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ISL9443

更新时间： 2024-11-05 11:13:07
品牌 Logo 应用领域
英特矽尔 - INTERSIL 控制器
页数 文件大小 规格书
23页 1297K
描述
Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller

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ISL9443 数据手册

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Triple, 180° Out-of-Phase, Synchronous Step-Down  
PWM Controller  
ISL9443  
Features  
The ISL9443 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.  
• Three Integrated Synchronous Buck PWM Controllers  
- Internal Bootstrap Diodes  
- Independent Programmable Output Voltage  
- Independent Soft-Starting and Tracking  
• Power-Good Indicator  
• Light Load Efficiency Enhancement  
- Low Ripple Diode Emulation Mode with Pulse Skipping  
• Supports Pre-Biased Output  
The ISL9443 offers 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.  
• Programmable Frequency: 200kHz to 1200kHz  
• Adaptive Shoot-Through Protection  
• Out-of-Phase Switching (0°/180°/0°)  
Switching frequency can be set between 200kHz and 1200kHz  
using a resistor. The ISL9443 can be synchronized to an external  
clock to reduce beat frequencies.  
• No External Current Sense Resistor  
- Uses Lower MOSFET’s rDS(ON)  
• Complete Protection  
The ISL9443 utilizes internal loop compensation to keep  
minimum peripheral components for a compact design and a  
low total solution cost. The controller is implemented with  
current mode control with feed forward to cover various  
applications even with fixed internal compensation.  
- Overcurrent, Overvoltage, Over-Temperature  
• Wide Input Voltage Range: 4.5V to 26V  
• Pb-Free (RoHS Compliant)  
Applications  
• VoX Gateway Devices  
• NAS/SAN Devices  
Related Literature  
• Technical Brief TB389 “PCB Land Pattern Design and Surface  
Mount Guidelines for QFN (MLFP) Packages”  
• ATX power supplies  
+12V  
+
Q1  
Q2  
CIN1  
L2  
2.2µH  
CIN2  
VOUT2  
+3.3V,6A  
0.1µF  
CB1  
0.1µF  
CB2  
+
CO2  
R9  
11.5kΩ  
VOUT1  
100µF  
RESN2  
1.3kΩ  
L1  
RESN1  
+1.0V, 6A  
1.3kΩ  
1.0µH  
+
CO1  
ISEN1  
ISEN2  
FB2  
100µF  
R8  
VIN  
VCC_5V  
+12V  
3.09kΩ  
+12V  
C1  
4.7µF  
UGATE3  
BOOT3  
Q3  
ISL9443  
R4  
L3  
3.3µH  
CB3  
0.1µF  
VOUT3  
+5.0V,6A  
EN23  
15.8kΩ  
PHASE3  
+
CO3  
100µF  
FB1  
RT  
RESN3  
1.3kΩ  
LGATE3  
ISEN3  
R3  
R4  
31.6kΩ  
EN/SS1  
RT  
CSS  
10nF  
10.7kΩ  
R3  
1.74kΩ  
49.9kΩ  
R5  
R6  
200kΩ  
R7  
200kΩ  
100kΩ  
FIGURE 1. TYPICAL APPLICATION  
June 20, 2011  
FN7663.0  
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.  
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