Rainbow-electronics MAX17409 Manual de usuario descargar pdf

General Description

The MAX17409 is a 1-phase Quick-PWM™ step-down

VID power-supply controller for high-performance graph-

ics processors. The Quick-PWM control provides instan-

taneous response to fast-load current steps. Active

voltage positioning reduces power dissipation and bulk

output capacitance requirements and allows ideal posi-

tioning compensation for tantalum, polymer, or ceramic

bulk output capacitors.

The MAX17409 is intended for two different notebook

processor core applications: either bucking down the bat-

tery directly to create the core voltage, or bucking down

the +5V system supply. The single-stage conversion

method allows this device to directly step down high-volt-

age batteries for the highest possible efficiency.

Alternatively, 2-stage conversion (stepping down the +5V

system supply instead of the battery) at higher switching

frequency provides the minimum possible physical size.

A slew-rate controller allows controlled transitions

between VID codes. A thermistor-based temperature

sensor provides programmable thermal protection.

The MAX17409 is available in a 28-pin, 4mm x 4mm

TQFN package.

Applications

Graphics Core (GPU) Power Supplies

Voltage-Positioned Step-Down Converters

2-to-4 Li+ Cells Battery to Processor Core

Supply Converters

Notebooks/Desktops/Servers

Features

o 1-Phase Quick-PWM Controller

o ±6mV V

OUT

Accuracy Over Line, Load, and

Temperature

o 6-Bit Graphics DAC (12.5mV LSB)

o Active Voltage Positioning with Adjustable Gain

o Accurate Droop and Current Limit

o Remote Output and Ground Sense

o Buffered 2V Reference Output for Offsets

o Power-Good Window Comparator

o Temperature Comparator

o Drives Large Synchronous Rectifier FETs

o 2V to 26V Power Input Range

o Adjustable Switching Frequency (600kHz max)

o Output Overvoltage and Undervoltage Protection

o Soft-Startup and Soft-Shutdown

o Internal Boost Diodes

MAX17409

1-Phase Quick-PWM GPU Controller

________________________________________________________________

Maxim Integrated Products

GNDS/OFSP

CSN

CSP

SKIP

THRM

IMON

BST

PGND

REF

4567

2021 19 17 16 15

ILIM

SHDN

PWRGD

MAX17409

PAD

GND

CCV

TON

VRHOT

GND

THIN QFN

TOP VIEW

Pin Configuration

Ordering Information

19-4590; Rev 1; 7/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX17409GTI+ -40°C to +105°C 28 TQFN-EP*

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

1 2 3 4 5 6 ... 31 32

MAX17409 1

Indice de contenidos

Pagina 1 - MAX17409

General DescriptionThe MAX17409 is a 1-phase Quick-PWM™ step-downVID power-supply controller for high-performance graph-ics processors. The Quick-PWM

Pagina 2

MAX174091-Phase Quick-PWM GPU Controller10 ______________________________________________________________________________________Pin DescriptionPIN NA

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MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 11Pin Description (cont

Pagina 4

MAX174091-Phase Quick-PWM GPU Controller12 ______________________________________________________________________________________Pin Description (cont

Pagina 5

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 13OUTPUTSENSEGROUNDSENS

Pagina 6

MAX174091-Phase Quick-PWM GPU Controller14 ______________________________________________________________________________________SRQRSQTRIGQONE-SHOTPG

Pagina 7

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 15DESIGN PARAMETERS 14A

Pagina 8

MAX174091-Phase Quick-PWM GPU Controller16 ______________________________________________________________________________________Detailed DescriptionF

Pagina 9

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 17on-time by a period e

Pagina 10

MAX174091-Phase Quick-PWM GPU Controller18 ______________________________________________________________________________________SENSE RESISTORLMAX174

Pagina 11

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 19(Figure 2), allowing

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MAX174091-Phase Quick-PWM GPU Controller2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATI

Pagina 13

MAX174091-Phase Quick-PWM GPU Controller20 ______________________________________________________________________________________G5 G4 G3 G2 G1 G0 OUT

Pagina 14

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 21Output-Voltage Transi

Pagina 15

MAX174091-Phase Quick-PWM GPU Controller22 ______________________________________________________________________________________Forced-PWM Operation

Pagina 16

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 23Power-Up Sequence (PO

Pagina 17

MAX174091-Phase Quick-PWM GPU Controller24 ______________________________________________________________________________________ShutdownWhen SHDN goe

Pagina 18

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 25MOSFET Gate DriversTh

Pagina 19

MAX174091-Phase Quick-PWM GPU Controller26 ______________________________________________________________________________________capacitor selection,

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MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 27where:where RSENSE is

Pagina 21

MAX174091-Phase Quick-PWM GPU Controller28 ______________________________________________________________________________________In applications that

Pagina 22

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 29driver can supply suf

Pagina 23

MAX174091-Phase Quick-PWM GPU Controller_______________________________________________________________________________________ 3PARAMETER SYMBOL CON

Pagina 24

MAX174091-Phase Quick-PWM GPU Controller30 ______________________________________________________________________________________Applications Informat

Pagina 25

MAX174091-Phase Quick-PWM GPU Controller______________________________________________________________________________________ 31Package InformationFo

Pagina 26

MAX174091-Phase Quick-PWM GPU ControllerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim

Pagina 27

ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, SHDN = ILIM = VCC, SKIP = GNDS = PGND = GND, VFB= VCSP= VCSN= 1.05

Pagina 28

ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, SHDN = ILIM = VCC, SKIP = GNDS = PGND = GND, VFB= VCSP= VCSN= 1.05

Pagina 29

MAX174091-Phase Quick-PWM GPU Controller6 _______________________________________________________________________________________ELECTRICAL CHARACTERI

Pagina 30

MAX174091-Phase Quick-PWM GPU Controller_______________________________________________________________________________________ 7ELECTRICAL CHARACTERI

Pagina 31

MAX174091-Phase Quick-PWM GPU Controller8 _______________________________________________________________________________________0.9V OUTPUT EFFICIENC

Pagina 32

MAX174091-Phase Quick-PWM GPU Controller_______________________________________________________________________________________9Gm(IMON) TRANSCONDUCTA

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