Rainbow-electronics MAX8707 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

6 _______________________________________________________________________________________

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

= -40°C to +85°C, unless otherwise specified.) (Note 3)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

PWM CONTROLLER

Input Voltage Range V

4.5 5.5 V

DAC codes from

1.10V to 1.55V

-1.0 +1.0

DAC codes from

0.80V to 1.075V

-3.0 +3.0

DC Output Voltage Accuracy V

OUT

Includes load-

regulation error

(VPS = FBS)

SUS = V

-25

+25

SUSV Input Range V

SUSV

0.4 2.0 V

Negative offsets 0 0.8

OFS Input Range V

OFS

Positive offsets 1.2 2.0

∆V

OUT

/ ∆V

OFS

; ∆V

OFS

= V

OFS,

OFS

= 0 to 0.8V

-0.131 -0.118

OFS GAIN A

OFS

∆V

OUT

/ ∆V

OFS

; ∆V

OFS

= V

OFS

- V

REF,

OFS

= 1.2V to 2V

-0.131 -0.118

V/V

GNDS Input Range V

GNDS

-200 +200

GNDS Gain A

GNDS

∆V

OUT

/ ∆V

GNDS

-200mV ≤ V

GNDS

≤ +200mV

0.95 1.05

V/V

OSC = GND

180 220

OSC = REF

270 330

Switching Frequency Accuracy

(Per Phase)

OSC = V

540 660

kHz

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

12 mA

Shutdown Supply Current (V

)

(

SHDN

)

Measured at V

, SHDN = GND 10 µA

Reference Voltage V

REF

= 4.5V to 5.5V, I

REF

= 0

1.98 2.02

REF

= 0 to 500µA -2 mV

Reference Load Regulation ∆V

REF

= -100µA to 0 6.2 mV

FAULT PROTECTION

PWM (SKIP = GND)

or SKIP mode when

OUT

≤ V

TRIP

150 250

Output Overvoltage-Protection

Threshold

OVP

Measured at VPS

with respect to

unloaded output

voltage, rising edge,

8mV hysteresis

SKIP = V

and

OUT

> V

TRIP

1.70 1.80

1 2 3 4 5 6 7 8 9 10 11 ... 36 37

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