MAX8772 datasheet(3/47 Pages) MAXIM

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MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-

PWM Controller for IMVP-6+ CPU Core Power Supplies

_______________________________________________________________________________________

CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL® IMVP-6 LICENSEES

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. VDD = VCC = VSHDN = VPSI = VDPRSTP = 5V, DPRSLPVR = GNDS = PGND_ = GND, VFB = VCCI = VCSP_ = VCSN_

= 1.200V, D0–D6 set for 1.20V (D0–D6 = 0001100). TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RTIME = 71.5k

Ω (12.5mV/µs nominal)

-10

+10

RTIME = 35.7k

Ω (25mV/µs nominal) to 178kΩ

(5mV/µs nominal)

-15

+15

DPRSTP = high, DPRSLPVR = high,

RTIME = 35.7k

Ω to 178kΩ, SR = 6.25mV/µs

nominal to 1.25mV/µs nominal

-20

+20

TIME Slew-Rate Accuracy

Startup and shutdown, RTIME = 35.7k

Ω

(3.125mV/µs nominal) to 178k

Ω

(0.625mV/µs nominal)

-20

+20

BIAS AND REFERENCE

Quiescent Supply Current (VCC)

ICC

Measured at VCC, FB forced above the

regulation point, DPRSLPVR = VCC

510

Quiescent Supply Current (VDD)

IDD

Measured at VDD, FB forced above the

regulation point, DPRSLPVR = VCC

0.01

µA

Shutdown Supply Current (VCC)

ICC(SHDN)

Measured at VCC, SHDN = GND

0.01

µA

Shutdown Supply Current (VDD)

IDD(SHDN)

Measured at VDD, SHDN = GND

0.01

µA

Reference Voltage

VREF

VCC = 4.5V to 5.5V, IREF = 0

1.986

2.000

2.014

IREF = 0 to 500µA

-2

-0.2

Reference Load Regulation

∆VREF

IREF = -100µA to 0

0.21

6.2

FAULT PROTECTION

Measured at FB with respect to unloaded

output voltage; rising edge;

PWM mode or skip mode after output reaches

the regulation voltage

250

300

350

Skip mode and output

have not reached the

regulation voltage

1.75

1.80

1.85

Output Overvoltage Protection

Threshold

(MAX8770/MAX8771 Only)

VOVP

Measured at FB;

rising edge

Minimum OVP threshold

0.8

Output Overvoltage-

Propagation Delay

(MAX8770/MAX8771 Only)

tOVP

FB forced 25mV above trip threshold

µs

Output Undervoltage

Protection Threshold

VUVP

Measured at FB with respect to unloaded

output voltage

-450

-400

-350

Output Undervoltage

Propagation Delay

tUVP

FB forced 25mV below trip threshold

µs

CLKEN Startup Delay

(Boot Time Period)

tBOOT

Measured from the time when FB reaches the

boot target voltage based on the slew rate set

by RTIME

100

µs

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