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參數(shù)資料
| 型號： | LM2720M/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 8700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | PLASTIC, SOIC-24 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 149K |
| 代理商： | LM2720M/NOPB |
LM2720
5-Bit Programmable, High Frequency Multi-phase PWM
Controller
General Description
The LM2720 provides an attractive solution for power sup-
plies of high power microprocessors exhibiting ultra fast load
transients. Compared to a conventional single-phase supply,
an LM2720 based multi-phase supply distributes the thermal
and electrical loading among components in multiple phases
and greatly reduces the corresponding stress in each com-
ponent. The LM2720 can be programmed to control 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 input and
output capacitor size. Due to the nominal operating fre-
quency of 2 MHz per phase, the size of the output inductors
can be greatly reduced which results in a much faster load
transient response and a dramatically shrunk output capaci-
tor 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 LM2720 also provides input under-voltage lock-out with
hysteresis, input over-current protection and output voltage
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
VID code compatible to VRM 8.X specification
n
Output voltage is 2.0V for VID code 11111
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
24-Pin Plastic SOIC
DS101322-1
Top View
See NS Package Number M24B
February 2000
LM2720
5-Bit
Programmable,
High
Frequency
Multi-phase
PWM
Controller
2000 National Semiconductor Corporation
DS101322
www.national.com
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| LM27212 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Two-Phase Current-Mode Hysteretic Buck Controller |
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| LM27212SQ/NOPB | 功能描述:IC REG CTRLR BUCK PWM CM 48-LLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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