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參數(shù)資料
| 型號： | LTC1553 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor(用于奔騰II處理器的5位可編程同步開關穩(wěn)壓器) |
| 中文描述： | 5位可編程同步開關穩(wěn)壓器控制器的奔騰II處理器（用于奔騰2處理器的5位可編程同步開關穩(wěn)壓器） |
| 文件頁數(shù)： | 1/24頁 |
| 文件大小： | 335K |
| 代理商： | LTC1553 |
1
LTC1553
5-Bit Programmable
Synchronous Switching
Regulator Controller for
Pentium
II Processor
FEATURES
DESCRIPTIO
N
U
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
Converter Specification
I
5-Bit Digitally Programmable 1.8V to 3.5V Fixed
Output Voltage
I
Provides All Features Required by the Intel
Pentium
II Processor VRM 8.2 DC/DC
Converter Specification
I
Flags for Power Good, Over-Temperature and
Overvoltage Fault
I
19A Output Current Capability from a 5V or 12V Supply
I
Dual N-Channel MOSFET Synchronous Driver
I
Initial Output Accuracy:
±
1.5%
I
Excellent Output Accuracy:
±
2% Typ Over Line,
Load and Temperature Variations
I
High Efficiency: Over 95% Possible
I
Adjustable Current Limit Without External Sense
Resistors
I
Fast Transient Response
I
Available in 20-Lead SSOP and SW Packages
APPLICATIO
S
U
I
Power Supply for Pentium II, SPARC, ALPHA and
PA-RISC Microprocessors
I
High Power 5V or 12V to 1.8V-3.5V Regulators
TYPICAL APPLICATIO
N
U
Figure 1. 5V to 1.8V-3.5V Supply Application
PWRGD
FAULT
OT
VID0 TO VID4
OUTEN
COMP
SS
SGND
GND
SENSE
10
μ
F
Q1*
20
Q2*
0.1
μ
F
V
CC
I
MAX
PV
CC
PV
CC
12V
V
IN
5V
L
O
2
μ
H
18A
LTC1553
G1
I
FB
G2
+
0.1
μ
F
1553 F01
C
0.01
μ
F
R
C
8.2k
5.6k
2.7k
5.6k
5.6k
C
SS
0.1
μ
F
0.1
μ
F
10
μ
F
C
**
1200
μ
F
×
4
V
1.8V TO
3.5V
14A
C
OUT
330
μ
F
×
7
+
+
C1
150pF
+
5
PENTIUM
II
SYSTEM
*SILICONIX SUD50N03-10
*SANYO 10MV1200GX
COILTRONICS CTX02-13198 OR
PANASONIC 12TS-2R5SP
AVX TPSE337M006R0100
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
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