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ISL6557A

Multiphase PWM Controller for CORE Voltage Regulation

Renesas Electronics 

ISL6557A

Electrical Specifications Operating Conditions: VCC = 5V, TA = 0oC to 70oC, Unless Otherwise Specified. (Continued)

PARAMETER

TEST CONDITIONS

MIN TYP MAX

ISEN

Overcurrent Trip Level

PROTECTION and MONITOR

-90 -75 -60

Overvoltage Threshold

VSEN Rising

2.04 2.09 2.13

VSEN Falling

VID

Undervoltage Threshold

VSEN Rising

92

VSEN Falling

90

PGOOD Low Voltage

IPGOOD = 4mA

0.18 0.4

UNITS

A

V

V

%VID

%VID

mV

NOTES:

2. These parts are designed and adjusted for accuracy within the system tolerance given in the Electrical Specifications. The system tolerance

accounts for offsets in the differential and error amplifiers; reference-voltage inaccuracies; temperature drift; and the full DAC adjustment range.

3. VID input levels above 2.9V may produce an reference-voltage offset inaccuracy.

Functional Pin Descriptions

VID4 1

VID3 2

VID2 3

VID1 4

VID0 5

COMP 6

FB 7

IOUT 8

VDIFF 9

VSEN 10

RGND 11

GND 12

24 VCC

23 EN

22 FS

21 PGOOD

20 PWM4

19 ISEN4

18 ISEN1

17 PWM1

16 PWM2

15 ISEN2

14 ISEN3

13 PWM3

VID4, VID3, VID2, VID1, VID0 (Pins 1, 2, 3, 4, 5)

These are the inputs to the internal DAC that provides the

reference voltage for output regulation. Connect these pins to

either open-drain or active-pull-up type outputs. Pulling these

pins above 2.9V can cause a reference offset inaccuracy.

FB (Pin 7) and COMP (Pin 6)

The internal error amplifier’s inverting input and output

respectively. These pins are connected to an external R-C

network to compensate the regulator.

IOUT (Pin 8)

The current out of this pin is proportional to output current and

is used for load-line regulation and load sharing. The scale

factor is set by the ratio of the ISEN resistors (connected to

pins 14, 15, 18, and 19) to the lower MOSFET rDS(ON).

VDIFF (Pin 9), VSEN (Pin 10), RGND (Pin 11)

VSEN and RGND are the inputs to the differential remote-

sense amplifier. VDIFF is the output and it serves as the input

to the external regulation circuitry and the internal protection

circuitry. Connect VSEN and RGND to the sense pins of the

remote load.

GND (Pin 12)

Return for VCC and signal ground for the IC.

PWM3, PWM2, PWM1, PWM4 (Pins 13, 16, 17, 20)

Pulse-width modulation outputs. These logic outputs tell the

driver IC(s) when to turn the MOSFETs on and off.

ISEN3, ISEN2, ISEN1, ISEN4 (PINS 14, 15, 18, 19)

Current sense inputs. A resistor connected between these pins

and the respective phase nodes has a current proportional to

the current in the lower MOSFET during its conduction interval.

The current is used as a reference for channel balancing, load

sharing, protection, and load-line regulation.

PGOOD (Pin 21)

PGOOD is an open-drain logic output that changes to a logic

low when the differential output voltage at VDIFF swings below

90% of the DAC setting or above 2.1V.

FS (Pin 22)

This pin has two functions. A resistor placed from FS to ground

sets the switching frequency. There is an inverse relationship

between the value of the resistor and the switching frequency.

This pin can also be used to disable the controller. To disable

the controller, pull this pin below 1V.

EN (Pin 23)

This is the threshold-sensitive enable input for the controller.

To enable the controller, pull this pin above 1.23V.

VCC (Pin 24)

Bias supply voltage for the controller. Connect this pin to a 5V

power supply.

FN9068 Rev 3.00

July 2004

Page 5 of 18

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