ISL6567.pdf 데이터시트 (총 26 페이지) - 파일 다운로드 ISL6567 데이타시트 다운로드

No Preview Available !

®
Data Sheet
March 20, 2007
ISL6567
FN9243.2
Multipurpose Two-Phase Buck PWM
Controller with Integrated MOSFET
Drivers
The ISL6567 two-phase synchronous buck PWM control IC
provides a precision voltage regulation system for point-of-
load and other high-current applications requiring an efficient
and compact implementation. Multi-phase power conversion
is a marked departure from single phase converter
configurations employed to satisfy the increasing current
demands of various electronic circuits. By distributing the
power and load current, implementation of multi-phase
converters utilize 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 resulting from the phase
interleaving inherent to this topology.
Outstanding features of this controller IC include an internal
0.6V reference with a system regulation accuracy of ±1%, an
optional external reference input, and user-adjustable
switching frequency. Precision regulation is further
enhanced by the available unity-gain differential amplifier
targeted at remote voltage sensing capability, while output
regulation is monitored and its quality is reported via a
PGOOD pin. Also included, an internal shunt regulator with
optional external connection capability extends the
operational input voltage range. For applications requiring
voltage tracking or sequencing, the ISL6567 offers a host of
possibilities, including coincidental, ratiometric, or offset
tracking, as well as sequential start-ups, user adjustable for
a wide range of applications.
Protection features of this controller IC include overvoltage
and overcurrent protection. Overvoltage results in the
converter turning the lower MOSFETs ON to clamp the rising
output voltage. The ISL6567 uses cost and space-saving
rDS(ON) sensing for channel current balance, dynamic
voltage positioning, and overcurrent protection. Channel
current balancing is automatic and accurate with the
integrated current-balance control system. Overcurrent
protection can be tailored to various application with no need
for additional parts.
Features
• Integrated Two-Phase Power Conversion
- Integrated 4A Drivers for High Efficiency
• Shunt Regulator for Wide Input Power Conversion
- 5V and Higher Bias
- Up to 20V Power Down-Conversion
• Precision Channel Current Sharing
- Loss-Less Current Sampling - Uses rDS(ON)
• Precision Output Voltage Regulation
- ±0.6% System Accuracy Over Temperature
(Commercial Range)
• 0.6V Internal Reference
• Full Spectrum Voltage Tracking
- Coincidental, Ratiometric, or Offset
• Sequential Start-up Control
• Adjustable Switching Frequency
- 150kHz to 1.5MHz
• Fast Transient Recovery Time
• Unity-Gain Differential Amplifier
- Increased Voltage Sensing Accuracy
• Overcurrent Protection
• Overvoltage Protection
• Start-up into Pre-Charged Output
• Small, QFN Package Footprint
• Pb-Free Plus Anneal Available (RoHS Compliant)
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005-2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

No Preview Available !

ISL6567
Ordering Information
PART
NUMBER
(Note)
PART TEMP.
MARKING (°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6567CRZ 6567CRZ 0 to +70 24 Ld 4x4 QFN L24.4x4C
ISL6567CRZ-T 6567CRZ 0 to +70 24 Ld 4x4 QFN L24.4x4C
ISL6567IRZ 6567IRZ
ISL6567IRZ-T 6567IRZ
-40 to +85 24 Ld 4x4 QFN L24.4x4C
-40 to +85 24 Ld 4x4 QFN L24.4x4C
ISL6567EVAL1 Evaluation Platform
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
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-020.
Pinout
ISL6567 (QFN)
TOP VIEW
24 23 22 21 20 19
RGND 1
18 PHASE1
VSEN 2
17 ISEN1
MON 3
VDIFF 4
25
GND
16 LGATE1
15 PVCC
FB 5
14 LGATE2
COMP 6
13 ISEN2
7 8 9 10 11 12
2 FN9243.2
March 20, 2007

No Preview Available !

Block Diagram
PGOOD
FS EN
VCC
PVCC
MON
300mV +
-
110%
90%
10μA
VCC
10μA
COMP
OVP
120%
REFTRK
FB
VDIFF
RGND
VSEN
VREG
REFERENCE
EA
+
-
OC
X1
VCC
SHUNT LINEAR
REGULATOR
20μA
OSCILLATOR
POWER-ON
RESET (POR)
GATE
CONTROL
SOFT-START
AND
FAULT LOGIC
Σ
Σ
CURRENT
CORRECTION
PWM1
PWM2
VCC
20μA
CONTROL
LOGIC
GATE
CONTROL
20μA/1mA
ISEN1 ISEN2
SS
BOOT1
UGATE1
PHASE1
LGATE1
GND
BOOT2
UGATE2
PHASE2
LGATE2

No Preview Available !

Simplified Power System Diagram
VIN
EN
PGOOD
ISL6567
CHANNEL1
Q1
Q2
ISL6567
CHANNEL2
Q3
Q4
VOUT
Typical Application
VIN
RSHUNT
CF1
REFTRK
FS
RFS
SS
CSS
MON
RPG
PGOOD
R4
EN
R5
CF2
VCC VREG PVCC
ISL6567
LIN
CHFIN1
CBIN1
BOOT1
CBOOT1
UGATE1
PHASE1
Q1
ISEN1
RISEN1
LGATE1
Q2
LOUT1
BOOT2
UGATE2
PHASE2
CBOOT2
CHFIN2
Q3
CBIN2
C1
R2
COMP
C2
FB
R1
ISEN2
RISEN2
LGATE2
GND
VDIFF VSEN RGND
Q4
LOUT2
4
CHFOUT
VOUT
CBOUT
RS
RP
FN9243.2
March 20, 2007

No Preview Available !

ISL6567
Absolute Maximum Ratings
Supply Voltage, VCC, PVCC . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
Shunt Regulator Voltage, VVREG . . . . . . . . . . . . . . . -0.3V to +6.5V
Boot Voltage, VBOOT . . . . . . . . . . . . . PGND - 0.3V to PGND + 27V
Phase Voltage, VPHASE . . . . . . . . . . VBOOT - 7V to VBOOT + 0.3V
Upper Gate Voltage, VUGATE . . . . VPHASE - 0.3V to VBOOT + 0.3V
Lower Gate Voltage, VLGATE. . . . . . . . PGND - 0.3V to VCC + 0.3V
Input, Output, or I/O Voltage . . . . . . . . . GND - 0.3V to VCC + 0.3V
ESD Classification . . . . . . . . . . . . . . . . . . HBM Class 1 JEDEC STD
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . +4.9V to +5.5V
Ambient Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Thermal Information
Thermal Resistance
θJA (°C/W) θJC (°C/W)
QFN Package (Notes 1, 2). . . . . . . . . .
43
7
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C
CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational section of this specification is not implied.
NOTES:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications Operating Conditions: VCC = 5V, TJ = -40°C to +85°C, Unless Otherwise Specified
PARAMETER
TEST CONDITIONS
MIN TYP
BIAS SUPPLY AND INTERNAL OSCILLATOR
Input Bias Supply Current
Rising VCC POR (Power-On Reset) Threshold
IVCC; EN > 0.7V; LGATE, UGATE open
- 7.6
4.30 4.40
VCC POR Hysteresis
0.46 0.51
Rising PVCC POR Threshold
3.60 3.67
Shunt Regulation
Maximum Shunt Current
Switching Frequency (per channel; Note 4)
Frequency Tolerance
Oscillator Peak-to-Peak Ramp Amplitude
Maximum Duty Cycle
CONTROL THRESHOLDS
VVCC; IVREG = 0 to 120mA
IVREG_MAX
FSW
FSW
VOSC
dMAX
4.90
120
200
-10
-
-
5.10
-
-
-
1.4
66
EN Threshold
- 0.65
EN Hysteresis Current
- 20
MON Power-Good Enable Threshold
MON Hysteresis Current
VMON_TH
290 305
- 10
SOFT-START
SS Current
SS Ramp Amplitude
ISS
- 22
0.55 -
SS Threshold for Output Gates Turn-Off
0.40 -
REFERENCE AND DAC
System Accuracy (Commercial Temp. Range)
-0.6 -
System Accuracy (Industrial Temp. Range)
-0.8 -
Internal Reference
External Reference DC Amplitude Range
External Reference DC Offset Range
VREF
VREFTRK (DC)
VREFTRK (DC) offset
- 0.6
0.1 -
-4.5 -
MAX UNITS
9
4.50
0.58
3.75
5.35
-
2000
10
-
-
mA
V
V
V
V
mA
kHz
%
V
%
-V
- μA
320 mV
- μA
- μA
3.60 V
-V
0.6 %
0.8 %
-V
2.3 V
4.5 mV
5 FN9243.2
March 20, 2007