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| 型号： | LTC1553CSW#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG SW CTRLR 5BIT PROG 20SOIC |
| 标准包装： | 1,000 |
| 应用： | 控制器，Intel Pentium? II |
| 输入电压： | 5V，12V |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 带卷 (TR) |
LTC1553
5-Bit Programmable
Synchronous Switching
Regulator Controller for
Pentium ? II Processor
FEATURES
DESCRIPTIO N
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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
Resistors
Fast Transient Response
Available in 20-Lead SSOP and SW Packages
The LTC ? 1553 is a high power, high efficiency switching
regulator controller optimized for 5V or 12V input to 1.8V-
3.5V output applications. It features a digitally programmable
output voltage, a precision internal reference and an internal
feedback system that provides output accuracy of ± 1.5% at
room temperature and typically ± 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.
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
APPLICATIO N S
Converter Specification.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Power Supply for Pentium II, SPARC, ALPHA and
PA-RISC Microprocessors
High Power 5V or 12V to 1.8V-3.5V Regulators
Pentium is a registered trademark of Intel Corporation.
TYPICAL APPLICATIO N
PV CC
12V
V IN
5V
5.6k
5.6k
5.6k
0.1 μ F
+
10 μ F
2.7k
0.1 μ F
+
10 μ F
+
C IN **
1200 μ F
× 4
PWRGD
V CC
I MAX
PV CC
PENTIUM ? II
SYSTEM
5
FAULT
OT
VID0 TO VID4
OUTEN
COMP
SS
LTC1553
SGND GND
SENSE
G1
I FB
G2
20 ?
Q1*
Q2*
L O ?
2 μ H
18A
C OUT ??
330 μ F
× 7
+
V OUT
1.8V TO
3.5V
14A
R C
C1
150pF
8.2k
C C
0.01 μ F
C SS
0.1 μ F
0.1 μ F
* SILICONIX SUD50N03-10
**SANYO 10MV1200GX
? COILTRONICS CTX02-13198 OR
PANASONIC 12TS-2R5SP
?? AVX TPSE337M006R0100
1553 F01
Figure 1. 5V to 1.8V-3.5V Supply Application
1
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