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PDF HIP6302 Data sheet ( Hoja de datos )
| Número de pieza | HIP6302 | |
| Descripción | Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HIP6302
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 rDS(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 TEMP. (oC) PACKAGE PKG. NO.
HIP6302CB
0 to 70 16 Ld SOIC M16.15
HIP6302CB-T
HIP6302EVAL1
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 VCC
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
1 page  
HIP6302
Typical Application - Two Phase Converter Using a HIP6602 Gate Driver
+5V
PGOOD
VID4
VID3
VID2
VID1
VID0
FB
VSEN
COMP
VCC
ISEN1
PWM1
MAIN
CONTROL
HIP6302
FS/DIS
PWM2
ISEN2
GND
+12V
VCC
BOOT1 VIN = +12V
UGATE1
PHASE1
PWM1
LGATE1
DUAL
DRIVER
HIP6602
PVCC
+5V
BOOT2
VIN +12V
PWM2
UGATE2
PHASE2
LGATE2
GND
L01
L02
+VCORE
5
5 Page 
HIP6302
RIN
RFB Cc
FB COMP
HIP6302
ERROR
AMPLIFIER
-
+
SAWTOOTH
GENERATOR
CORRECTION
+
-
COMPARATOR
- PWM
+ CIRCUIT
REFERENCE
DAC
TO OTHER
CHANNELS
DIFFERENCE
+
-
AVERAGING
CURRENT
SENSING
CURRENT
SENSING
FROM
OTHER
CHANNEL
TO OVER
CURRENT
TRIP
+
-
COMPARATOR
REFERENCE
PWM
ISEN
VIN
Q1 L01
HIP6601
Q2
IL
PHASE
RISEN
ONLY ONE OUTPUT
STAGE SHOWN
INDUCTOR
CURRENT
FROM
OTHER
CHANNEL
VCORE
FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING
Current Sensing and Balancing
Overview
The HIP6302 samples the on-state voltage drop across each
synchronous rectifier FET, Q2, as an indication of the
inductor current in that phase, see Figure 7. Neglecting AC
effects (to be discussed later), the voltage drop across Q2 is
simply rDS(ON)(Q2) x inductor current (IL). Note that IL, the
inductor current, is 1/2 of the total current (ILT).
The voltage at Q2’s drain, the PHASE node, is applied to the
RISEN resistor to develop the IISEN current to the HIP6302
ISEN pin. This pin is held at virtual ground, so the current
through RISEN is IL x rDS(ON)(Q2) / RISEN.
The IISEN current provides information to perform the
following functions:
1. Detection of an over-current condition
2. Reduce the regulator output voltage with increasing load
current (droop)
3. Balance the IL currents in the two phases
Over-Current, Selecting RISEN
The current detected through the RISEN resistor is averaged
with the current detected in the other channel. The averaged
current is compared with a trimmed, internally generated
current, and used to detect an over-current condition.
The nominal current through the RISEN resistor should be
50µA at full output load current, and the nominal trip point for
over-current detection is 165% of that value, or 82.5µA.
Therefore, RISEN = IL x rDS(ON) (Q2) / 50µA.
For a full load of 25A per phase, and an rDS(ON) (Q2) of
4mΩ, RISEN = 2kΩ .
The over-current trip point would be 165% of 25A, or ~ 41A
per phase. The RISEN value can be adjusted to change the
over-current trip point, but it is suggested to stay within ±25%
of nominal.
Droop, Selection of RIN
The average of the currents detected through the RISEN
resistors is also steered to the FB pin. There is no DC return
path connected to the FB pin except for RIN, so the average
current creates a voltage drop across RIN. This drop
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HIP6302.PDF ] | |
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