Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 2)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

to GND..............................................................-0.3V to +6V

D0–D4 to GND..........................................................-0.3V to +6V

SKIP, SUS, VROK, ILIM(AVE) to GND......................-0.3V to +6V

SUSV, OFS, OSC to GND.........................................-0.3V to +6V

CSP_, CSN_, CRSP, CRSN to GND .........................-0.3V to +6V

VPS, FBS, CCV, REF to GND .....................-0.3V to (V

+ 0.3V)

ILIM(PK), TRC, TIME to GND .....................-0.3V to (V

+ 0.3V)

PWM_,

DRSKP to PGND ............................-0.3V to (V

+ 0.3V)

PGND, GNDS to GND ...........................................-0.3V to +0.3V

SHDN to GND (Note 1)...........................................-0.3V to +14V

REF Short-Circuit Duration .........................................Continuous

Continuous Power Dissipation (T

= +70°C)

40-Pin 6mm x 6mm Thin QFN

(derate 26.3mW/°C above +70°C)................................2.105W

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1. V

= V

SHDN

= 5V, OSC = REF, V

VPS

= V

FBS

= V

CRSN

= V

CRSP

= V

CSP_

= 1.20V, V

SUSV

= 0.8V, OFS = SUS =

GNDS = PGND = SKIP = GND, D0–D4 set for 1.20V (D0–D4 = 01110). T

= 0°C to +85°C, unless otherwise specified. Typical values

are at T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

PWM CONTROLLER

Input Voltage Range V

4.5 5.5 V

DAC codes from

1.10V to 1.55V

-0.75 +0.75

DAC codes from

0.80V to 1.075V

-2.0 +2.0

DC Output Voltage Accuracy V

OUT

Includes load-

regulation error

(VPS = FBS)

SUS = V

-20

+20

SUSV Input Range V

SUSV

0.4 2.0 V

SUSV Input-Bias Current I

SUSV

= 0.4V to 2V

-0.1 +0.1

µA

Negative offsets 0 0.8

OFS Input Range V

OFS

Positive offsets 1.2 2.0

∆V

OUT

/ ∆V

OFS

, ∆V

OFS

= V

OFS

= 0 to 0.8V

-0.131 -0.125 -0.118

OFS GAIN A

OFS

∆V

OUT

/ ∆V

OFS

, ∆V

OFS

= V

OFS

-V

REF

OFS

= 1.2V to 2V

-0.131 -0.125 -0.118

V/V

OFS Input-Bias Current I

OFS

= 0 to 2V

-0.1 +0.1

µA

GNDS Input Range V

GNDS

-200 +200

GNDS Gain A

GNDS

∆V

OUT

/ ∆V

GNDS

-200mV ≤ V

GNDS

≤ +200mV

0.95 1.00 1.05

V/V

GNDS Input-Bias Current I

GNDS

-2 +2 µA

FBS Input-Bias Current I

FBS

CRSP = CRSN, CSP_ = CSN_ -10

+10

µA

OSC = GND

180 200 220

OSC = REF

270 300 330

Switching Frequency Accuracy

(Per Phase)

OSC = V

540 600 660

kHz

Note 1: SHDN can be forced to 12V for debugging prototype boards using the no-fault test mode, which disables fault protection.

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