Multipurpose Two-Phase Buck PWM Controller with
Integrated MOSFET Drivers
ISL6567
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
±0.6%,
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 is an internal shunt regulator with optional external
connection capability which 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
r
DS(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 r
DS(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 (RoHS Compliant)
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL6567CRZ
ISL6567IRZ
PART
MARKING
65 67CRZ
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
0 to +70 24 Ld 4x4 QFN L24.4x4C
65 67IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4C
NOTE:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details
on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special
Pb-free material sets, molding compounds/die attach materials,
and 100% matte tin plate plus anneal (e3 termination finish, which
is 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.
3. For Moisture Sensitivity Level (MSL), please see device information
page for
ISL6567.
For more information on MSL please see
techbrief
TB363.
August 9, 2011
FN9243.4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Copyright Intersil Americas Inc. 2005-2009, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL6567
Absolute Maximum Ratings
Supply Voltage, VCC, PVCC . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
Shunt Regulator Voltage, V
VREG
. . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
Boot Voltage, V
BOOT
. . . . . . . . . . . . . . . . . . . . . PGND - 0.3V to PGND + 27V
PHASE Voltage . . . . . . . . . . . . . . . . . . . . . GND - 0.3V (DC) to VBOOT + 0.3V
. . . . . . . . . . . . . . . . GND - 5V (<100ns Pulse Width, 10µJ) to V
BOOT
+ 0.3V
UGATE Voltage. . . . . . . . . . . . . . . . . . . . V
PHASE
- 0.3V (DC) to V
BOOT
+ 0.3V
. . . . . . . . . . . . . V
PHASE
- 4V (<200ns Pulse Width, 20µJ) to V
BOOT
+ 0.3V
LGATE Voltage . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V (DC) to V
VCC
+ 0.3V
. . . . . . . . . . . . . . . . . . GND - 2V (<100ns Pulse Width, 4µJ) to V
VCC
+ 0.3V
Input, Output, or I/O Voltage . . . . . . . . . . . . . . . . . GND - 0.3V to VCC + 0.3V
Thermal Information
Thermal Resistance
θ
JA
(°C/W)
θ
JC
(°C/W)
QFN Package (Notes 4, 5) . . . . . . . . . . . . . .
43
7
Ambient Operating Temperature Range . . . . . . . . . . . . . . . -40°C to +85°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+4.9V to +5.5V
Ambient Temperature
ISL6567CRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
ISL6567IRZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4.
θ
JA
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.
5. For
θ
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
over the operating temperature range.
PARAMETER
Operating Conditions: V
CC
= 5V, T
J
= -40°C to +85°C, unless otherwise specified. Boldface limits apply
MIN
(Note 8)
MAX
(Note 8)
TEST CONDITIONS
TYP
UNITS
BIAS SUPPLY AND INTERNAL OSCILLATOR
Input Bias Supply Current
Rising VCC POR (Power-On Reset) Threshold
VCC POR Hysteresis
Rising PVCC POR Threshold
Shunt Regulation
Maximum Shunt Current
Switching Frequency (Per Channel; Note 7)
Frequency Tolerance
Oscillator Peak-to-Peak Ramp Amplitude
Maximum Duty Cycle
V
VCC
; I
VREG
= 0mA to 120mA
I
VREG_MAX
F
SW
F
SW
V
OSC
d
MAX
I
VCC
; EN > 0.7V; LGATE, UGATE open
-
4.30
0.46
3.60
4.90
120
200
-10
-
-
7.6
4.40
0.51
3.67
5.10
-
-
-
1.4
66
9
4.50
0.58
3.75
5.35
-
2000
10
-
-
mA
V
V
V
V
mA
kHz
%
V
%
CONTROL THRESHOLDS
EN Threshold
EN Hysteresis Current
MON Power-Good Enable Threshold
MON Hysteresis Current
V
MON_TH
-
-
290
-
0.65
20
305
10
-
-
320
-
V
µA
mV
µA
SOFT-START
SS Current
SS Ramp Amplitude
SS Threshold for Output Gates Turn-Off
I
SS
-
0.55
0.40
22
-
-
-
3.60
-
µA
V
V
5
FN9243.4
August 9, 2011
RF/Wirelessly
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