ISL6328 Datasheet, PDF (5/33 Pages) Intersil Corporation – Dual PWM Controller For Powering AMD SVI Split-Plane Processors

Pin Configuration
ISL6328
ISL6328
(48 LD QFN)
TOP VIEW
48 47 46 45 44 43 42 41 40 39 38 37
COMP_NB ₁
36 ^PWM4
FB_NB ₂
35 ^PWROK
VSEN_NB ₃
34 ^VDDPWRGD
DRPCTRL 4
33 ^PHASE1
SVC 5
32 ^UGATE1
SVD 6
VCC 7
49
GND
31 BOOT1
30 LGATE1
RSVD ⁸
29 GVOT
OFS ⁹
28 LGATE2
OCP ¹⁰
27 BOOT2
TCOMP1 ¹¹
TCOMP2 ¹²
26 UGATE2
25 _EN
13 14 15 16 17 18 19 20 21 22 23 24
Functional Pin Descriptions
PIN NAME
COMP_NB
FB_NB
VSEN_NB
DRPCTRL
SVC
SVD
VCC
RSVD
OFS
PIN NUMBER
1
2
3
4
5
6
7
8
9
DESCRIPTION
Output of the internal error amplifier for the Northbridge regulator.
Inverting input to the internal error amplifier for the Northbridge regulator.
Non-inverting input to the Northbridge regulator precision differential remote-sense amplifier. This pin
should be connected to the remote Northbridge sense pin of the processor, VDDNB_SENSE.
Droop Control for Core and Northbridge. This pin is used to set up one of four user programmable selections
via a resistor: Core Droop On and Northbridge Droop On; Core Droop Off and Northbridge Droop On, Core
Droop On and Northbridge Droop Off; Core Droop Off and Northbridge Droop Off.
If the resistor is tied to ground, the number of active phases in PSI mode is 1. If the resistor is tied to
VCC, the number of active phases in PSI mode is 2.
Serial VID clock input from the AMD processor.
Serial VID data bi-directional signal to and from the master device on AMD processor.
VCC is the bias supply for the ICs small-signal circuitry. Connect this pin to a +5V supply and decouple
using a quality 0.1µF ceramic capacitor.
RESERVED. Connect this pin directly to the VCC pin.
The OFS pin provides a means to program a DC current for generating an offset voltage across the resistor
between FB and VSEN. The offset current is generated via an external resistor and precision internal
voltage references. The polarity of the offset is selected by connecting the resistor to GND or VCC. For no
offset, the OFS pin should be left unconnected.
5
FN7621.1
June 7, 2011