®
ISL6441
Data Sheet
May 26, 2009
FN9197.3
1.4MHz Dual, 180° Out-of-Phase,
Step-Down PWM and Single Linear
Controller
The ISL6441 is a high-performance, triple-output controller
optimized for converting wall adapter, battery or network
intermediate bus DC input supplies into the system supply
voltages required for a wide variety of applications. Each
output is adjustable down to 0.8V. The two PWMs are
synchronized 180
°
out-of-phase reducing the RMS input
current and ripple voltage.
The ISL6441 incorporates several protection features. An
adjustable overcurrent protection circuit monitors the output
current by sensing the voltage drop across the lower
MOSFET. Hiccup mode overcurrent operation protects the
DC/DC components from damage during output
overload/short circuit conditions. Each PWM has an
independent logic-level shutdown input (SD1 and SD2).
A single PGOOD signal is issued when soft-start is complete
on both PWM controllers and their outputs are within 10% of
the set point and the linear regulator output is greater than
75% of its setpoint. Thermal shutdown circuitry turns off the
device if the junction temperature exceeds +150°C.
Features
• Wide Input Supply Voltage Range
- 5.6V to 24V
- 4.5V to 5.6V
• Three Independently Programmable Output Voltages
• Switching Frequency . . . . . . . . . . . . . . . . . . . . . . .1.4MHz
• Out-of-Phase PWM Controller Operation
- Reduces Required Input Capacitance and Power
Supply Induced Loads
• No External Current Sense Resistor
- Uses Lower MOSFET’s r
DS(ON)
• Bi-directional Frequency Synchronization for
Synchronizing Multiple ISL6441s
• Programmable Soft-Start
• Extensive Circuit Protection Functions
- PGOOD
- UVLO
- Overcurrent
- Over-temperature
- Independent Shutdown for Both PWMs
• Excellent Dynamic Response
- Voltage Feed-Forward with Current Mode Control
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
L28.5x5
ISL6441IRZ* ISL 6441IRZ
-40 to +85 28 Ld QFN
*Add “-T” or “-TK” suffix for tape and reel. Please refer to TB347 for
details on reel specifications.
NOTE: 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.
• QFN Package:
- QFN - Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip-Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free (RoHS Compliant)
Applications
• Power Supplies with Multiple Outputs
• xDSL Modems/Routers
• DSP, ASIC, and FPGA Power Supplies
• Set-Top Boxes
• Dual Output Supplies for DSP, Memory, Logic, µP Core
and I/O
• Telecom Systems
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. 2004, 2005, 2008, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL6441
Absolute Maximum Ratings
Supply Voltage (VCC_5V Pin) . . . . . . . . . . . . . . . . . . . . -0.3V to +7V
Input Voltage (VIN Pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+27V
BOOT1, 2 and UGATE1, 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . +35V
PHASE1, 2 and ISEN1, 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . +27V
BOOT1, 2 with Respect to PHASE1, 2 . . . . . . . . . . . . . . . . . . +6.5V
UGATE1, 2. . . . . . . . . . . .(PHASE1, 2 - 0.3V) to (BOOT1, 2 + 0.3V)
Thermal Information
Thermal Resistance (Typical)
θ
JA
(°C/W)
θ
JC
(°C/W)
28 Lead QFN (Notes 1, 2) . . . . . . . .
34
5
Maximum Junction Temperature (Plastic Package) -55°C to +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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:
1.
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.
2. For
θ
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Block Diagram” on page 3 and “Typical
Application Schematic” on page 4. V
IN
= 5.6V to 24V, or VCC_5V = 5V ±10%, T
A
= -40°C to +85°C, Typical
values are at T
A
= +25°C. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise
specified. Temperature limits established by characterization and are not production tested.
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
VIN SUPPLY
Input Voltage Range
VCC_5V SUPPLY (Note 3)
Input Voltage
Output Voltage
Maximum Output Current
SUPPLY CURRENT
Shutdown Current (Note 4)
Operating Current (Note 5)
REFERENCE SECTION
Nominal Reference Voltage
Reference Voltage Tolerance
POWER-ON RESET
Rising VCC_5V Threshold
Falling VCC_5V Threshold
OSCILLATOR
Total Frequency Variation
Peak-to-Peak Sawtooth Amplitude (Note 6)
5.6
12
24
V
VIN = VCC_5V
V
IN
> 5.6V, I
L
= 20mA
V
IN
= 12V
4.5
4.5
60
5.0
5.0
-
5.6
5.5
-
V
V
mA
SD1 = SD2 = GND
-
-
50
2.0
375
4.0
µA
mA
-
-1.0
0.8
-
-
1.0
V
%
4.25
3.95
4.45
4.2
4.5
4.4
V
V
1.25
V
IN
= 12V
V
IN
= 5V
-
-
-
-
5.1
3.5
-
10
VCC - 0.6V
1.4
1.5
0.625
1.0
-
5.6
-
-
-
-
1.55
-
-
-
10.0
6.2
-
1.5
-
-
MHz
V
V
V
ns
MHz
V
V
ns
V
Ramp Offset (Note 7)
SYNC Input Rise/Fall Time (Note 7)
SYNC Frequency Range
SYNC Input HIGH Level
SYNC Input LOW Level
SYNC Input Minimum Pulse Width (Note 7)
SYNC Output HIGH Level
5
FN9197.3
May 26, 2009
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
