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參數(shù)資料
| 型號： | LMS1145M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 151K |
| 代理商： | LMS1145M |
LMS1145
5-Bit Programmable, High Frequency Multi-phase PWM
Controller
General Description
The LMS1145 provides an attractive solution for power sup-
plies of high power microprocessors (such as Pentium II,
MII,K6-2, K6-3, Merced, etc.) exhibiting ultra fast load
transients. Compared to a conventional single-phase supply,
an LMS1145 based multi-phase supply distributes the ther-
mal and electrical loading among components in multiple
phases and greatly reduces the corresponding stress in
each component. The LMS1145 can be programmed to con-
trol either a 3-phase converter or a 4-phase converter.
Phase shift among the phases is 120 in the case of three
phase and 90 with four-phase. Because the power channels
are out of phase, there can be significant ripple cancellation
for both the input and output current, resulting in reduced in-
put and output capacitor size. Due to the nominal operating
frequency of 2 MHz per phase, the size of the output induc-
tors can be greatly reduced which results in a much faster
load transient response and a dramatically shrunk output ca-
pacitor bank. Microprocessor power supplies with all surface
mount components can be easily built.
The internal high speed transconductance amplifier guaran-
tees good dynamic performance.
The internal master clock frequency of up to 8 MHz is set by
an external reference resistor. An external clock of 10 MHz
can also be used to drive the chip to achieve frequency con-
trol and multi-chip operation.
The LMS1145 also provides input under-voltage lock-out
with hysteresis, input over-current protection and output volt-
age power good detection.
Features
n Ultra fast load transient response
n Enables all surface-mount-design
n Selectable 2, 3, 4 phase operation
n Clock frequency from 40 kHz to 10 MHz
n Precision load current sharing
n 5-bit programmable from 3.5V to 1.3V
n Selectable internal or external clock
n Digital 16-step soft start
n Input under-voltage lock-out, over-current protection
n Open-drain power good signal output
Applications
n Servers and workstations
n High current, ultra-fast transient microprocessors
Pin Configuration
MII is a trademark of Cyrix Corporation a wholly owned subsidiary of National Semiconductor Corporation.
Pentium is a trademark of Intel Corporation.
K6 is a trademark of Advanced Micro Devices, Inc.
24-Pin Plastic SOIC
DS101248-1
Top View
See NS Package Number M24B
November 1999
LMS1
145
5-Bit
Programmable,
High
Frequency
Multi-phase
PWM
Controller
1999 National Semiconductor Corporation
DS101248
www.national.com
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