1
File Number
4767
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Copyright
Intersil Corporation 1999
AthlonTM is a trademark of Advanced Micro Devices, Inc.
HIP6303
Microprocessor CORE Voltage Regulator
Multi-Phase Buck PWM Controller
The HIP6303 multi-phase PWM control IC together with its
companion gate drivers, the HIP6601, HIP6602 or HIP6603
and Intersil MOSFETs provides a precision voltage
regulation system for advanced microprocessors.
Multiphase power conversion is a marked departure from
earlier single channel converter configurations previously
employed to satisfy the ever increasing current demands of
modern microprocessors. Multi-phase converters, by
distributing the power and load current results in smaller and
lower cost transistors with fewer input and output capacitors.
These reductions accrue from the higher effective
conversion frequency with higher frequency ripple current
due to the phase interleaving process of this topology. For
example, a three channel converter operating at 350kHz will
have a ripple frequency of 1.05MHz. Moreover, greater
converter bandwidth of this design results in faster response
to load transients.
Outstanding features of this controller IC include
programmable VID codes from the microprocessor that
range from 1.30V to 2.05V with a system accuracy of
1%.
Pull up currents on these VID pins eliminates the need for
external pull up resistors. In addition "droop" compensation,
used to reduce the overshoot or undershoot of the CORE
voltage, is easily programmed with a single resistor.
Another feature of this controller IC is the PGOOD monitor
circuit which is held low until the CORE voltage increases,
during its Soft-Start sequence, to within 10% of the
programmed voltage. Over-voltage, 15% above programmed
CORE voltage, results in the converter shutting down and
turning the lower MOSFETs ON to clamp and protect the
microprocessor. Under voltage is also detected and results
in PGOOD low if the CORE voltage falls 10% below the
programmed level. Over-current protection reduces the
regulator current to less than 25% of the programmed trip
value. These features provide monitoring and protection for
the microprocessor and power system.
Features
AMD Athlon
Compatible
Multi-Phase Power Conversion
Precision Channel Current Sharing
- Loss Less Current Sampling - Uses r
DS(ON)
Precision CORE Voltage Regulation
-
1% System Accuracy Over Temperature
Microprocessor Voltage Identification Input
- 4-Bit VID Input
- 1.30V to 2.05V in 50mV Steps
- Programmable "Droop" Voltage
Fast Transient Recovery Time
Over Current Protection
Automatic Selection of 2, 3, or 4 Channel Operation
High Ripple Frequency, (Channel Frequency) Times
Number of Channels . . . . . . . . . . . . . . . 100kHz to 6MHz
Pinout
HIP6303 (SOIC)
TOP VIEW
Ordering Information
PART NUMBER
TEMP. (
o
C)
PACKAGE
PKG. NO.
HIP6303CB
0 to 70
20 Ld SOIC
M20.3
HIP6303CB-T
20 Ld SOIC Tape and Reel
HIP6303EVAL1
Evaluation Platform
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
VID3
VID2
VID1
VID0
EN
FS/DIS
PWM2
PGOOD
PWM3
ISEN4
ISEN1
V
CC
GND
ISEN3
FB
PWM4
VSEN
COMP
PWM1
ISEN2
Data Sheet
December 1999
3
Simplified Power System Diagram
Functional Pin Description
VID3 (Pin 1), VID2 (Pin 2), VID1 (Pin 3) and VID0
(Pin 4)
Voltage Identification inputs from microprocessor. These pins
respond to TTL and 3.3V logic signals. The HIP6303 decodes
VID bits to establish the output voltage. See Table 1.
EN (Pin 5)
Enable pin normal operation is with input open or high. A low
input disables the regulator and three states the PWM
outputs.
COMP (Pin 6)
Output of the internal error amplifier. Connect this pin to the
external feedback and compensation network.
FB (Pin 7)
Inverting input of the internal error amplifier.
FS/DIS (Pin 8)
Channel frequency, F
SW
, select and disable. A resistor from
this pin to ground sets the switching frequency of the
converter. Pulling this pin to ground disables the converter
and three states the PWM outputs. See Figure 10.
GND (Pin 9)
Bias and reference ground. All signals are referenced to this
pin.
VSEN (Pin 10)
Power good monitor input. Connect to the microprocessor-
CORE voltage.
PWM1 (Pin 15), PWM2 (Pin 14), PWM3 (Pin 11) and
PWM4 (Pin 18)
PWM outputs for each driven channel in use. Connect these
pins to the PWM input of a HIP6601/2/3 driver. For systems
which use 3 channels, connect PWM4 high. Two channel
systems connect PWM3 and PWM4 high.
ISEN1 (Pin 16), ISEN2 (Pin 13), ISEN3 (Pin 12) and
ISEN4 (Pin 17)
Current sense inputs from the individual converter channel's
phase nodes. Unused sense lines MUST be left open.
PGOOD (Pin 19)
Power good. This pin provides a logic-high signal when the
microprocessor-CORE voltage (VSEN pin) is within
specified limits and Soft-Start has timed out.
V
CC
(Pin 20)
Bias supply. Connect this pin to a 5V supply.
SYNCHRONOUS
HIP6303
MICROPROCESSOR
VSEN
VID
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
PWM 1
PWM 2
PWM 3
PWM 4
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
VID3
VID2
VID1
VID0
EN
FS/DIS
PWM2
PGOOD
PWM3
ISEN4
ISEN1
V
CC
GND
ISEN3
FB
PWM4
VSEN
COMP
PWM1
ISEN2
HIP6303
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