Datasheet > LM2720_09

LM2720_09

更新时间： 2024-10-27 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
10页	336K
描述
5-Bit Programmable, High Frequency Multi-phase PWM Controller

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LM2720_09 数据手册

OBSOLETE

February 3, 2000

LM2720

5-Bit Programmable, High Frequency Multi-phase PWM

Controller

The LM2720 also provides input under-voltage lock-out with

hysteresis, input over-current protection and output voltage

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 ca-

pacitor size. Due to the nominal operating frequency of 2 MHz

per phase, the size of the output inductors can be greatly re-

duced which results in a much faster load transient response

and a dramatically shrunk output capacitor bank. Micropro-

cessor power supplies with all surface mount components

can be easily built.

power good detection.

Features

Ultra fast load transient response

■

Enables all surface-mount-design

Selectable 2, 3, 4 phase operation

Clock frequency from 40 kHz to 10 MHz

Precision load current sharing

5-bit programmable from 3.5V to 1.3V

VID code compatible to VRM 8.X specification

Output voltage is 2.0V for VID code 11111

Selectable internal or external clock

Digital 16-step soft start

Input under-voltage lock-out, over-current protection

Open-drain power good signal output

The internal high speed transconductance amplifier guaran-

tees good dynamic performance.

Applications

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 control

and multi-chip operation.

Servers and workstations

■

High current, ultra-fast transient microprocessors

Pin Configuration

24-Pin Plastic SOIC

10132201

Top View

See NS Package Number M24B

101322

www.national.com

101322 Version 3 Revision 1 Print Date/Time: 2009/03/26 20:37:33

12 3 4 5 6 7...10

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与LM2720_09相关器件

型号	品牌	获取价格	描述	数据表
LM2720M	NSC	获取价格	5-Bit Programmable, High Frequency Multi-phase PWM Controller
LM2720M/NOPB	TI	获取价格	SWITCHING CONTROLLER, 8700kHz SWITCHING FREQ-MAX, PDSO24, PLASTIC, SOIC-24
LM27212	NSC	获取价格	Two-Phase Current-Mode Hysteretic Buck Controller
LM27212MTD	NSC	获取价格	Two-Phase Current-Mode Hysteretic Buck Controller
LM27212MTDX	NSC	获取价格	Two-Phase Current-Mode Hysteretic Buck Controller
LM27212SQ	NSC	获取价格	Two-Phase Current-Mode Hysteretic Buck Controller
LM27212SQX	NSC	获取价格	Two-Phase Current-Mode Hysteretic Buck Controller
LM27213	NSC	获取价格	Single Phase Hysteretic Buck Controller
LM27213	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller
LM27213_15	TI	获取价格	LM27213 Single Phase Hysteretic Buck Controller

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