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EL7556B

更新时间： 2024-11-05 22:50:59
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英特矽尔 - INTERSIL /
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11页 199K
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Integrated Adjustable 6 Amp Synchronous Switcher

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EL7556B 数据手册

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EL7556B  
®
October 5, 2001  
FN7292  
Integrated Adjustable 6 Amp  
Synchronous Switcher  
Features  
• EL7556/EL7556A Pin-compatible  
The EL7556B is an adjustable  
synchronous DC:DC switching  
regulator optimized for a 5V input and  
• Improved temperature and voltage ranges  
• 6A continuous load current  
• Precision internal 1% reference  
• 1.0V to 3.8V output voltage  
• Internal power MOSFETs  
• >90% efficiency  
1.0V-3.8V output. By combining integrated NMOS power  
FETs with a fused-lead package, the EL7556B can supply  
up to 6A continuous output current without the use of  
external power devices or discrete heat sinks, thereby  
minimizing design effort and overall system cost.  
On-chip resistorless current sensing is used to achieve  
stable, highly efficient, current-mode control. The EL7556B  
also incorporates the VCC2DET function to directly interface  
with the Intel P54 and P55 microprocessors. Depending on  
the state of VCC2DET, the output voltage is internally preset  
to 3.5V or a user-adjustable voltage using two external  
resistors. In both internal and external feedback modes the  
active-high PWRGD output indicates when the regulator  
output is within ±10% of the programmed voltage. An on-  
board sensor monitors die temperature (OT) for over-  
temperature conditions and can be connected directly to  
OUTEN to provide automatic thermal shutdown. Adjustable  
oscillator frequency and slope compensation allow added  
flexibility in overall system design.  
• Synchronous switching  
• Adjustable slope compensation  
• Over-temperature indicator  
• Pulse-by-pulse current limiting  
• Operates up to 1MHz  
• 1.5% typical output accuracy  
• Adjustable oscillator with sync  
• Remote enable/disable  
• Intel P54- and P55-compatible  
• VCC2DET interface  
The EL7556B is available in a 28-pin SO package and is  
specified for operation over the full -40°C to +85°C  
temperature range.  
• Internal soft-start  
Applications  
• PC motherboards  
Pinout  
• Local high power CPU supplies  
• 5V to 1.0V DC:DC conversion  
• Portable electronics/instruments  
• P54 and P55 regulators  
• GTL + Bus power supply  
EL7556B  
(28-PIN SO)  
TOP VIEW  
R4  
R3  
V
IN  
100Ω  
150Ω  
D3  
D2  
1
2
3
4
5
6
7
8
9
FB1  
CREF  
FB2 28  
CP 27  
C4  
0.1µF  
C7  
C 5  
D4*  
(Optional)  
1µF  
R1  
39pF  
CSLOPE C2V 26  
C8 220pF  
20Ω  
COSC  
VDD  
VIN  
VSS 25  
VHI 24  
D1  
R6  
C11  
0.22µF  
R5  
5.1Ω  
Ordering Information  
C 6 39.2Ω  
LX 23  
0.1µF  
VSSP  
VIN  
LX 22  
V
OUT =  
1V*(1+R3/R4)  
TAPE &  
L1  
2.5µH  
C9  
C12  
1µF  
LX 21  
V
PART NUMBER  
EL7556BCM  
PACKAGE  
28-Pin SO  
28-Pin SO  
REEL  
PKG. NO.  
MDP0027  
MDP0027  
IN  
C10  
1mF  
660µF  
VSSP  
LX 20  
C3  
10 VSSP  
11 VSSP  
12 VSSP  
VSSP 19  
VSSP 18  
TEST 17  
-
1µF  
EL7556BCM-T13  
13”  
Connect to VSSP for  
external feedback  
VCC2DET  
13  
16  
PWRGD  
14 OUTEN  
OT 15  
C12 - 1µF  
C3, C4, C5, C6, C7 C8 - ceramic  
C5, C11 - ceramic or tantalum  
C9 - Sprague 293D337X96R3 2X330µF  
C10 - Sprague 293D337X96R3 3X330µF  
L1 - Pulse Engineering, PE-53681  
D1-D4: BAT54S fast diode  
D4 Required for EL7556ACM Only  
Manufactured under U.S. Patents No. 5,723,974 and No. 5,793,126  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.  
All other trademarks mentioned are the property of their respective owners.  
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