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ISL9444IRZ Datasheet(PDF) 1 Page - Intersil Corporation

Part # ISL9444IRZ
Description  Triple, 180째 Out-of-Phase, Synchronous Step-Down PWM Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL9444IRZ Datasheet(HTML) 1 Page - Intersil Corporation

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1
Triple, 180° Out-of-Phase, Synchronous Step-Down
PWM Controller
ISL9444
The ISL9444 is a triple-output synchronous buck controller that
integrates three PWM controllers which are fully 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 0.7V. The PWMs are synchronized at 180°
out-of-phase, thus reducing the input RMS current and ripple
voltage.
The ISL9444 offers independent power-good indicators,
programmable soft-start and tracking functions for ease of
supply rail sequencing and integrated UV/OV/OC/OT
protections in a space conscious 5mmx5mm QFN package.
Switching frequency can be set between 200kHz and 1200kHz
using a resistor. The ISL9444 can be synchronized to another
ISL9444 to reduce any beat frequency.
The ISL9444 utilizes internal loop compensation to keep
minimum peripheral components for a 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.
Related Literature
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN (MLFP) Packages”
Features
• Three Integrated Synchronous Buck PWM Controllers
- Internal Bootstrap Diodes
- Independent Programmable Output Voltage
- Independent Power-Good Indicators, Soft-Starting and
Tracking
•Power Failure Monitor
• Light Load Efficiency Enhancement
- Low Ripple Diode Emulation Mode with Pulse Skipping
• Supports Pre-Biased Output
• Programmable Frequency: 200kHz to 1200kHz
• Adaptive Shoot-through Protection
• Out-of-Phase Switching (0°/180°/0°)
• No External Current Sense Resistor
- Uses Lower MOSFET’s rDS(ON)
• Complete Protection
- Overcurrent, Overvoltage, Over-Temperature
• Wide Input Voltage Range: 4.5V to 26V
• Pb-Free (RoHS Compliant)
Applications
• VoX Gateway Devices
•NAS/SAN Devices
• ATX Power Supplies
VIN
ISL9444
VCC_5V
PFI
PFO
EXTBIAS
FB1
EN2,3
ISEN1
ISEN2
ISEN3
PHASE3
BOOT3
UGATE3
LGATE3
+
CO1
L1
1.0µH
+
CIN1
CIN2
+12V
+12V
CB1
Q1
C1
4.7µF
CB2
0.1µF
0.1µF
RESN1
1.3kΩ
Q2
L2 2.2µH
RESN2
VOUT1
+1.0V, 6A
100µF
1.3kΩ
VOUT2
+3.3V, 6A
+
CO2
100µF
R1
10kΩ
R2
62kΩ
R3
31.6kΩ
R4
15.8kΩ
Q3
+12V
R5
100kΩ
0.1µF
CB3
RESN3
1.3kΩ
L3 3.3µH
VOUT3
+5.0V, 6A
+
CO3
100µF
FB2
R6
200kΩ
R7
200kΩ
R8
3.09kΩ
R9
11.5kΩ
R3
1.74kΩ
R4
10.7kΩ
EN/SS1
CSS
10nF
RT
49.9kΩ
RT
FIGURE 1. TYPICAL APPLICATION
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. 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.
May 23, 2011
FN7665.0


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