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General Description

The MAX8760 is a dual-phase, Quick-PWM™, step-

down controller for 6-bit VID AMD Mobile Turion™ 64

CPU core supplies. Dual-phase operation reduces input

ripple current requirements and output voltage ripple

while easing component selection and layout difficulties.

The quick-PWM control scheme provides instantaneous

response to fast-load current steps. The MAX8760

includes active voltage positioning with adjustable gain

and offset, reducing power dissipation and bulk output

capacitance requirements.

The MAX8760 is intended for two different notebook CPU

core applications: stepping down the battery directly or

stepping down the 5V system supply to create the core

voltage. The single-stage conversion method allows this

device to directly step down high-voltage batteries for the

highest possible efficiency. Alternatively, two-stage con-

version (stepping down the 5V system supply instead of

the battery) at a higher switching frequency provides the

minimum possible physical size.

The MAX8760 complies with AMD’s desktop and mobile

CPU specifications. The switching regulator features soft-

start and power-up sequencing, and soft-shutdown. The

MAX8760 also features independent four-level logic inputs

for setting the suspend voltage (S0, S1).

The MAX8760 includes output undervoltage protection,

thermal protection, and voltage regulator power-OK

(VROK) output. When any of these protection features

detect a fault, the controller shuts down.

The MAX8760 is available in a low-profile, 40-pin 6mm x

6mm thin QFN package. For other CPU platforms, refer to

the pin-to-pin compatible MAX1544, MAX1519/MAX1545,

and MAX1532/MAX1546/MAX1547 data sheets.

Applications

6-Bit VID AMD Mobile Turion 64 CPU

Multiphase CPU Core Supply

Voltage-Positioned Step-Down Converters

Servers/Desktop Computers

Features

♦ Dual-Phase, Quick-PWM Controller

♦ ±0.75% V

OUT

Accuracy Over Line, Load, and

Temperature (1.3V)

♦ Active Voltage Positioning with Adjustable Gain

and Offset

♦ 6-Bit On-Board DAC: 0.375V to 1.55V Output

Adjust Range

♦ Selectable 100kHz/200kHz/300kHz/550kHz

Switching Frequency

♦ 4V to 28V Battery Input Voltage Range

♦ Adjustable Slew-Rate Control

♦ Drives Large Synchronous Rectifier MOSFETs

♦ Undervoltage and Thermal-Fault Protection

♦ Power Sequencing and Timing

♦ Selectable Suspend Voltage

♦ Soft-Start and Soft-Shutdown

♦ Selectable Single- or Dual-Phase Pulse Skipping

OAIN+

OAIN-

GNDS

CCV

GND

CCI

DHS

LXS

BSTS

CMP

CMN

CSN

12345678910

30 29 28 27 26 25 24

23 22 21

CSP

DLS

PGND

OFS

REF

ILIM

SUS

TON

TIME

DLM

DHM

LXM

BSTM

VROK

THIN QFN

MAX8760

TOP VIEW

V+

SKIP

SHDN

Pin Configuration

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX8760ETL

-40°C to +100°C

40 Thin QFN 6mm x 6mm

MAX8760ETL+

-40°C to +100°C

40 Thin QFN 6mm x 6mm

MAX8760

Dual-Phase, Quick-PWM Controller for AMD

Mobile Turion 64 CPU Core Power Supplies

________________________________________________________________ Maxim Integrated Products 1

19-3721; Rev 0; 5/05

For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

Turion is a trademark of AMD.

+Denotes lead-free package.

Summary of content (39 pages)

PAGE 1
9-3721; Rev 0; 5/05 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies ♦ ±0.75% VOUT Accuracy Over Line, Load, and Temperature (1.3V) ♦ Active Voltage Positioning with Adjustable Gain and Offset ♦ 6-Bit On-Board DAC: 0.375V to 1.
PAGE 2
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +30V VCC to GND ..............................................................-0.3V to +6V VDD to PGND............................................................-0.3V to +6V SKIP, SUS, D0–D5 to GND.......................................-0.3V to +6V ILIM, FB, OFS, CCV, CCI, REF, OAIN+, OAIN- to GND................
PAGE 3
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.
PAGE 4
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.
PAGE 5
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.
PAGE 6
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.
PAGE 7
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D5 = GND, TA = -40°C to +100°C, unless otherwise specified.) (Note 5) PARAMETER SYMBOL CONDITIONS Quiescent Supply Current (VCC) ICC Quiescent Supply Current (VDD) MIN MAX UNITS Measured at VCC, FB forced above the regulation point, OAIN- = FB, VOAIN+ = 1.3V 3.
PAGE 8
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS = SUS = GNDS = D0–D5 = GND, TA = -40°C to +100°C, unless otherwise specified.) (Note 5) PARAMETER DL_ Gate-Driver On-Resistance SYMBOL RON(DL) CONDITIONS MIN High state (pullup) MAX 4.
PAGE 9
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies 1.24 80 VIN = 20V 70 1.22 VIN = 7V 60 10 50 20 30 0.88 0.01 1 100 10 0 10 20 40 30 LOAD CURRENT (A) EFFICIENCY vs. LOAD CURRENT (VOUT = 1.00V) OUTPUT VOLTAGE vs. LOAD CURRENT (VOUT = 0.80V) EFFICIENCY vs. LOAD CURRENT (VOUT = 0.80V) VIN = 7V 0.82 OUTPUT VOLTAGE (V) 70 VIN = 12V 100 0.80 0.78 VIN = 20V SKIP = REF SKIP = GND 0.
PAGE 10
Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 12V, VCC = VDD = 5V, SHDN = SKIP = VCC, D0–D5 set for 1.5V (SUS = GND), S0 and S1 set for 1V (SUS = VCC), OFS = GND, TA = +25°C, unless otherwise specified.) CURRENT-BALANCE OFFSET VOLTAGE DISTRIBUTION REFERENCE VOLTAGE DISTRIBUTION 40 0 -50 30 20 UNDEFINED REGION -150 0 0.5 1.0 1.5 1.995 2.005 2.
PAGE 11
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies SOFT-START POWER-UP SEQUENCE 3.3V 0 SOFT-SHUTDOWN WAVEFORMS MAX8760 toc18 MAX8760 toc17 MAX8760 toc19 3.3V A 3.3V A 0 A 1.46V B 0 1.46V B 0 C 0 0 D 0 B E 0 10A D 10A C 0 D 200µs/div 2ms/div A. SHDN, 5V/div B. VROK, 5V/div C. 1.5V OUTPUT, 1V/div C 200µs/div A. SHDN, 5V/div B. 1.5V OUTPUT, 500mV/div C. IL1, 10A/div D. IL2, 10A/div RLOAD = 75mΩ D. IL1, 10A/div E. IL2, 10A/div RLOAD = 75mΩ A.
PAGE 12
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 12V, VCC = VDD = 5V, SHDN = SKIP = VCC, D0–D5 set for 1.5V (SUS = GND), S0 and S1 set for 1V (SUS = VCC), OFS = GND, TA = +25°C, unless otherwise specified.) SUSPEND TRANSITION (DUAL-PHASE PWM OPERATION) SUSPEND TRANSITION (SINGLE-PHASE SKIP OPERATION) MAX8760 toc22 3.3V 0 MAX8760 toc23 A 1.5V 3.3V 0 A 1.5V B 1.0V B 1.0V 10A 2.
PAGE 13
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies 100mV DAC CODE TRANSITION 400mV DAC CODE TRANSITION MAX8760 toc26 MAX8760 toc27 3.3V A 0 1.5V 3.3V A 0 1.5V B 1.4V 5A C 5A D 20µs/div A. D1, 5V/div B. VOUT = 1.50V TO 1.40V, 100mV/div C. IL1, 10A/div D. IL2, 10A/div 10A LOAD B 1.1V C 5A 5A D 40µs/div A. D3, 5V/div B. VOUT = 1.50V TO 1.10V, 0.5V/div C. IL1, 10A/div D.
PAGE 14
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies MAX8760 Pin Description PIN NAME 1 TIME Slew-Rate Adjustment Pin. Connect a resistor from TIME to GND to set the internal slew-rate clock. A 150kΩ to 15kΩ resistor sets the clock from 100kHz to 1MHz, fSLEW = 500kHz x 30kΩ/RTIME. During startup and shutdown, the internal slew-rate clock operates at 1/4 the programmed rate. 2 TON On-Time Selection Control Input.
PAGE 15
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies PIN NAME FUNCTION 14 CCI Current Balance Compensation. Connect a 470pF capacitor between CCI and FB. See the Current Balance Compensation section. 15 FB Feedback Input. FB is internally connected to both the feedback input and the output of the voltagepositioning op amp. See the Setting Voltage Positioning section to set the voltage-positioning gain. 16 OAIN- Op Amp Inverting Input and Op Amp Disable Input.
PAGE 16
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies MAX8760 Pin Description (continued) PIN NAME FUNCTION 32 DLS Secondary Low-Side Gate-Driver Output. DLS swings from PGND to VDD. DLS is forced high after the MAX8760 powers down. 33 DHS Secondary High-Side Gate-Driver Output. Swings LXS to BSTS. 34 LXS Secondary Inductor Connection. LXS is the internal lower supply rail for the DHS high-side gate driver. 35 BSTS Secondary Boost Flying Capacitor Connection.
PAGE 17
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies MAX8760 Table 1. Component Selection for Standard Multiphase Applications MAX8760 AMD MOBILE COMPONENTS DESIGNATION Circuit of Figure 1 Input Voltage Range 7V to 24V VID Output Voltage (D5–D0) 1.3V (D5–D0 = 001010) Suspend Voltage (SUS, S0, S1) Not used (SUS = GND) Maximum Load Current 30A Number of Phases (ηTOTAL) Two phases Inductor (per Phase) 0.
PAGE 18
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies R12 100kΩ C1 2.2µF R13 10Ω C2 1µF POWER GOOD VROK D0 D1 D2 D3 D4 D5 DAC INPUTS V+ BSTM ON INPUT* 7V TO 24V CIN CBST1 0.22µF DHM NH1 R2 1kΩ ±1% GND RTIME 30.1kΩ TIME CCCV 47pF COUT NL1 PGND SHDN OFF RSENSE1 1.0mΩ L1 LXM DLM S0 S1 SUSPEND INPUTS (FOUR-LEVEL LOGIC) BST DIODES VDD VCC MAX8760 5V BIAS SUPPLY CMN CMP OAIN+ OAIN- R3 1kΩ ±1% R10 2kΩ ±1% CCV OUTPUT CREF 0.
PAGE 19
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies MAX8760 SHDN VID (D0–D5) DO NOT CARE SOFT-SHUTDOWN 1 LSB PER 4 RTIME CYCLES SOFT-START 1 LSB PER 4 RTIME CYCLES VCORE VROK tVROK(START) 5ms (TYP) Figure 2. Power-Up and Shutdown Sequence Timing Diagram Table 2. Component Suppliers MANUFACTURER PHONE WEBSITE BI Technologies 714-447-2345 (USA) www.bitechnologies.com Central Semiconductor 631-435-1110 (USA) www.centralsemi.com Coilcraft 800-322-2645 (USA) www.
PAGE 20
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Table 3. Operating Mode Truth Table SHDN SUS SKIP OFS OUTPUT VOLTAGE GND x x x GND Low-Power Shutdown Mode. DL_ is forced high, DH_ is forced low, and the PWM controller is disabled. The supply current drops to 1µA (typ). VCC GND VCC GND or REF D0–D5 (no offset) Normal Operation. The no-load output voltage is determined by the selected VID DAC code (D0–D5, Table 4).
PAGE 21
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies MAX8760 D0–D5 DECODER D0 D1 D2 SUSPEND MUX IN D3 D4 D5 OUT 0 S0, S1 DECODER S0 S1 IN OUT 1 OUT DAC SEL SEL SUS 2.5V SUS 3-LEVEL DECODER 1.0V Figure 3. Internal Multiplexers Functional Diagram The slew-rate controller transitions the output voltage in 12.5mV steps during soft-start, soft-shutdown, and suspend-mode transitions.
PAGE 22
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies SUS 1 LSB PER RTIME CYCLE VDAC OUTPUT SET BY D0–D4 OUTPUT SET BY SUS AND S0, S1 tSLEW tBLANK = 24 CLKS tSLEW tBLANK = 24 CLKS TIME CLOCK VROK VROK BLANKING VROK BLANKING Figure 4. Suspend Transition Fault Protection Output Overvoltage Protection The OVP circuit is designed to protect the CPU against a shorted high-side MOSFET by drawing high current and blowing the battery fuse.
PAGE 23
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies D5 D4 D3 D2 D1 D0 1 0 0 0 0 0 OUTPUT VOLTAGE (V) 0.7625 1.5250 1 0 0 0 0 1 0.7500 1.5000 1 0 0 0 1 0 0.7375 1 1.4750 1 0 0 0 1 1 0.7250 0 1.4500 1 0 0 1 0 0 0.7125 0 1 1.4250 1 0 0 1 0 1 0.7000 1 0 1.4000 1 0 0 1 1 0 0.6875 1 1 1 1.3750 1 0 0 1 1 1 0.6750 0 0 0 1.3500 1 0 1 0 0 0 0.6625 1 0 0 1 1.3250 1 0 1 0 0 1 0.
PAGE 24
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Table 5. Suspend Mode DAC Codes UPPER SUSPEND CODES LOWER SUSPEND CODES SUS S1 S0 OUTPUT VOLTAGE (V) SUS S1 S0 OUTPUT VOLTAGE (V) HIGH GND GND 0.800 REF GND GND 1.200 0.775 REF GND REF 1.175 HIGH GND REF HIGH GND OPEN 0.750 REF GND OPEN 1.150 HIGH GND VCC 0.725 REF GND VCC 1.125 HIGH REF GND 0.700 REF REF GND 1.100 HIGH REF REF 0.675 REF REF REF 1.
PAGE 25
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies MAX8760 BSTS CSN DHS SECONDARY PHASE DRIVERS CSP LXS DLS ILIM Q 19R CMP TRIG Gm ON-TIME ONE-SHOT R CMN CCI MINIMUM OFF-TIME CMP Q CSN TRIG Gm ONE-SHOT CMN FB VCC ON-TIME ONE-SHOT CSP V+ TON REF REF (2.0V) Q TRIG Q T Q SHDN MAIN PHASE DRIVERS R Q GND DHM S LXM S Q CMP CCV R CMN Gm BSTM 1.5mV VDD REF 1.
PAGE 26
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies On-Time One-Shot (TON) The core of each phase contains a fast, low-jitter, adjustable one-shot that sets the high-side MOSFETs on-time. The one-shot for the main phase varies the ontime in response to the input and feedback voltages. The main high-side switch on-time is inversely proportional to the input voltage as measured by the V+ input, and proportional to the feedback voltage (VFB): t ON(MAIN) = K (VFB + 0.
PAGE 27
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies  R  IMAIN - I2ND = IMAIN 1-  MAIN     R2ND   However, mismatches between on-times, off-times, and inductor values increase the worst-case current imbalance, making it impossible to passively guarantee accurate current balancing. The multiphase quick-PWM controller integrates the difference between the current-sense voltages and adjusts the on-time of the secondary phase to maintain current balance.
PAGE 28
Together, the feedback-sense resistor (R FBS ) and GNDS input sum the remote-sense voltages with the feedback signals that set the voltage-positioned output, enabling true differential remote sense of the processor voltage. Connect the feedback-sense resistor (R FBS) and ground-sense input (GNDS) directly to the processor’s core supply remote-sense outputs as shown in the Standard Applications Circuit.
PAGE 29
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Automatic Pulse-Skipping Switchover In skip mode (SKIP = REF or GND), an inherent automatic switchover to PFM takes place at light loads (Figure 7). A comparator that truncates the low-side switch on-time at the inductor current’s zero crossing affects this switchover. The zero-crossing comparator senses the inductor current across the current-sense resistors.
PAGE 30
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Since only the valley current is actively limited, the actual peak current is greater than the current-limit threshold by an amount equal to the inductor ripple current. Therefore, the exact current-limit characteristic and maximum load capability are a function of the current-sense resistance, inductor value, and battery voltage.
PAGE 31
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies For multiphase systems, each phase supports a fraction of the load, depending on the current balancing. When properly balanced, the load current is evenly distributed among each phase: ILOAD(PHASE) = • Input Undervoltage Lockout During startup, the VCC UVLO circuitry forces the DL gate driver high and the DH gate driver low, inhibiting switching until an adequate supply voltage is reached. Once VCC rises above 4.
PAGE 32
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Transient Response Output Capacitor Selection The inductor ripple current impacts transient-response performance, especially at low VIN - VOUT differentials. Low inductor values allow the inductor current to slew faster, replenishing charge removed from the output filter capacitors by a sudden load step.
PAGE 33
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies fESR ≤ fSW π where: fESR = 1 2πREFF COUT and: REFF = RESR + AVPSRSENSE + RPCB where COUT is the total output capacitance, RESR is the total equivalent-series resistance, R SENSE is the current-sense resistance, AVPS is the voltage-positioning gain, and R PCB is the parasitic board resistance between the output capacitors and sense resistors.
PAGE 34
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies Power MOSFET Selection Most of the following MOSFET guidelines focus on the challenge of obtaining high load-current capability when using high-voltage (>20V) AC adapters. Low-current applications usually require less attention. The high-side MOSFET (NH) must be able to dissipate the resistive losses plus the switching losses at both VIN(MIN) and VIN(MAX). Calculate both of these sums.
PAGE 35
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies CBST = N x QGATE 200mV where N is the number of high-side MOSFETs used for one regulator, and QGATE is the gate charge specified in the MOSFET’s data sheet. For example, assume two IRF7811W n-channel MOSFETs are used on the high side. According to the manufacturer’s data sheet, a single IRF7811W has a maximum gate charge of 24nC (VGS = 5V).
PAGE 36
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies CMN CMP MAIN PHASE L1 RSENSE MAX8760 RA RB PC BOARD TRACE RESISTANCE OAIN+ RFBS ERROR COMPARATOR CPU SENSE POINT OAINFB RF RA SECOND PHASE L2 RB PC BOARD TRACE RESISTANCE RSENSE CSP CSN Figure 10. Voltage-Positioning Gain slew the inductor current higher in response to increased load, and must always be greater than 1.
PAGE 37
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies PC Board Layout Guidelines Careful PC board layout is critical to achieve low switching losses and clean, stable operation. The switching power stage requires particular attention (Figure 11). If possible, mount all the power components on the top side of the board with their ground terminals flush against one another.
PAGE 38
MAX8760 Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies KELVIN SENSE VIAS UNDER THE SENSE RESISTOR (REFER TO EVALUATION KIT) CPU MAIN PHASE SECONDARY PHASE OUTPUT COUT RSENSE COUT COUT COUT COUT COUT RSENSE INDUCTOR INDUCTOR CIN CIN CIN CIN CIN CIN POWER GROUND INPUT PLACE CONTROLLER ON BACK SIDE WHEN POSSIBLE, USING THE GROUND PLANE TO SHIELD THE IC FROM EMI VIAS TO POWER GROUND CONNECT THE EXPOSED PAD TO ANALOG GND VIA TO ANALOG GROUND POWER GR
PAGE 39
Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies QFN THIN 6x6x0.8.EPS D2 D CL D/2 b D2/2 k E/2 E2/2 (NE-1) X e E CL E2 k e L (ND-1) X e e L CL CL L1 L L e A1 A2 e A PACKAGE OUTLINE 36, 40, 48L THIN QFN, 6x6x0.8mm 21-0141 E 1 2 NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4.