MAX8707 Просмотр технического описания (PDF) - Maxim Integrated

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MAX8707

Multiphase, Fixed-Frequency Controller for AMD Hammer CPU Core Power Supplies

Maxim Integrated 

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. VCC = VSHDN = 5V, OSC = REF, VVPS = VFBS = VCRSN = VCRSP = VCSP_ = 1.20V, VSUSV = 0.8V, OFS = SUS =

GNDS = PGND = SKIP = GND, D0–D4 set for 1.20V (D0–D4 = 01110). TA = 0°C to +85°C, unless otherwise specified. Typical values

are at TA = +25°C.)

PARAMETER

TIME Slew-Rate Accuracy

SYMBOL

CONDITIONS

RTIME = 143kΩ (6.25mV/µs)

RTIME = 47kΩ (19mV/µs) to 392kΩ

(2.28mV/µs)

MIN TYP MAX UNITS

-10

+10

-15

+15

%

Startup and shutdown, RTIME = 47kΩ

(4.75mV/µs) to 392kΩ (0.57mV/µs)

-20

+20

BIAS AND REFERENCE

Quiescent Supply Current (VCC)

Shutdown Supply Current (VCC)

Reference Voltage

Reference Load Regulation

FAULT PROTECTION

ICC

ICC(SHDN)

VREF

∆VREF

Measured at VCC, VPS and FBS forced

above the regulation points

Measured at VCC, SHDN = GND

VCC = 4.5V to 5.5V, IREF = 0

IREF = 0 to 500µA

IREF = -100µA to 0

7

12

mA

0.05

10

µA

1.986 2.000 2.014

V

-2

-0.2

mV

0.21 6.2

Output Overvoltage-Protection

Threshold

Measured at VPS

PWM (SKIP = GND)

with respect to

or SKIP mode when 150 200 250

mV

VOVP

unloaded output

voltage, rising edge,

8mV hysteresis

VOUT ≤ VTRIP

SKIP = VCC and

VOUT > VTRIP

1.70 1.75 1.80

V

Minimum OVP level

1.1

Output Overvoltage Propagation

Delay

tOVP VPS forced 25mV above trip threshold

10

µs

Output Undervoltage-Protection

Threshold

VUVP

Measured at VPS with respect to 70% of the

unloaded nominal output voltage

-30

+30

mV

Output Undervoltage

Propagation Delay

tUVP VPS forced 25mV below trip threshold

10

µs

Measured from the time when VPS reaches

VROK Transition Blanking Time

tBLANK the target voltage, slew rate set by RTIME

(Note 2)

20

µs

VROK Threshold

Undervoltage measured at VPS with

respect to 87.5% unloaded output voltage,

-30

falling edge, 15mV hysteresis

Overvoltage measured at VPS with respect

to 112.5% of the unloaded output voltage,

-30

rising edge, 15mV hysteresis

+30

mV

+30

VROK Delay

VROK Output Low Voltage

VROK Leakage Current

tVROK

VPS forced 25mV outside the VROK trip

thresholds

ISINK = 3mA

High state, VROK forced to 5.5V

10

µs

0.4

V

1

µA

_______________________________________________________________________________________ 3

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