Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 5)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

_______________________________________________________________________________________ 5

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

ILIM(PK) Idle Current-Limit

Threshold Voltage (Skip Mode)

IDLE

C S P _ - C S N _, V

S KI P

≥ 1.2V ,

I LI M ( P K )

= R

T RC

x 8V / V

P KL IM IT

= 50m V

258mV

CSP_, CRSP

-0.2 +0.2

Current-Sense Input Current

CSN_, CRSN

-1.0 +1.0

µA

Current-Sense Common-Mode

Input Range

CRSP, CRSN, CSP_, CSN_ 0 2 V

Phase Disable Threshold CSP4 3

- 1

0.4

CRS Sense Input Disable

Threshold

CRSP 3

- 1

0.4

LOGIC AND I/O

Logic Input High Voltage V

SHDN, SUS 2.4 V

Logic Input Low Voltage V

SHDN, SUS 0.8 V

SHDN No-Fault Threshold To enable no-fault mode 11 13 V

D0–D4 Logic Input High Voltage

0.8 V

D0–D4 Logic Input Low Voltage 0.4 V

High (V

)

0.4

Medium (REF) 1.8 2.2

OSC 3-Level Input Logic Levels V

OSC

Low (GND) 0.4

High 1.2

SKIP Input Logic Levels V

SKIP

Low (GND) 0.8

Logic Input Current SHDN, SKIP, SUS, OSC, D0–D4 = 0 to 5V -1 +1 µA

Logic Output High Voltage V

PWM_, DRSKP; I

SOURCE

= 3mA

0.4

Logic Output Low Voltage V

PWM_, DRSKP; I

SINK

= 3mA 0.4 V

1 2 3 4 5 6 7 8 9 10 ... 36 37

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