MAX8707 datasheet(4/37 Pages) MAXIM

4 / 37 page

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

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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

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VCC Undervoltage-Lockout

Threshold

VUVLO(VCC)

Rising edge, hysteresis = 20mV, PWM_

disabled below this level

4.10

4.25

4.45

Thermal-Shutdown Threshold

TSHDN

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)

Gm(VPS)

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

VCRSP - VCRSN = -60mV to +60mV,

N = number of phases enabled

194

200

206

µS

DC Droop Amplifier

Transconductance

(CRS Sense Disabled)

Gm(VPS)

∆IVPS / (Σ∆VCS), VCRSP = VCC,

VVPS = VCSN_ = 1.2V,

VCSP_ – VCSN_ = -60mV to +60mV

194

200

206

µS

Transient-Droop Transresistance

RTRANS

Current-sense gain (ACS = 10 typ) divided

by the voltage preamplifier

transconductance (Gm(TRC) = 2ms typ)

4.75

5.0

5.25

Ω

Transient Detection Threshold

Measured at VPS with respect to steady-

state VPS regulation voltage; falling edge,

5.5mV hysteresis (typ)

-30

-25

-20

CURRENT LIMIT AND BALANCE

Current-Sense Input Preamplifier

Offsets

CSP_ - CSN_

-2.0

+2.0

ILIM(AVE) Input Range

(Adjustable Mode)

VILIM(AVE)

VREF

- 1.0

VREF

- 0.2

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Default)

VAVELIMIT

CRSP - CRSN; ILIM(AVE) = VCC

VILIM(AVE) = VREF - 0.2V

710

ILIM(AVE) Average Current-Limit

Threshold Voltage

(Positive, Adjustable)

VAVELIMIT

CRSP - CRSN

VILIM(AVE) = VREF - 1.0V

ILIM(AVE) Average Current-Limit

Threshold Voltage (Negative)

CRSP - CRSN; ILIM(AVE) = VCC

-30

-25

-20

ILIM(AVE) Input Current

IILIM(AVE)

-0.1

+0.1

µA

ILIM(AVE) Current-Limit Default

Switchover Threshold

VCC

- 1.0

VCC

- 0.4

VPKLIMIT = 30mV

ILIM(PK) Peak Current-Limit

Threshold Voltage (Positive)

VPKLIMIT

CSP_ - CSN_,

RILIM(PK) = RTRC x

8V / VLIM(PK)

VPKLIMIT = 50mV

ILIM(PK) Peak Current-Limit

Threshold Voltage (Negative)

CSP_ - CSN_, RILIM(PK) = RTRC x 8V /

VPKLIMIT, VPKLIMIT = 50mV

-60

-50

-40

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