MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-

PWM Controller for IMVP-6+ CPU Core Power Supplies

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

D0–D6, CSP_ to GND...............................................-0.3V to +6V

CSN12 (MAX8771) to GND ......................................-0.3V to +6V

CSN_ (MAX8770/MAX8772) to GND........................-0.3V to +6V

PHASEGD (MAX8771) to GND.................................-0.3V to +6V

THRM, VRHOT, CLKEN to GND...............................-0.3V to +6V

SHDN to GND (Note 1)...........................................-0.3V to +14V

TON to GND ...........................................................-0.3V to +30V

DPRSLPVR, DPRSTP, PSI to GND ...........................-0.3V to +6V

GNDS, PGND_ to GND .........................................-0.3V to +0.3V

BST_ to GND ..........................................................-0.3V to +36V

LX_ to BST_ ..............................................................-6V to +0.3V

BST_ to VDD...........................................................-0.3V to +30V

REF Short Circuit to GND ...........................................Continuous

Continuous Power Dissipation

40-Pin 6mm x 6mm Thin QFN

(derate 23.2mW/°C above +70°C) .............................2051mW

Operating Temperature Range .........................-40°C to +105°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +165°C

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: SHDN may be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables

fault protection and disables overlapping operation.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

PWM CONTROLLER

Input Voltage Range

4.5

5.5

V

DAC codes from

0.8375V to 1.500V

-0.4

+0.4

%

DAC codes from

0.500V to 0.825V

-4

+4

DC Output-Voltage Accuracy

Includes load-

regulation error

(Note 2)

DAC codes below

0.4875V

-10

+10

mV

Boot Voltage

1.19

1.20

1.21

V

GNDS Input Range

-200

+200

mV

GNDS Gain

0.95

1.00

1.05

V/V

GNDS Input Bias Current

-25

-15

+2

µA

FB Input Bias Current

CSP_ = CSN_ for both enabled phases

-2

+2

µA

Ω

142

167

192

Ω

300

333

366

On-Time Accuracy (Note 3)

Ω

425

500

575

ns

TON Shutdown Input Current

0.01

0.1

µA

Minimum FB and CCI Voltages

for Pseudo-Fixed-Frequency

Operation

Switching frequency is reduced if FB and/or

CCI are less than this value

0.2

0.25

V

Minimum Off-Time

(Note 3)

300

375

ns