ISL6552CB Intersil, ISL6552CB Datasheet

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ISL6552CB

Manufacturer Part Number
ISL6552CB
Description
IC PWM CORE VOLTAGE REG 20-SOIC
Manufacturer
Intersil
Datasheet

Specifications of ISL6552CB

Pwm Type
Controller
Number Of Outputs
1
Frequency - Max
1.5MHz
Voltage - Supply
4.75 V ~ 5.25 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
20-SOIC (7.5mm Width)
Frequency-max
1.5MHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Duty Cycle
-

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20 000
Microprocessor CORE Voltage Regulator
Multi-Phase Buck PWM Controller
The ISL6552 multi-phase PWM control IC together with its
companion gate drivers, the HIP6601, HIP6602 or HIP6603
and external Intersil MOSFETs provides a precision voltage
regulation system for advanced microprocessors.
Multi-phase 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 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 phase 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 1.05V to 1.825V 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 RMS output current to 41% of the programmed
over-current trip value. These features provide monitoring
and protection for the microprocessor and power system.
®
1
Data Sheet
1-888-INTERSIL or 321-724-7143
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Multi-Phase Power Conversion
• Precision Channel Current Sharing
• Precision CORE Voltage Regulation
• Microprocessor Voltage Identification Input
• Fast Transient Recovery Time
• Over Current Protection
• Automatic Selection of 2, 3, or 4 Phase Operation
• High Ripple Frequency (Channel Frequency) Times
• QFN Package:
• Pb-free available
Ordering Information
ISL6552CB
ISL6552CBZ
(See Note)
ISL6552CR
ISL6552CRZ
(See Note)
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
PART NUMBER
- Loss Less Current Sampling - Uses r
- ±1% System Accuracy Over Temperature
- 5-Bit VID Input
- 1.05V to 1.825V in 25mV Steps
- Programmable “Droop” Voltage
Number Channels . . . . . . . . . . . . . . . . . .100kHz to 6MHz
- Compliant to JEDEC PUB95 MO-220
- Near Chip Scale Package footprint, which improves
QFN - Quad Flat No Leads - Package Outline
PCB efficiency and has a thinner profile
All other trademarks mentioned are the property of their respective owners.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003, 2004. All Rights Reserved.
July 2004
TEMP. (
0 to 70
0 to 70
0 to 70
0 to 70
o
C)
20 Ld SOIC
20 Ld SOIC
(Pb-free)
20 Ld 5x5 QFN L20.5x5
20 Ld 5x5 QFN
(Pb-free)
PACKAGE
DS(ON)
ISL6552
M20.3
M20.3
L20.5x5
PKG. DWG. #
FN4918.2

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ISL6552CB Summary of contents

Page 1

... QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile • Pb-free available Ordering Information PART NUMBER TEMP. ( ISL6552CB ISL6552CBZ (See Note) ISL6552CR ISL6552CRZ (See Note) *Add “-T” suffix to part number for tape and reel packaging. ...

Page 2

... Pinouts ISL6552CB (20 LEAD SOIC TOP VIEW 1 VID3 2 VID2 3 VID1 4 VID0 5 VID25mV 6 COMP FS/DIS 9 GND 10 VSEN 2 ISL6552 20 VCC 19 PGOOD 18 PWM4 17 ISEN4 16 ISEN1 15 PWM1 14 PWM2 13 ISEN2 12 ISEN3 11 PWM3 ISL6552CR (20 LEAD 5x5 QFN) TOP VIEW VID1 1 15 VID0 VID25mV GND COMP ISEN4 ISEN1 PWM1 ...

Page 3

Block Diagram VSEN X 0.9 X1.15 COMP VID3 VID2 VID1 D/A VID0 VID25mV FB 3 ISL6552 PGOOD VCC POWER-ON RESET (POR LATCH CLOCK AND S SAWTOOTH GENERATOR OVP + + ∑ SOFT- + ∑ ...

Page 4

... Simplified Power System Diagram VSEN PWM 1 PWM 2 ISL6552 PWM 3 PWM 4 VID Functional Pin Description ISL6552CB (20 LEAD SOIC) 1 VID3 2 VID2 3 VID1 4 VID0 5 VID25mV 6 COMP FS/DIS 9 GND 10 VSEN ISL6552CR (20 LEAD 5x5 QFN VID1 1 VID0 2 3 VID25mV GND COMP ISL6552 SYNCHRONOUS RECTIFIED BUCK CHANNEL ...

Page 5

ISEN1, ISEN2, ISEN3 and ISEN4 Current sense inputs from the individual converter channel’s phase nodes. Unused sense lines MUST be left open. Typical Application - 2 Phase Converter Using HIP6601 Gate Drivers +5V FB COMP VCC VSEN PWM4 PWM3 PGOOD ...

Page 6

Typical Application - 4 Phase Converter Using HIP6602 Gate Drivers FB COMP VCC VSEN ISEN1 PWM1 PGOOD VID3 PWM2 ISEN2 VID2 MAIN VID1 CONTROL ISL6552 VID0 VID25mV ISEN3 FS/DIS PWM3 PWM4 ISEN4 GND 6 ISL6552 +12V BOOT1 UGATE1 VCC PHASE1 ...

Page 7

Absolute Maximum Ratings Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+7V ...

Page 8

ERROR AMPLIFIER CORRECTION - ∑ PROGRAMMABLE REFERENCE + DAC ∑ AVERAGE - + ∑ ∑ CORRECTION FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6552 VOLTAGE AND CURRENT CONTROL LOOPS FOR ...

Page 9

Droop Compensation In addition to control of each power channel’s output current, the average channel current is also used to provide CORE voltage “droop” compensation. Average full channel ...

Page 10

Figure 3 shows the start-up sequence as initiated by a fast rising 5V supply, VCC applied to the ISL6552. Note the , short rise to the three state level in PWM 1 output during first 32 PWM cycles. Figure 4 ...

Page 11

If the conditions that caused the over-voltage still persist, the PWM outputs will be cycled between three state and V clamped to ground hysteretic shunt regulator. Under-Voltage The VSEN pin ...

Page 12

COMP FB SAWTOOTH ERROR GENERATOR AMPLIFIER CORRECTION + - + - DIFFERENCE REFERENCE DAC TO OTHER CHANNELS TO OVER + CURRENT - TRIP COMPARATOR FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE ...

Page 13

This droop compensation allows larger transient voltage deviations and thus reduces the size and cost of the output filter components. R should be selected to give the desired “droop” voltage at IN the normal full ...

Page 14

... Careful component selection, tight layout of the critical components, and short, wide circuit traces minimize the magnitude of voltage spikes. Contact Intersil for evaluation board drawings of the component placement and printed circuit board. There are two sets of critical components in a DC-DC converter using a ISL6552 controller and a HIP6601 gate driver ...

Page 15

ESR (effective series resistance) and voltage rating requirements rather than actual capacitance requirements. High frequency decoupling capacitors should be placed as close to the power pins of the load as physically possible. Be careful not to add inductance in ...

Page 16

... The diode's rated reverse breakdown voltage must be greater than the maximum input voltage. References Intersil documents are available on the web at www.intersil.com/ [1] HIP6601/HIP6603 Data Sheet, Intersil Corporation, File No. 4819 [2] HIP6602 Data Sheet, Intersil Corporation, File No. 4838 2 × × × × I ...

Page 17

Small Outline Plastic Packages (SOIC) N INDEX 0.25(0.010) H AREA E - SEATING PLANE - -C- α µ 0.10(0.004) 0.25(0.010 NOTES: 1. Symbols are defined in ...

Page 18

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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