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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

(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

PWM CONTROLLER

Input Voltage Range

VCC

4.5

5.5

V

DC Output Voltage Accuracy

Includes load-

DAC codes from

-1.0

1.10V to 1.55V

VOUT

regulation error

(VPS = FBS)

DAC codes from

0.80V to 1.075V

-3.0

+1.0

%

+3.0

SUSV Input Range

OFS Input Range

SUS = VCC

-25

VSUSV

0.4

Negative offsets

0

VOFS

Positive offsets

1.2

+25

mV

2.0

V

0.8

V

2.0

OFS GAIN

AOFS

∆VOUT / ∆VOFS; ∆VOFS = VOFS,

VOFS = 0 to 0.8V

∆VOUT / ∆VOFS; ∆VOFS = VOFS - VREF,

VOFS = 1.2V to 2V

-0.131

-0.131

-0.118

V/V

-0.118

GNDS Input Range

VGNDS

-200

+200 mV

GNDS Gain

AGNDS

∆VOUT / ∆VGNDS,

-200mV ≤ VGNDS ≤ +200mV

0.95

1.05

V/V

Switching Frequency Accuracy

(Per Phase)

OSC = GND

fSW

OSC = REF

OSC = VCC

RTIME = 143kΩ (6.25mV/µs)

180

220

270

330

kHz

540

660

-10

+10

TIME Slew-Rate Accuracy

RTIME = 47kΩ (19mV/µs) to 392kΩ

-15

(2.28mV/µs)

+15

%

Startup and shutdown, RTIME = 47kΩ

(4.75mV/µs) to 392kΩ (0.57mV/µs)

-20

+20

BIAS AND REFERENCE

Quiescent Supply Current (VCC)

ICC

Measured at VCC, VPS and FBS forced

above the regulation points

Shutdown Supply Current (VCC) ICC(SHDN) Measured at VCC, SHDN = GND

Reference Voltage

VREF VCC = 4.5V to 5.5V, IREF = 0

1.98

Reference Load Regulation

∆VREF IREF = 0 to 500µA

-2

IREF = -100µA to 0

FAULT PROTECTION

12

mA

10

µA

2.02

V

mV

6.2

mV

Output Overvoltage-Protection

Threshold

Measured at VPS

PWM (SKIP = GND)

with respect to

or SKIP mode when 150

VOVP unloaded output

VOUT ≤ VTRIP

voltage, rising edge, SKIP = VCC and

8mV hysteresis

VOUT > VTRIP

1.70

250

mV

1.80

V

6 _______________________________________________________________________________________

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