ISL6277

FN8270 Rev 1.00

Page 7 of 37

Mar 8, 2012

Pin Configuration

ISL6277

(48 LD QFN)

TOP VIEW

1

48

GND PAD

(BOTTOM)

2

3

ISEN2_NB

4

IMON_NB

5

6

SVC

7

PWROK

8

SVD

9

VDDIO

10

SVT

11

VR_HOT_L

12

IMON

47 46 45 44 43 42 41 40

NTC_NB

39 38 37

BOOTX

36

VIN

35

34 BOOT2

33 UGATE2

32 PHASE2

31 LGATE2

30 VDDP

29 VDD

28 PWM_Y

27 LGATE1

26 PHASE1

25 UGATE1

NTC

ENABLE

Pin Descriptions

PIN NUMBER

SYMBOL

DESCRIPTION

1

ISEN2_NB

Individual current sensing for Channel 2 of the Northbridge VR. When ISEN2_NB is pulled to +5V, the

controller will disable Channel 2 and the Northbridge VR will run single-phase.

2

NTC_NB

Thermistor input to VR_HOT_L circuit to monitor Northbridge VR temperature.

3

IMON_NB

Northbridge output current monitor. A current proportional to the Northbridge VR output current is

sourced from this pin.

4SVC

Serial VID clock input from the CPU processor master device.

5

VR_HOT_L

Thermal indicator signal to AMD CPU. Thermal overload open drain output indicator active LOW.

6

SVD

Serial VID data bi-directional signal from the CPU processor master device to the VR.

7

VDDIO

VDDIO is the processor memory interface power rail and this pin serves as the reference to the controller

IC for this processor I/O signal level.

8

SVT

Serial VID Telemetry (SVT) data line input to the CPU from the controller IC. Telemetry and VID-on-the-fly

complete signal provided from this pin.

9

ENABLE

Enable input. A high level logic on this pin enables both VRs.

10

PWROK

running. While this pin is low, the SVC and SVD input states determine the pre-PWROK metal VID. This

pin must be low prior to the ISL6277 PGOOD output going high per the AMD SVI 2.0 Controller Guidelines.

11

IMON

Core output current monitor. A current proportional to the Core VR output current is sourced from this pin.

12

NTC

Thermistor input to VR_HOT_L circuit to monitor Core VR temperature.

13

ISEN3

ISEN3 is the individual current sensing for Channel 3. When ISEN3 is pulled to +5V, the controller disables

Channel 3, and the Core VR runs in two-phase mode.

14

ISEN2

Individual current sensing for Channel 2 of the Core VR. When ISEN2 is pulled to +5V, the controller

disables Channel 2, and the Core VR runs in single-phase mode.