Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 3)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(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

TIME

= 143kΩ (6.25mV/µs) -10

+10

TIME

= 47kΩ (19mV/µs) to 392kΩ

(2.28mV/µs)

-15

+15

TIME Slew-Rate Accuracy

Startup and shutdown, R

TIME

= 47kΩ

(4.75mV/µs) to 392kΩ (0.57mV/µs)

-20

+20

BIAS AND REFERENCE

Quiescent Supply Current (V

)

Measured at V

, VPS and FBS forced

above the regulation points

712mA

Shutdown Supply Current (V

)

(

SHDN

)

Measured at V

, SHDN = GND

0.05

10 µA

Reference Voltage V

REF

= 4.5V to 5.5V, I

REF

= 0

1.986 2.000 2.014

REF

= 0 to 500µA -2

-0.2

Reference Load Regulation ∆V

REF

= -100µA to 0

0.21

6.2

FAULT PROTECTION

PWM (SKIP = GND)

or SKIP mode when

OUT

≤ V

TRIP

150 200 250

Measured at VPS

with respect to

unloaded output

voltage, rising edge,

8mV hysteresis

SKIP = V

and

OUT

> V

TRIP

1.70 1.75 1.80

Output Overvoltage-Protection

Threshold

OVP

Minimum OVP level 1.1

Output Overvoltage Propagation

Delay

OVP

VPS forced 25mV above trip threshold 10 µs

Output Undervoltage-Protection

Threshold

UVP

Measured at VPS with respect to 70% of the

unloaded nominal output voltage

-30

+30

Output Undervoltage

Propagation Delay

UVP

VPS forced 25mV below trip threshold 10 µs

VROK Transition Blanking Time t

BLANK

Measured from the time when VPS reaches

the target voltage, slew rate set by R

TIME

(Note 2)

20 µs

Undervoltage measured at VPS with

respect to 87.5% unloaded output voltage,

falling edge, 15mV hysteresis

-30

+30

VROK Threshold

Overvoltage measured at VPS with respect

to 112.5% of the unloaded output voltage,

rising edge, 15mV hysteresis

-30

+30

VROK Delay t

VROK

VPS forced 25mV outside the VROK trip

thresholds

10 µs

VROK Output Low Voltage I

SINK

= 3mA 0.4 V

VROK Leakage Current High state, VROK forced to 5.5V 1 µA

1 2 3 4 5 6 7 8 ... 36 37

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