Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX8707 is a multiphase (3-/4-phase), interleaved,

fixed-frequency, step-down controller for AMD Hammer

CPU core supplies. Interleaved multiphase operation

reduces the input ripple current and output voltage ripple

while easing component selection and layout placement.

The MAX8707 includes active voltage positioning with

adjustable gain and offset, reducing power dissipation

and bulk output-capacitance requirements.

The MAX8707 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 these devices to directly step down

high-voltage batteries for the highest possible efficien-

cy. Alternatively, 2-stage conversion (stepping down

the +5V system supply instead of the battery) at higher

switching frequency provides the minimum possible

physical size.

The MAX8707 features dedicated differential current-

sense inputs for each phase and includes a fifth pair of

current-sense inputs to provide an accurate voltage-

positioning slope and average current-limit protection

using a single current-sense resistor. The MAX8707 also

has two dedicated inputs that provide differential remote

voltage sensing.

The MAX8707 provides an analog input for setting the

suspend voltage and a slew-rate controller for transi-

tions between VID codes or the suspend voltage. The

controllers reduce the transition slew rate during startup

and shutdown, providing soft-start with minimal input

surge current and damped soft-shutdown without nega-

tive output undershoot. The MAX8707 includes output

fault protection—undervoltage, nonlatched overvoltage,

and thermal overload—and an independent voltage-

regulator power-OK (VROK) output.

The MAX8707 has a selectable switching frequency,

allowing 200kHz, 300kHz, or 600kHz per-phase opera-

tion. The MAX8707 is available in the low-profile, 40-pin,

6mm x 6mm thin QFN package. Refer to the MAX8702/

MAX8703 for compatible drivers.

Features

♦ 3-/4-Phase Interleaved Fixed-Frequency

Controller

♦ ±0.75% V

OUT

Accuracy Over Line, Load, and

Temperature

♦ 5-Bit On-Board Digital-to-Analog Converter

(DAC)—0.80V to 1.55V

♦ Adjustable Suspend Voltage Input

♦ Active Voltage Positioning with Adjustable Gain

and Offset

♦ Accurate Lossless Current Balance

♦ Accurate Droop and Current Limit

♦ Remote Output and Ground Sense

♦ Output Slew-Rate Control

♦ Power-Good Window Comparator

♦ Selectable 200kHz/300kHz/600kHz Switching

Frequency

♦ Output Overvoltage and Undervoltage Protection

♦ Thermal Fault Protection

♦ 2V ±0.7% Reference Output

♦ Soft-Startup and Shutdown

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3360; Rev 0; 8/04

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX8707ETL

-40°C to +85°C

40 Thin QFN 6mm x 6mm

Applications

AMD Hammer Desknote Computers

Multiphase CPU Core Supplies

Voltage-Positioned Step-Down Converters

Notebook/Desktop Computers

Servers

Pin Configuration appears at end of data sheet.

1 2 3 4 5 6 ... 36 37

Resumo do Conteúdo

Página 1 - Applications

General DescriptionThe MAX8707 is a multiphase (3-/4-phase), interleaved,fixed-frequency, step-down controller for AMD HammerCPU core supplies. Interl

Página 2 - ELECTRICAL CHARACTERISTICS

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies10 ________________________________________________________________

Página 3

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 4 - CSP_ - CSN_

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies12 ________________________________________________________________

Página 5

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 6

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies14 ________________________________________________________________

Página 7 - -2 +2 mV

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 8

MAX8707Detailed Description+5V Bias Supply (VCC)The MAX8707 requires an external +5V bias supply inaddition to the battery. Typically, this +5V bias s

Página 9

Switching Frequency (OSC)OSC is a 3-level logic input used to set the per-phaseswitching frequency. Connect OSC directly to GND,REF, or VCCfor 200kHz,

Página 10

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies18 ________________________________________________________________

Página 11

Transient-Droop AmplifierThe MAX8707 controller includes a transient-drooptransconductance amplifier to handle the instantaneousload transients typica

Página 12 - MAX8707 toc25

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies2 _________________________________________________________________

Página 13 - Pin Description

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies20 ________________________________________________________________

Página 14 - Pin Description (continued)

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 15

MAX8707to 2V, the offset amplifier adds a positive offset to theoutput that is equal to 1/8th the difference between thereference voltage and the volt

Página 16 - Detailed Description

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 17 - Switching Frequency (OSC)

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies24 ________________________________________________________________

Página 18

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 19

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies26 ________________________________________________________________

Página 20

results in high light-load efficiency. Trade-offs in PFMnoise vs. light-load efficiency are made by varying theinductor value. Generally, low inductor

Página 21 - Table 2. Component Suppliers

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies28 ________________________________________________________________

Página 22

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 23

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 24

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies30 ________________________________________________________________

Página 25

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 26 - Table 5. SKIP Settings

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies32 ________________________________________________________________

Página 27 - Peak/Average Current Limit

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 28 - Shutdown

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies34 ________________________________________________________________

Página 29 - Fault Protection

This is essential for high-power MOSFETs thatrequire low-impedance gate drivers to avoid shoot-through currents.7) When trade-offs in trace lengths mu

Página 30 - Design Procedure

Chip InformationTRANSISTOR COUNT: 9011PROCESS: BiCMOSMAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies36 ___________

Página 31 - Output-Capacitor Selection

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power SuppliesMaxim cannot assume responsibility for use of any circuitry other t

Página 32 - Setting Voltage Positioning

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies4 _________________________________________________________________

Página 33 - Applications Information

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 34

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies6 _________________________________________________________________

Página 35 - Layout Procedure

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

Página 36 - Pin Configuration

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies8 _________________________________________________________________

Página 37 - Package Information

MAX8707Multiphase, Fixed-Frequency Controller forAMD Hammer CPU Core Power Supplies___________________________________________________________________

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