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LTC1553CG

更新时间： 2024-11-08 22:57:35
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
24页 402K
描述
5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor

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LTC1553CG 数据手册

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LTC1553  
5-Bit Programmable  
Synchronous Switching  
Regulator Controller for  
Pentium® II Processor  
U
FEATURES  
DESCRIPTION  
The LTC®1553 is a high power, high efficiency switching  
regulator controller optimized for 5V or 12V input to 1.8V-  
3.5Voutputapplications.Itfeaturesadigitallyprogrammable  
output voltage, a precision internal reference and an internal  
feedback system that provides output accuracy of ±1.5% at  
roomtemperatureandtypically±2%over-temperature, load  
current and line voltage shifts. The LTC1553 uses a synchro-  
nous switching architecture with two external N-channel  
output devices, providing high efficiency and eliminating the  
need for a high power, high cost P-channel device. Addition-  
ally, it senses the output current across the on-resistance of  
the upper N-channel FET, providing an adjustable current  
limit without an external low value sense resistor.  
■
5-Bit Digitally Programmable 1.8V to 3.5V Fixed  
Output Voltage  
■
Provides All Features Required by the Intel  
Pentium® II Processor VRM 8.2 DC/DC  
Converter Specification  
Flags for Power Good, Over-Temperature and  
Overvoltage Fault  
■
■
19A Output Current Capability from a 5V or 12V Supply  
■
Dual N-Channel MOSFET Synchronous Driver  
■
Initial Output Accuracy: ±1.5%  
■
Excellent Output Accuracy: ±2% Typ Over Line,  
Load and Temperature Variations  
High Efficiency: Over 95% Possible  
■
■
Adjustable Current Limit Without External Sense  
The LTC1553 free-runs at 300kHz and can be synchronized  
to a faster external clock if desired. It includes all the inputs  
and outputs required to implement a power supply conform-  
ing to the Intel Pentium® II Processor VRM 8.2 DC/DC  
Converter Specification.  
Resistors  
Fast Transient Response  
■
■
Available in 20-Lead SSOP and SW Packages  
U
APPLICATIONS  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Pentium is a registered trademark of Intel Corporation.  
■
Power Supply for Pentium II, SPARC, ALPHA and  
PA-RISC Microprocessors  
■
High Power 5V or 12V to 1.8V-3.5V Regulators  
U
PV  
CC  
12V  
V
IN  
5V  
TYPICAL APPLICATION  
+
0.1µF  
10µF  
+
+
C
**  
IN  
2.7k  
0.1µF  
10µF  
1200µF  
× 4  
5.6k  
5.6k  
5.6k  
V
CC  
I
MAX  
PV  
CC  
PWRGD  
FAULT  
†
L
O
Q1*  
Q2*  
G1  
2µH  
18A  
PENTIUM® II  
SYSTEM  
V
OUT  
20Ω  
OT  
1.8V TO  
3.5V  
14A  
5
LTC1553  
I
FB  
VID0 TO VID4  
OUTEN  
††  
C
+
OUT  
330µF  
× 7  
G2  
COMP  
SS  
SGND  
GND  
SENSE  
R
C
8.2k  
C1  
150pF  
C
SS  
0.1µF  
C
*
SILICONIX SUD50N03-10  
C
0.1µF  
0.01µF  
** SANYO 10MV1200GX  
†
COILTRONICS CTX02-13198 OR  
PANASONIC 12TS-2R5SP  
††  
AVX TPSE337M006R0100  
1553 F01  
Figure 1. 5V to 1.8V-3.5V Supply Application  
1
1234567...24

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LTC1553CG 替代型号

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