MAX8707 datasheet(8/37 Pages) MAXIM

8 / 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 = -40°C to +85°C, unless otherwise specified.) (Note 3)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

VPKLIMIT = 30mV

ILIM(PK) Peak Current-Limit

Threshold Voltage (Positive)

VPKLIMIT

CSP_ - CSN_,

RILIM(PK) = RTRC x

8V / VLIM(PK)

VPKLIMT = 50mV

ILIM(PK) Peak Current-Limit

Threshold Voltage (Negative)

CSP_ - CSN_,

RILIM(PK) = RTRC x 8V / VPKLIMIT,

VPKLIMIT = 50mV

-60

-40

ILIM(PK) Idle Current-Limit

Threshold Voltage (Skip Mode)

VIDLE

CSP_ - CSN_, VSKIP

≥ 1.2V,

RILIM(PK) = RTRC x 8V / VPKLIMIT,

VPKLIMIT = 50mV

CSP_, CRSP

-0.2

+0.2

Current-Sense Input Current

CSN_, CRSN

-1.0

+1.0

µA

Current-Sense Common-Mode

Input Range

CRSP, CRSN, CSP_, CSN_

Phase Disable Threshold

CSP4

VCC

- 0.4

CRS Sense Input Disable

Threshold

CRSP

VCC

- 0.4

LOGIC AND I/O

Logic Input High Voltage

VIH

SHDN, SUS

2.4

Logic Input Low Voltage

VIL

SHDN, SUS

0.8

D0–D4 Logic Input High Voltage

0.8

D0–D4 Logic Input Low Voltage

0.4

High (VCC)

VCC

- 0.4

Medium (REF)

1.8

2.2

OSC 3-Level Input Logic Levels

VOSC

Low (GND)

0.4

High

1.2

SKIP Input Logic Levels

VSKIP

Low (GND)

0.8

Logic Output High Voltage

VOH

PWM_, DRSKP; ISOURCE = 3mA

VCC

- 0.4

Note 2: VROK is blanked during the transitions, when the internal target is being slewed. See the Output-Voltage Transition Timing

section. VROK is reenabled in tBLANK (20µs) after the transition is completed.

Note 3: Specifications to TA = -40°C are guaranteed by design and are not production tested.

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