HIP6302.PDF

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HIP6302
Data Sheet
February 2000
File Number
4766
Microprocessor CORE Voltage Regulator
Multi-Phase Buck PWM Controller
The HIP6302 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 phase converter configurations previously
employed to satisfy the ever increasing current demands of
modern microprocessors. Multi-phase convertors, 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 two phase convertor operating at 350kHz will
have a ripple frequency of 700kHz. Moreover, greater
convertor 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 1.100V to 1.850V 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
• 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
- 5-Bit VID Input
- 1.100V to 1.850V in 25mV Steps
- Programmable “Droop” Voltage
• Fast Transient Recovery Time
• Over Current Protection
• High Ripple Frequency, (Channel Frequency) Times
Number Channels . . . . . . . . . . . . . . . . . 100kHz to 3MHz
Ordering Information
PART NUMBER
HIP6302CB
HIP6302CB-T
HIP6302EVAL1
TEMP. (
o
C)
0 to 70
PACKAGE
16 Ld SOIC
PKG. NO.
M16.15
16 Ld SOIC Tape and Reel
Evaluation Platform
Pinout
HIP6302 (SOIC)
TOP VIEW
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
FS/DIS 8
16 V
CC
15 PGOOD
14 ISEN1
13 PWM1
12 PWM2
11 ISEN2
10 VSEN
9 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Copyright
©
Intersil Corporation 2000
HIP6302
Block Diagram
PGOOD
V
CC
POWER-ON
RESET (POR)
VSEN
+
UV
X 0.9
THREE
STATE
OV
LATCH
S
+
OVP
X1.15
CLOCK AND
SAWTOOTH
GENERATOR
FS/EN
-
-
+
SOFT-
START
AND FAULT
LOGIC
∑
-
+
PWM
PWM1
-
COMP
VID0
VID1
VID2
VID3
VID4
D/A
+
E/A
+
∑
-
+
PWM
PWM2
-
-
FB
CURRENT
CORRECTION
I_TOT
+
OC
∑
I_TRIP
+
ISEN1
ISEN2
+
-
GND
2
HIP6302
Simplified Power System Diagram
VSEN
PWM 1
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
HIP6302
PWM 2
SYNCHRONOUS
RECTIFIED BUCK
CHANNEL
MICROPROCESSOR
VID
Functional Pin Description
VID4 1
VID3 2
VID2 3
VID1 4
VID0 5
COMP 6
FB 7
FS/DIS 8
16 V
CC
15 PGOOD
14 ISEN1
13 PWM1
12 PWM2
11 ISEN2
10 VSEN
9 GND
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.
ISEN2(Pin 11) and ISEN1(Pin 14)
Current sense inputs from the individual converter channel’s
phase nodes.
PWM2 (Pin 12) and PWM1(Pin 13)
VID4 (Pin 1), VID3(Pin 2), VID2 (Pin 3), VID1(Pin 4)
and VID0 (Pin 5)
Voltage Identification inputs from microprocessor. These pins
respond to TTL and 3.3V logic signals. The HIP6302 decodes
VID bits to establish the output voltage. See Table 1.
PWM outputs for each driven channel in use. Connect these
pins to the PWM input of a HIP6601/2/3 driver.
PGOOD (Pin 15)
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.
COMP (Pin 6)
Output of the internal error amplifier. Connect this pin to the
external feedback and compensation network.
V
CC
(Pin 16)
Bias supply. Connect this pin to a 5V supply.
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.
3
HIP6302
Typical Application - Two Phase Converter Using HIP6601 Gate Drivers
+12V
BOOT
PVCC
UGATE
VCC
PHASE
V
IN
= +5V
+5V
PWM
DRIVER
HIP6601
LGATE
GND
FB
VSEN
PGOOD
COMP
V
CC
PWM2
ISEN2
+V
CORE
+12V
BOOT
PVCC
UGATE
VCC
PHASE
V
IN
= +5V
VID4
VID3
VID2
VID1
VID0
FS/DIS
PWM1
PWM
MAIN
CONTROL
HIP6302
DRIVER
HIP6601
LGATE
GND
GND
ISEN1
4
HIP6302
Typical Application - Two Phase Converter Using a HIP6602 Gate Driver
+5V
+12V
BOOT1
V
IN
= +12V
FB
VSEN
COMP
VCC
V
CC
ISEN1
UGATE1
PHASE1
L
01
PGOOD
VID4
VID3
VID2
VID1
VID0
PWM1
PWM1
LGATE1
MAIN
CONTROL
HIP6302
DUAL
DRIVER
HIP6602
PVCC
+V
CORE
+5V
V
IN
+12V
BOOT2
PWM2
ISEN2
PWM2
UGATE2
PHASE2
L
02
FS/DIS
GND
GND
LGATE2
5

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