Details, datasheet, quote on part number: ADP3207XCPZ
PartADP3207XCPZ
CategoryPower Management
Description7-Bit Programmable Multiphase Mobile CPU Synchronous Buck Controller
The ADP3207 is a high efficiency, multiphase, synchronous, buck-switching regulator controller optimized for converting notebook battery voltage into the core supply voltage required by high performance Intel processors. The part uses an internal 7-bit DAC to read voltage identification (VID) code directly from the processor that sets the output voltage. The phase relationship of the output signals can be programmed to provide 1-, 2-, or 3-phase operation, allowing for the construction of up to three interleaved buck-switching stages.

The ADP3207 uses a multimode architecture to drive the logic-level PWM outputs at a programmable switching frequency that can be optimized depending on the output current requirement. The part switches between multiphase and single-phase operation to maximize its effectiveness under all load conditions. In addition, the ADP3207 includes a programmable slope function to adjust the output voltage as a function of the load current. As a result, it is always best positioned for a system transient.

The chip also provides accurate and reliable short-circuit protection, adjustable current limiting, and a delayed power-good output that accommodates on-the-fly output voltage changes requested by the CPU.

The ADP3207 is specified over the extended commercial temperature range of 0°C to 100°C and is available in a 40-lead LFCSP package.


Applications
Notebook Power Supplies for Next Generation Intel® Processors
CompanyAnalog Devices
DatasheetDownload ADP3207XCPZ datasheet
Packages40 ld LFCSP (6x6mm)
  

 

Features, Applications
7-Bit Programmable Multiphase Mobile CPU Synchronous Buck Controller ADP3207
FEATURES

or 3-phase operation to 750 kHz per phase ±8 mV worst-case differential sensing error over temperature Interleaved PWM outputs for driving external high power MOSFET drivers Automatic power-saving modes maximize efficiency during light load and deeper sleep 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 masking supports VID on-the-fly 7-bit digitally programmable 1.5 V output Overload and short-circuit protection with programmable latch-off delay Built-in clock enable output delays CPU clock until CPU supply voltage stabilizes

Notebook power supplies for next generation Intel® processors

The is a high efficiency, multiphase, synchronous, buck-switching regulator controller optimized for converting notebook battery voltage into the core supply voltage required by high performance Intel processors. The part uses an internal 7-bit DAC to read voltage identification (VID) code directly from the processor that sets the output voltage. The phase relationship of the output signals can be programmed to provide or 3-phase operation, allowing for the construction up to three interleaved buck-switching stages. The ADP3207 uses a multimode architecture to drive the logiclevel PWM outputs at a programmable switching frequency that can be optimized depending on the output current requirement. The part switches between multiphase and single-phase operation to maximize its effectiveness under all load conditions. In addition, the ADP3207 includes a programmable slope function to adjust the output voltage as a function of the load current. As a result, it is always best positioned for a system transient.

The chip also provides accurate and reliable short-circuit protection, adjustable current limiting, and a delayed powergood output that accommodates on-the-fly output voltage changes requested by the CPU. The ADP3207 is specified over the extended commercial temperature range to 100°C and is available a 40-lead LFCSP package.

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.

APPLICATIONS
SOFT START/ 32 PSI BOOT/ 10 DPRSLP DEEPER SLEEP 9 STSET CONTROL

Features.............................................................................................. 1 Applications....................................................................................... 1 General Description......................................................................... 1 Functional Block Diagram.............................................................. 1 Revision History............................................................................... 2 Specifications..................................................................................... 3 Test Circuits....................................................................................... 6 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics........................................... 10 Theory of Operation...................................................................... 11 Number of Phases....................................................................... 11 Operation Modes........................................................................ 11 Switch Frequency Setting.......................................................... 12 Output Voltage Differential Sensing........................................ 12 Output Current Sensing............................................................ 12 Active Impedance Control Mode............................................. 13 Current Control Mode and Thermal Balance........................ 13 Voltage Control Mode................................................................ 13 Power-Good Monitoring........................................................... 13 Power-Up Sequence and Soft Start.......................................... 14 Soft Transient.............................................................................. 14 Current-Limit, Short-Circuit, and Latch-Off Protection...... 15 Changing VID on-the-Fly......................................................... 15 Output Crowbar......................................................................... 16 Reverse Voltage Protection....................................................... 16 Output Enable and UVLO........................................................ 16 Thermal Throttling Control..................................................... 16 Application Information................................................................ 20 Setting the Clock Frequency for PWM Mode........................ 20 Soft-Start and Current-Limit Latch-Off Delay Times........... 20 PWRGD Delay Timer................................................................ 20 Inductor Selection...................................................................... 20 COUT Selection............................................................................. 22 Power MOSFETs......................................................................... 23 Ramp Resistor Selection............................................................ 24 Setting the Switching Frequency for RPM Mode Operation of Phase 1......................................................................................... 25 Current-Limit Setpoint.............................................................. 25 Feedback Loop Compensation Design.................................... 25 CIN Selection and Input Current DI/DT Reduction................ 26 Soft Transient Setting................................................................. 26 Selecting Thermal Monitor Components............................... 26 Tuning Procedure for ADP3207............................................... 27 Layout and Component Placement......................................... 28 Outline Dimensions....................................................................... 30 Ordering Guide.......................................................................... 30

VCC 5 V, FBRTN = GND, EN = VCC, VVID 1.5000 V, PSI 1.05 V, DPRSLP = GND, DPRSTP 1.05 V, LLSET = CSREF, to 100°C, unless otherwise noted.1 Table 1.

Parameter VOLTAGE ERROR AMPLIFIER Output Voltage Range2 VID DAC DC Accuracy Load Line Positioning DC Accuracy Differential Nonlinearity2 Line Regulation Input Bias Current Output Current Gain Bandwidth Product Slew Rate LLSET Input Voltage Range2 LLSET Input Bias Current FBRTN Current VID DAC INPUTS Input Low Voltage Input High Voltage Input Current VID Transition Delay Time2 OSCILLATOR Frequency Range2 Frequency Setting Symbol VCOMP VFB - VVID VFB(BOOT) VFB - VVID VFB IFB ICOMP GBW(ERR) VLLSET ILLSET IFBRTN VIL VIH IIN(VID) Conditions Min FB forced to VOUT ­ 3% COMP = FB CCOMP 10 pF Relative to CSREF VIDX VID change to FB change Typ Max Units V mV LSB µA mA MHz V/µs µA ns

Measured at FB, relative to VVID, see Figure 2 Measured at end of start-up Measured at FB, relative to VVID, LLSET ­ CSREF -80 mV VCC 5.25 V

PSI = DPRSTP 1.05 V, DPRSLP = GND = +25°C, VVID PWM3 = VCC, VVID PWM2 = VCC, VVID 215 k IRAMPADJ µA In normal mode In shutdown, or in UVLO, RAMPADJ k to GND, VVID 1.4000 V IVRPM = 0 IVRPM 120 µA VVID 215 k VOS(RPM) = VCOMP - VRRPM, PSI = GND CSSUM ­ CSREF

RAMPADJ Voltage RAMPADJ Input Current Range2 RPM RT Voltage VRPM Reference Voltage RRPM Output Current RPM Comparator Offset CURRENT-SENSE AMPLIFIER Offset Voltage Input Bias Current Gain Bandwidth Product Slew Rate Input Common-Mode Range2 Output Voltage Range2 Output Current

VRT VVRPM IRRPM VOS(RPM) VOS(CSA) IBIAS(CSSUM) GBW(CSA)
CCSCOMP 10 pF CSSUM and CSREF ICSCOMP Sinking Current

 

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