LM26420

更新时间： 2024-11-23 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
28页	609K
描述
Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator

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LM26420 数据手册

August 31, 2010

LM26420

Dual 2.0A, High Frequency Synchronous Step-Down DC-

DC Regulator

General Description

Features

The LM26420 regulator is a monolithic, high frequency, dual

PWM step-down DC/DC converter in a 16 Pin LLP and a 20

Pin eTSSOP package. It provides all the active functions to

provide local DC/DC conversion with fast transient response

and accurate regulation in the smallest possible PCB area.

With a minimum of external components, the LM26420 is

easy to use. The ability to drive two 2.0A loads with an internal

75 mΩ PMOS top switch and an internal 50 mΩ NMOS bottom

switch using state-of-the-art 0.5 µm BiCMOS technology re-

sults in the best power density available. The world-class

control circuitry allows on-times as low as 30ns, thus sup-

porting exceptionally high frequency conversion over the en-

tire 3V to 5.5V input operating range down to the minimum

output voltage of 0.8V. Switching frequency is internally set

to 550 kHz or 2.2 MHz, allowing the use of extremely small

surface mount inductors and chip capacitors. Even though the

operating frequency is high, efficiencies up to 93% are easy

to achieve. External shutdown is included, featuring an ultra-

low stand-by current. The LM26420 utilizes current-mode

control and internal compensation to provide high-perfor-

mance regulation over a wide range of operating conditions.

Additional features include internal soft-start circuitry to re-

duce inrush current, pulse-by-pulse current limit, thermal

shutdown, power good indicators, precision enables, and out-

put over-voltage protection.

Input voltage range of 3.0V to 5.5V

■

Output voltage range of 0.8V to 4.5V

2.0A output current per output

High Switching Frequencies

2.2MHz (LM26420X)

0.55MHz (LM26420Y)

75mΩ PMOS switch

50mΩ NMOS switch

0.8V, 1.5% Internal Voltage Reference

■

Internal soft-start

Independent power good for each output

Independent precision enable for each output

Current mode, PWM operation

Thermal Shutdown

Over voltage protection

Start-up into Pre-biased Output Loads

Outputs are 180° out of phase

Applications

Local 5V to Vcore Step-Down Converters

■

Core Power in HDDs

Set-Top Boxes

USB Powered Devices

DSL Modems

Powering Core and I/O voltages for FPGAs, CPLDs, and

ASICs

Typical Application Circuit

30069664

30069684

300696

www.national.com

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中文翻译

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与LM26420相关器件

型号	品牌	获取价格	描述	数据表
LM26420_15	TI	获取价格	LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Con
LM26420-Q0	TI	获取价格	LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Con
LM26420Q0XMH/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420Q0XMHX/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420-Q1	TI	获取价格	LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous DC-DC Con
LM26420Q1XMH/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420Q1XMHX/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| PWP \| 20 \| -40 to
LM26420Q1XSQ/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| RUM \| 16 \| -40 to
LM26420Q1XSQX/NOPB	TI	获取价格	通过汽车认证的双路 2A 高效同步直流/直流转换器 \| RUM \| 16 \| -40 to
LM26420XMH	NSC	获取价格	Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator

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