Rainbow-electronics MAX8760 User Manual download pdf

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.

1 2 3 4 5 6 ... 38 39

Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX8760 is a dual-phase, Quick-PWM™, step-down controller for 6-bit VID AMD Mobile Turion™ 64CPU core supplies. Dual-phase oper

Page 2 - ELECTRICAL CHARACTERISTICS

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies10 ____________________________________________________________

Page 3

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 4

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies12 ____________________________________________________________

Page 5

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 6

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies14 ____________________________________________________________

Page 7

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 8

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies16 ____________________________________________________________

Page 9

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 10 - MAX8760 toc14

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies18 ____________________________________________________________

Page 11 - MAX8760 toc17

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 12 - MAX8760 toc25

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies2 _____________________________________________________________

Page 13 - 400mV DAC CODE TRANSITION

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies20 ____________________________________________________________

Page 14 - Pin Description

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 15 - Pin Description (continued)

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies22 ____________________________________________________________

Page 16 - Detailed Description

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 17 - Shutdown

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies24 ____________________________________________________________

Page 18

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 19 - Table 2. Component Suppliers

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies26 ____________________________________________________________

Page 20 - Suspend Mode

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 21

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies28 ____________________________________________________________

Page 22 - Fault Protection

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 23

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 24 - Multiphase Quick-PWM

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies30 ____________________________________________________________

Page 25

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 26 - On-Time One-Shot (TON)

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies32 ____________________________________________________________

Page 27 - Current Balance

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 28 - Settings*

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies34 ____________________________________________________________

Page 29 - Current-Limit Circuit

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 30 - Power-On Reset

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies36 ____________________________________________________________

Page 31 - Design Procedure

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 32 - Output Capacitor Selection

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies38 ____________________________________________________________

Page 33 - Input Capacitor Selection

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power SuppliesMaxim cannot assume responsibility for use of any circuitry oth

Page 34 - Boost Capacitors

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies4 _____________________________________________________________

Page 35 - Setting Voltage Positioning

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 36 - COMPARATOR

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies6 _____________________________________________________________

Page 37 - Chip Information

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

Page 38

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies8 _____________________________________________________________

Page 39 - Package Information

MAX8760Dual-Phase, Quick-PWM Controller for AMDMobile Turion 64 CPU Core Power Supplies_______________________________________________________________

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Rainbow-electronics MAX8760 User Manual

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Summary of Contents

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