Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 4)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

4 _______________________________________________________________________________________

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

Undervoltage-Lockout

Threshold

UVLO

(

VCC

)

Rising edge, hysteresis = 20mV, PWM_

disabled below this level

4.10 4.25 4.45

Thermal-Shutdown Threshold T

SHDN

Rising edge hysteresis = 15°C

+160

°C

DROOP AND TRANSIENT RESPONSE

DC Droop Amplifier Offset

-1.5 +1.5

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

194 200 206

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

194 200 206

µS

Transient-Droop Transresistance

TRANS

Current-sense gain (A

= 10 typ) divided

by the voltage preamplifier

transconductance (G

m(TRC)

= 2ms typ)

4.75

5.0

5.25

kΩ

Transient Detection Threshold

Measured at VPS with respect to steady-

state VPS regulation voltage; falling edge,

5.5mV hysteresis (typ)

-30 -25 -20 mV

CURRENT LIMIT AND BALANCE

Current-Sense Input Preamplifier

Offsets

CSP_ - CSN_

-2.0 +2.0

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

22 25 28 mV

ILIM

(

AVE

)

= V

REF

- 0.2V

71013

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Adjustable)

AVELIMIT

CRSP - CRSN

ILIM

(

AVE

)

= V

REF

- 1.0V

46 50 54

ILIM(AVE)

Average Current-Limit

Threshold Voltage (Negative)

CRSP - CRSN; ILIM(AVE) = V

-30 -25 -20 mV

ILIM(AVE) Input Current

ILIM

(

AVE

)

-0.1 +0.1

µA

ILIM(AVE) Current-Limit Default

Switchover Threshold

- 1.0

- 0.4

PKLIMIT

= 30mV 24 30 36

ILIM(PK)

Peak Current-Limit

Threshold Voltage (Positive)

PKLIMIT

CSP_ - CSN_,

ILIM(PK)

= R

TRC

8V / V

LIM(PK)

PKLIMIT

= 50mV 40 50 60

ILIM(PK) Peak Current-Limit

Threshold Voltage (Negative)

CSP_ - CSN_, R

ILIM(PK)

= R

TRC

x 8V /

PKLIMIT

, V

PKLIMIT

= 50mV

-60 -50 -40 mV

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

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