Rainbow-electronics MAX8707 Manual de usuario descargar pdf (Pagina 7)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

_______________________________________________________________________________________ 7

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN MAX

UNITS

Output Undervoltage-Protection

Threshold

UVP

Measured at VPS with respect to 70% of the

unloaded nominal output voltage

-40

+40

Undervoltage, measured at VPS with

respect to 87.5% of the unloaded output

voltage, falling edge, 15mV hysteresis

-40

+40

VROK Threshold

Overvoltage, measured at VPS with respect

to 112.5% of the unloaded output voltage,

rising edge, 15mV hysteresis

-40

+40

VROK Output Low Voltage I

SINK

= 3mA 0.4 V

Undervoltage-Lockout

Threshold

UVLO

(

VCC

)

Rising edge, hysteresis = 20mV, PWM_

disabled below this level

4.10 4.45

DROOP AND TRANSIENT RESPONSE

DC Droop Amplifier Offset -2 +2 mV

DC Droop Amplifier

Transconductance

(CRS Sense Enabled)

(

VPS

)

∆I

VPS

/ (N x ∆V

CRS

); V

VPS

= V

CRSN

= 1.2V,

CRSP

- V

CRSN

= -60mV to +60mV,

N = number of phases enabled

190 210

µS

DC Droop Amplifier

Transconductance

(CRS Sense Disabled)

(

VPS

)

∆I

VPS

/ (Σ∆V

), V

CRSP

= V

VPS

= V

CSN

_ = 1.2V,

CSP

_ - V

CSN

_ = -60mV to +60mV

190 210

µS

Transient-Droop Transresistance

TRANS

Current-sense gain (A

= 10 typ) divided

by the voltage preamplifier

transconductance (G

m(TRC)

= 2mS typ)

4.50 5.25

kΩ

CURRENT LIMIT AND BALANCE

Current-Sense Input Preamplifier

Offsets

CSP_ - CSN_

-2.5 +2.5

ILIM(AVE)

Input Range

(Adjustable Mode)

ILIM

(

AVE

)

REF

- 1.0

REF

- 0.2

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Default)

AVELIMIT

CRSP - CRSN; ILIM(AVE)

= V

20 30 mV

ILIM

(

AVE

)

= V

REF

- 0.2V

515

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Adjustable)

AVELIMIT

CRSP - CRSN

ILIM

(

AVE

)

= V

REF

- 1.0V

44 56

ILIM(AVE) Average Current-Limit

Threshold Voltage (Negative)

CRSP - CRSN; ILIM(AVE) = V

-31 -19 mV

ILIM(AVE) Current-Limit Default

Switchover Threshold

- 0.4

1 2 3 4 5 6 7 8 9 10 11 12 ... 36 37

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Rainbow-electronics MAX8707 Manual de usuario Pagina 7

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