MAX8707 查看數據表（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 = -40°C to +85°C, unless otherwise specified.) (Note 3)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX UNITS

Output Undervoltage-Protection

Threshold

VUVP

Measured at VPS with respect to 70% of the

unloaded nominal output voltage

-40

+40

mV

VROK Threshold

Undervoltage, measured at VPS with

respect to 87.5% of the unloaded output

-40

voltage, falling edge, 15mV hysteresis

Overvoltage, measured at VPS with respect

to 112.5% of the unloaded output voltage,

-40

rising edge, 15mV hysteresis

VROK Output Low Voltage

ISINK = 3mA

VCC Undervoltage-Lockout

Threshold

VUVLO(VCC)

Rising edge, hysteresis = 20mV, PWM_

disabled below this level

4.10

DROOP AND TRANSIENT RESPONSE

DC Droop Amplifier Offset

-2

DC Droop Amplifier

Transconductance

(CRS Sense Enabled)

∆IVPS / (N x ∆VCRS); VVPS = VCRSN = 1.2V,

Gm(VPS) VCRSP - VCRSN = -60mV to +60mV,

190

N = number of phases enabled

+40

mV

+40

0.4

V

4.45

V

+2

mV

210

µS

DC Droop Amplifier

Transconductance

(CRS Sense Disabled)

∆IVPS / (Σ∆VCS), VCRSP = VCC,

Gm(VPS) VVPS = VCSN_ = 1.2V,

190

VCSP_ - VCSN_ = -60mV to +60mV

210

µS

Transient-Droop Transresistance RTRANS

CURRENT LIMIT AND BALANCE

Current-Sense Input Preamplifier

Offsets

Current-sense gain (ACS = 10 typ) divided

by the voltage preamplifier

transconductance (Gm(TRC) = 2mS typ)

CSP_ - CSN_

ILIM(AVE) Input Range

(Adjustable Mode)

VILIM(AVE)

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Default)

VAVELIMIT CRSP - CRSN; ILIM(AVE) = VCC

4.50

-2.5

VREF

- 1.0

20

5.25

kΩ

+2.5

mV

VREF

V

- 0.2

30

mV

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Adjustable)

VAVELIMIT CRSP - CRSN

VILIM(AVE) = VREF - 0.2V

5

VILIM(AVE) = VREF - 1.0V 44

ILIM(AVE) Average Current-Limit

Threshold Voltage (Negative)

CRSP - CRSN; ILIM(AVE) = VCC

-31

ILIM(AVE) Current-Limit Default

Switchover Threshold

3

15

mV

56

-19

mV

VCC

- 0.4

V

_______________________________________________________________________________________ 7

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