PDF ADP3209 Data sheet ( Hoja de datos )

Número de pieza	ADP3209
Descripción	Synchronous Buck Controller
Fabricantes	ON Semiconductor
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No Preview Available ! 5-Bit, Programmable, Single-Phase, Synchronous Buck Controller ADP3209 FEATURES GENERAL DESCRIPTION Single-chip solution Fully compatible with the Intel® GMCH chipset voltage regulator specifications Integrated MOSFET drivers ±8 mV worst-case differentially sensed core voltage error over temperature Automatic power-saving modes maximize efficiency during light load operation Soft transient control reduces inrush current and audio noise Independent current limit and load line setting inputs for additional design flexibility Built-in power-good masking supports voltage identification (VID) on-the-fly transients 5-bit, digitally programmable DAC with 0.4 V to 1.25 V output Short-circuit protection with programmable latch-off delay Output power or current monitor options 32-lead LFCSP APPLICATIONS Notebook power supplies for next-generation Intel chipsets The ADP3209 is a highly efficient, single-phase, synchronous buck switching regulator controller. With its integrated drivers, the ADP3209 is optimized for converting the notebook battery voltage to render the supply voltage required by high performance Intel chipsets. An internal 5-bit DAC is used to read a VID code directly from the chipset and to set the GMCH core voltage to a value within the range of 0.4 V to 1.25 V. The ADP3209 uses a multimode architecture. It provides program- mable switching frequency that can be optimized for efficiency depending on the output current requirement. In addition, the ADP3209 includes a programmable load line slope function to adjust the output voltage as a function of the load current so that the core voltage is always optimally positioned for a load transient. The ADP3209 also provides accurate and reliable current overload protection and a delayed power-good output. The IC supports on-the-fly output voltage changes requested by the chipset. The ADP3209 is specified over the extended commercial tempera- ture range of 0°C to 100°C and is available in a 32-lead LFCSP. FUNCTIONAL BLOCK DIAGRAM RAMP VRPM RPM RT VID4 VID3 VID2 VID1 VID0 ST VARFREQ SS PWRGD EN VCC GND RAMP GENER- ATOR OSCILLATOR PWM CMPS PWM LATCH PHASE CONTROL VREF SWITCH AMPS VID VDAC REFERENCE DAC SELECT DRV IN ODB ODA + – –+ ERR AMP ++–– SS FBRTN CSAMP – + CLREF HOUSE- KEEPING CLTHSEL CLIM CMP – + +– +– REFTH BIAS UVLO REF BIAS VREF ADP3209 PMON PWM CSAVG – + BST DRVH SW PVCC DRVL PGND COMP FB LLINE CSFB CSREF CSCOMP CLIM FBRTN PMON PMONFS Figure 1. ©2008 SCILLC. All rights reserved. January 2008 – Rev. 2 Publication Order Number: ADP3209/D 1 page ADP3209 Parameter HIGH-SIDE MOSFET DRIVER Output Resistance, Sourcing Current Output Resistance, Sinking Current Transition Times Dead Delay Times BST Quiescent Current Symbol trDRVH, tfDRVH tpdhDRVH LOW-SIDE MOSFET DRIVER Output Resistance, Sourcing Current Output Resistance, Sinking Current Transition Times Propagation Delay Times SW Transition Timeout Zero-Crossing Threshold PVCC Quiescent Current trDRVL, tfDRVL tpdhDRVL tTO(SW) VZC SOFT STOP CSREF Resistance to GND SUPPLY Supply Voltage Range2 Supply Current VCC VCC OK Threshold Voltage VCC UVLO Threshold Voltage UVLO Hysteresis2 VCCOK VCCUVLO Conditions BST − SW = 4.6 V BST − SW = 4.6 V BST − SW = 4.6 V, CL = 3 nF, Figure 2 BST − SW = 4.6 V, CL = 3 nF, Figure 2 BST − SW = 4.6 V, Figure 2 EN = low, shutdown EN = high, no switching CL = 3 nF, Figure 2 CL = 3 nF, Figure 2 CL = 3 nF, Figure 2 BST − SW = 4.6 V EN = low, shutdown EN = high, no switching EN = low or latch off Normal mode EN = 0 V VCC rising VCC falling Min Typ 1.6 1.3 15 13 10 5 200 1.4 1 15 14 10 85 130 2.2 14 170 70 4.5 5 6 4.4 4.0 4.2 150 Max Unit 3.3 Ω 2.8 Ω 35 ns 31 ns 30 ns 15 µA µA 3.0 Ω 2.7 Ω 35 ns 35 ns 30 ns 200 ns V 50 µA µA Ω 5.5 V 9 mA 40 µA 4.5 V V mV 1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). 2 Guaranteed by design or bench characterization, not production tested. Rev. 2 \| Page 5 of 32 \| www.onsemi.com 5 Page 1.35 MEASURED LOAD LINE 1.30 1.25 SPECIFIED LOAD LINE 1.20 +2% –2% 1.15 0 5 10 LOAD CURRENT (A) Figure 10. Load Line Accuracy 15 35 30 25 20 15 10 5 VIN = 12V 0 0246 VCC VOLTAGE (V) Figure 11. VCC Current vs. VCC Voltage with Enable Low ADP3209 4 OUTPUT VOLTAGE SWITCH NODE 2 3 LOW-SIDE GATE DRIVE 1 INDUCTOR CURRENT CH1 5.00V CH2 5.00V M400ns CH3 5.00A CH4 20.0mV~ T 10.00% A CH3 4.00A Figure 13. DCM Waveforms, 3 A Load Current 4 OUTPUT VOLTAGE SWITCH NODE 2 INDUCTOR CURRENT 3 LOW-SIDE GATE DRIVE 1 CH1 5.00V CH2 5.00V M400ns CH3 5.00A CH4 20.0mV~ T 10.00% A CH3 4.60A Figure 14. CCM Waveforms, 6 A Load Current PWRGD 3 SS OUTPUT VOLTAGE 4 EN 1 CH1 2.00V CH2 1.00V CH3 2.00V CH4 1.00V M400s T 13.20% A CH1 Figure 12. Start-Up Waveforms 800mV 4 OUTPUT VOLTAGE SWITCH NODE 2 LOAD CURRENT 1 CH1 100mV CH2 10.0V~ CH4 20.0mV M40.0s A CH1 120mV T 25.00% Figure 15. Load Transient, 2 A to 10 A, VIN = 19 V Rev. 2 \| Page 11 of 32 \| www.onsemi.com 11 Page

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