PDF ADP3208A Data sheet ( Hoja de datos )

Número de pieza	ADP3208A
Descripción	7-Bit Programmable Dual-Phase Mobile CPU Synchronous Buck Controller
Fabricantes	ON Semiconductor
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No Preview Available ! 7-Bit, Programmable, Dual-Phase, Mobile, CPU, Synchronous Buck Controller ADP3208A FEATURES General Description Single-chip solution Fully compatible with the Intel® IMVP-6+™ specifications The ADP3208 is a highly efficient, multiphase, synchronous buck switching regulator controller. With its integrated drivers, Integrated MOSFET drivers Selectable 1- or 2-phase operation with up to 1 MHz per phase switching frequency Guaranteed ±8 mV worst-case differentially sensed core voltage error over temperature Automatic power-saving mode maximizes efficiency with light load during deeper sleep operation the ADP3208 is optimized for converting the notebook battery voltage into the core supply voltage required by high performance Intel processors. An internal 7-bit DAC is used to read a VID code directly from the processor and to set the CPU core voltage to a value within the range of 0.3 V to 1.5 V. The phase relationship of the output signals ensures interleaved 2-phase operation. Soft transient control reduces inrush current and audio noise Active current balancing between output phases Independent current limit and load line setting inputs for additional design flexibility Built-in power good blanking supports voltage identification (VID) on-the-fly transients 7-bit, digitally programmable DAC with 0.3 V to 1.5 V output The ADP3208 uses a multimode architecture run at a program- mable switching frequency and optimized for efficiency depending on the output current requirement. The ADP3208 switches between single- and dual-phase operation to maximize efficiency with all load conditions. The chip includes a programmable load line slope function to adjust the output voltage as a Short-circuit protection with programmable latch-off delay Clock enable output delays the CPU clock until the core voltage is stable Output power or current monitor options 48-lead LFCSP ADP3208A version has 1.0V Boot voltage APPLICATIONS Notebook power supplies for next-generation Intel processors function of the load current so that the core voltage is always optimally positioned for a load transient. The ADP3208 also provides accurate and reliable short-circuit protection, adjustable current limiting, and a delayed power good output. The IC supports on-the-fly output voltage changes requested by the CPU. ADP3208 is specified over the extended commercial temperature range of 0°C to 100°C and is available in a 48-lead LFCSP FUNCTIONAL BLOCK DIAGRAM RAMP VRPM RPM RT SP PSI VID6, VID5, VID4, VID3, VID2, VID1, VID0 ST VARFREQ DPRSTP DPRSLP SS PWRGD PGDELAY CLKEN EN VCC GND RAMP GENER- ATOR OSCILLATOR PWM CMPS PWM LATCH PHASE CONTROL DRV2 IN OD2 VREF SWITCH AMPS VID DAC VDAC REFER- ENCE SELECT FBRTN CLREF PSI HOUSE- KEEPING CLTHSEL OVTH UVTH REFTH BIAS DRV1 IN OD1B OD1A + – – + ERR AMP ++–– CSAMP CLIM CMP – + – + SS +– +– UVLO REF BIAS ADP3208 VREF PMON PWM CSAVG – + PMON PMONFS VCC BST2 DRVH2 SW2 PVCC2 DRVL2 PGND2 BST1 DRVH1 SW1 PVCC1 DRVL1 PGND1 COMP FB LLINE CSCOMP CSSUM CSREF CLIM VRTT TTSNS FBRTN Figure 1. ©2008 SCILLC. All rights reserved. January 2008 – Rev. 2 Publication Order Number: ADP3208A/D http://www.Datasheet4U.com 1 page ADP3208A Parameter THERMAL THROTTLING/CROWBAR DISABLE CONTROL TTSNS Voltage Range2 TTSNS VRTT Threshold Voltage TTSNS VRTT Threshold Hysteresis TTSNS Crowbar Disable Threshold Voltage TTSNS Input Current VRTT Output Low Voltage VRTT Output High Voltage POWER GOOD CSREF Undervoltage Threshold CSREF Overvoltage Threshold CSREF Crowbar (Overvoltage Protection) Threshold CSREF Reverse Voltage Detection Threshold PWRGD Output Low Voltage PWRGD Output Leakage Current Power Good Delay Timer PGDELAY Voltage Detection Threshold PGDELAY Charge Current PGDELAY Discharge Resistance PWRGD Masking Time CLOCK ENABLE Output Low Voltage Output Leakage Current POWER MONITOR PMON Output Resistance PMON Leakage Current PMON Oscillator Frequency PMONFS Voltage Range2 PMONFS Output Current HIGH-SIDE MOSFET DRIVERS DRVH Output Resistance, Sourcing Current DRVH Output Resistance, Sinking Current Transition Times Propagation Delay Time BST Quiescent Current Symbol Conditions DPRSTP = high, PSI = high PSI = low VVRTT(TTSNS) Temperature sensing Crowbar disable threshold disable VCC = 5 V, TTSNS falling VCBDIS(TTSNS) VOL(VRTT) VOH(VRTT) TTSNS > 1.0 V, temperature sensing TTSNS = 0 V, disabling overvoltage protection ISINK(VRTT) = 400 μA ISOURCE(VRTT) = −400 μA VUV(CSREF) VOV(CSREF) VCB(CSREF) VRVP(CSREF) VOL(PWRGD) Relative to VVID = 0.5 V to 1.5 V Relative to VVID = 0.3125 V to 0.4875 V Relative to VVID = 0.5 V to 1.5 V Relative to FBRTN Relative to FBRTN CSREF falling CSREF rising ISINK(PWRGD) = 4 mA VPWRDG = 5 V VTH(PGDELAY) IPGDELAY RPGDELAY VPGDELAY = 2.0 V VPGDELAY = 0.2 V ISINK = 4 mA CLKEN = 5 V, VSS = GND ISINK = 2 mA PMON = 5 V PMONFS = 2 V PMONFS = 2.5 V BST − SW = 4.6 V BST − SW = 4.6 V trDRVH, tfDRVH tpdhDRVH BST − SW = 4.6 V, CL = 3 nF, see Figure 2 BST − SW = 4.6 V, CL = 3 nF, see Figure 2 BST − SW = 4.6 V, see Figure 2 EN = low, shutdown Rev. 2 \| Page 5 of 38 \| www.onsemi.com Min 0.4 0 2.45 50 −1 4 −160 150 1.65 −400 1.5 Typ 1 −100 2.5 95 −3 50 5 −300 200 1.7 −300 −60 70 0.03 2.9 −3 600 130 100 16 320 −10 1.9 1.5 10 8 16 5 Max 5 50 2.55 50 +1 100 250 1.75 −5 200 3 400 1 1 4 3.3 3 30 25 70 Unit μA nA V mV V mV mV μA μA mV V mV mV mV V mV mV mV μA V μA Ω μs mV μA Ω μA kHz V μA Ω Ω ns ns ns μA http://www.Datasheet4U.com 5 Page TEST CIRCUITS 7-BIT CODE 48 1.05V 1 PWRGD 1kΩ 10nF EN PGDELAY CLKEN FBRTN FB COMP SS ST VARFREQ VRTT TTSNS ADP3208 1μF BST1 SW1 PVCC1 DRVL1 PGND1 PGND2 DRVL2 PVCC2 SW2 DRVH2 BST2 5V 100nF 250kΩ 20kΩ 100nF Figure 4. Closed-Loop Output Voltage Accuracy ADP3208 VCC 5V 37 39kΩ 1kΩ 1V CSCOMP 17 100nF CSSUM 19 CSREF 18 GND 24 VOS = CSCOMP – 1V 40 Figure 5. Current Sense Amplifier, VOS ADP3208A 5V 10kΩ ΔV 1V ADP3208 VCC 37 COMP 7 FB 6 LLINE 16 – CSREF 18 + GND 24 VID DAC ΔVFB = FBΔV = 80mV – FBΔV = 0mV Figure 6. Positioning Accuracy Rev. 2 \| Page 11 of 38 \| www.onsemi.com http://www.Datasheet4U.com 11 Page

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