ISL9440, ISL9440A, ISL9441
Data Sheet
February 9, 2015
FN6383.2
Triple, 180° Out-of-Phase, Step-Down
PWM and Single Linear Controller
The ISL9440, ISL9440A and ISL9441 are quad-output
synchronous buck controllers that integrate 3 PWM
controllers and 1 low drop-out linear regulator controller, which
are full featured and designed to provide multi-rail power for
use in products such as cable and satellite set-top boxes,
VoIP gateways, cable modems, and other home connectivity
products as well as a variety of industrial and general purpose
applications. Each output is adjustable down to 0.8V. The
PWMs are synchronized at 180° out of phase thus reducing
the RMS input current and ripple voltage.
The ISL9440, ISL9440A and ISL9441 offer internal soft-start,
independent enable inputs for ease of supply rail
sequencing, and integrated UV/OV/OC/OT protections in a
space conscious 5mmx5mm QFN package. The ISL9440
and ISL9440A offers an early warning function to output a
logic signal to warn the system to back up data when the
input voltage falls below a certain level.
The ISL9440, ISL9440A and ISL9441 are utilize internal loop
compensation to keep minimum peripheral components for
compact design and a low total solution cost. These devices
are implemented with current mode control with feed forward
to cover various applications even with fixed internal
compensations.
The table below shows the difference in terms of the
ISL9440, ISL9440A and ISL9441 features.
PART
NUMBER
ISL9440
ISL9440A
ISL9441
EARLY
WARNING
YES
YES
NO
SWITCHING FREQUENCY
(kHz)
300
600
300
Features
• Three integrated synchronous buck PWM controllers
- Internal bootstrap diodes
- Internal compensation
- Internal soft-start
• Independent control for each regulator and programmable
output voltages; independent enable/shutdown
• Fixed Switching Frequency: 300kHz (ISL9440, ISL9441);
600kHz (ISL9440A)
• Adaptive shoot through protection on all synchronous
buck controllers
• Independently programmable voltage outputs
• Out-of-phase switching to reduce input capacitance
(0°/180°/0°)
• No external current sense resistor
- Uses lower MOSFET’s r
DS(ON)
• Current mode controller with voltage feed forward
• Complete protection
- Overcurrent, overvoltage, undervoltage lockout,
over-temperature
• Cycle-by-cycle current limiting
• Wide input voltage range
- Input rail powers VIN Pin: 5.6V to 24V
- Input rail powers VCC_5V Pin (VIN tied to VCC_5V, for
5V input applications): 4.5V to 5.6V
• Early warning (ISL9440, ISL9440A) on input voltage
failure
• Integrated reset function (ISL9440, ISL9440A)
• Pb-free (RoHS compliant)
Applications
• Satellite and cable set-top boxes
• Cable modems
• VoX gateway devices
• NAS/SAN devices
Related Literature
• Technical Brief
TB389
“PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Copyright Intersil Americas LLC 2007, 2015. 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.
ISL9440, ISL9440A, ISL9441
Pinout
ISL9440, ISL9440A, ISL9441
(32 LD 5X5 QFN)
TOP VIEW
PHASE1
PHASE2
25
24
23
22
21
20
19
18
17
9
G4
10
LDOFB
11
SGND
12
OCSET2
13
FB2
14
EN2
15
OCSET3
16
FB3
ISEN2
PGND
LGATE3
UGATE3
BOOT3
PHASE3
ISEN3
EN3
UGATE1
UGATE2
27
LGATE1
LGATE2
BOOT1
BOOT2
26
32
ISEN1
PGOOD
VCC_5V
VIN
EN1
FB1
OCSET1
RST
1
2
3
4
5
6
7
8
31
30
29
28
Ordering Information
PART NUMBER
(Note 1, 2, 3)
ISL9440IRZ*
ISL9440AIRZ*
ISL9441IRZ*
NOTES:
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
ISL9440, ISL9440A, ISL9441.
For more information on MSL, please
see tech brief
TB363
PART
MARKING
ISL9440IRZ
9440AIRZ
ISL9441IRZ
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
PACKAGE
(Pb-Free)
32 Ld 5x5 QFN
32 Ld 5x5 QFN
32 Ld 5x5 QFN
PKG.
DWG. #
L32.5x5B
L32.5x5B
L32.5x5B
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FN6383.2
February 9, 2015
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