, F < 13.2 V; All DAC Codes VCC Test Conditions Min - - = 400 kHz - ...
Page 13
... NCP5389 VID4 VID3 VID2 VID1 12 ...
Page 14
... NCP5389 VID4 VID3 VID2 VID1 12 ...
Page 15
... NCP5389 VID4 VID3 VID2 VID1 12 ...
Page 16
... NCP5389 VID4 VID3 VID2 VID1 12 ...
Page 17
... T , AMBIENT TEMPERATURE (°C) A Figure 4. IC Quiescent Current vs. Ambient Temperature 0.0198 0.0196 0.0194 0.0192 0.0190 0.0188 0.0186 0.0184 0.0182 0.0180 0.5 NCP5389 VID4 VID3 VID2 VID1 12 TYPICAL CHARACTERISTICS 10 9 ...
Page 18
... Lockout, Soft-Start, Overcurrent Protection, Overvoltage Protection, and Power Good Monitor. Remote Output Sensing Amplifier (RSA) A true differential amplifier allows the NCP5389 to measure Vcore voltage feedback with respect to the Vcore ground reference point by connecting the Vcore reference point to VS+, and the Vcore ground reference point to VS-. ...
Page 19
... UVLO threshold overvoltage CC condition exists. The NCP5389 ramps Vcore to 1 the SS capacitor charge rate, pauses at 1.1 V for 170 ms, reads the VID pins to determine the DAC setting, then ramps Vcore to the final DAC setting at the Dynamic VID slew rate of 7.3 mV/ms ...
Page 20
... The NCP5389 is a high performance multiphase controller optimized to meet the Intel VR11 Specifications. The demo board for the NCP5389 is available by request configured as a three phase solution with decoupling designed to provide a 1.0 mW load line under step load. A schematic is available upon request from ON Semiconductor ...
Page 21
... VID selection, then enable the test. See Figures 10 through 12. Figure 10. 1.6 to 0.5 Dynamic VID Response Figure 11. Dynamic VID Settling Time Rising Figure 12. Dynamic VID Settling Time Falling NCP5389 Design Methodology Decoupling the V Pin on the input filter is required as shown in the V minimize supply noise on the IC ...
Page 22
... A at 100°C. The total sensed current can be observed as a scaled voltage at the VDRP pin added to a positive, no-load offset of approximately 1.3 V. NCP5389 This equation is valid for the individual phase frequency in both three and four phase mode. 32. 10.14 ROSC + 10 ...
Page 23
... Inductor Current Sense Compensation The NCP5389 uses the inductor current sensing method. This method uses an RC filter to cancel out the inductance of the inductor and recover the voltage that is the result of Rsense(T) + Figure 16. The demoboard inductor measured 350 nH and 0. room temp. The actual value used for Rsense was 953 W which matches the equation for Rsense at approximately 50C ...
Page 24
... DC-DC converter must have sufficiently high gain to control the output impedance completely. Standard Type-3 compensation works well with the NCP5389. RFB1 should be kept above 50 W for amplifier stability reasons. The goal is to compensate the system such that the resulting gain generates constant output impedance from the frequency where the ceramic takes over holding the impedance below 1 ...
Page 25
... NTC will be effected by the location of the output inductor with respect to the NTC and airflow, and should be verified with an actual system thermal solution. NCP5389 RRDP determines the target output impedance by the basic equation: The value of the inductor's DCR varies with temperature ...
Page 26
... Allegro Free Physical Viewer 15.x from the Cadence website http://www.cadence.com/. NCP5389 Figure 20. Close attention should be paid to the routing of the sense traces and control lines that propagate away from the controller IC ...
Page 27
... REF b 0.180 0.250 0.300 D 5.00 BSC D2 2.950 3.100 3.250 E 5.00 BSC E2 2.950 3.100 3.250 e 0.500 BSC K 0.200 --- --- L 0.300 0.400 0.500 SOLDERING FOOTPRINT* 5.30 3.20 3. 0.50 PITCH ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your loca Sales Representative NCP5389/D ...