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ISL9444EVAL1Z

更新时间： 2024-11-10 01:22:03
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瑞萨 - RENESAS /
页数 文件大小 规格书
25页 1457K
描述
Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller

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ISL9444EVAL1Z 数据手册

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DATASHEET  
ISL9444  
FN7665  
Rev 3.00  
May 29, 2012  
Triple, 180° Out-of-Phase, Synchronous Step-Down PWM Controller  
The ISL9444 is a triple-output synchronous buck controller that  
Features  
integrates three PWM controllers which are fully featured and  
• Three Integrated Synchronous Buck PWM Controllers  
- Internal Bootstrap Diodes  
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.  
- Independent Programmable Output Voltage  
- Independent Power-Good Indicators, Soft-Starting and  
Tracking  
• Power Failure Monitor  
• Light Load Efficiency Enhancement  
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.  
- 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°)  
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.  
• No External Current Sense Resistor  
- Uses Lower MOSFET’s rDS(ON)  
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.  
• Complete Protection  
- Overcurrent, Overvoltage, Over-Temperature  
• Wide Input Voltage Range: 4.5V to 28V  
• Pb-Free (RoHS Compliant)  
Related Literature  
• Technical Brief TB389 “PCB Land Pattern Design and  
Surface Mount Guidelines for QFN (MLFP) Packages”  
Applications  
• VoX Gateway Devices  
• NAS/SAN Devices  
• ATX Power Supplies  
+12V  
+
Q1  
Q2  
CIN1  
CIN2  
VOUT2  
+3.3V, 6A  
2.2µH  
L2  
0.1µF  
CB1  
0.1µF  
CB2  
+
CO2  
R9  
VOUT1  
100µF  
RESN2  
1.3kΩ  
L1  
RESN1  
1.3kΩ  
+1.0V, 6A  
11.5kΩ  
1.0µH  
+
CO1  
ISEN1  
ISEN2  
FB2  
100µF  
R8  
VIN  
VCC_5V  
+12V  
3.09kΩ  
+12V  
C1  
R2  
4.7µF  
62kΩ  
EXTBIAS  
PFI  
UGATE3  
BOOT3  
Q3  
ISL9444  
R4  
R1  
CB3  
0.1µF  
VOUT3  
+5.0V, 6A  
3.3µH  
L3  
PFO  
15.8kΩ  
10kΩ  
PHASE3  
EN2,3  
+
CO3  
100µF  
FB1  
RT  
RESN3  
1.3k  
LGATE3  
ISEN3  
Ω
R3  
R4  
31.6kΩ  
EN/SS1  
RT  
CSS  
10nF  
49.9kΩ  
10.7kΩ  
R5  
R6  
200kΩ  
R7  
R3  
1.74kΩ  
100kΩ  
200kΩ  
FIGURE 1. TYPICAL APPLICATION  
FN7665 Rev 3.00  
May 29, 2012  
Page 1 of 25  
1234567...25

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