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| 型号： | LM27402SQ |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1350 kHz SWITCHING FREQ-MAX, QCC16 |
| 封装： | 4 X 4 MM, 0.80 MM HEIGHT, 0.65 MM PITCH, LLP-16 |
| 文件页数： | 1/32页 |
| 文件大小： | 653K |
| 代理商： | LM27402SQ |
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LM27402
June 14, 2010
High Performance Synchronous Buck Controller with DCR
Current Sensing
General Description
The LM27402 is a synchronous voltage mode DC/DC buck
controller with inductor DCR current sense capability. Sens-
ing the inductor current eliminates the need to add resistive
powertrain elements which increases overall efficiency and
facilitates accurate continuous current limit sensing. A 0.6V
±1% voltage reference enables high accuracy and low volt-
age capability at the output. An input operating voltage range
of 3V to 20V makes the LM27402 suitable for a large variety
of input rails.
The LM27402 voltage mode control loop incorporates input
voltage feed-forward to maintain stability throughout the en-
tire input voltage range. The switching frequency is adjustable
from 200 kHz to 1.2 MHz. Dual high current integrated N-
channel MOSFET drivers support large Q
G, low RDS(ON)
MOSFETs. A power good indicator provides power rail se-
quencing capability and output fault detection. Adjustable
external soft-start capability limits inrush current and provides
monotonic output control during startup. Other features in-
clude external tracking of other power supplies, integrated
LDO bias supply, and synchronization capability. The
LM27402 is offered in a 16 pin eTSSOP package and a 4 mm
x 4 mm 16 pin exposed LLP.
Features
■ Input operating voltage range of 3V to 20V
■ Continuous inductor DCR or shunt resistor current sensing
■ 0.6V ±1% reference (-40°C to 125°C junction
temperature)
■ Output voltage as high as 95% of input voltage
■ Integrated MOSFET drivers
■ Internal LDO bias supply
■ External clock synchronization
■ Adjustable soft-start with external capacitor
■ Pre-biased startup capability
■ Power supply tracking
■ Input voltage feed-forward
■ Power good indicator
■ Precision enable with hysteresis
Applications
■ High current, low voltage FPGA/ASIC DC/DC converters
■ General purpose high current buck converters
■ Telecom, datacom, networking, distributed power
architectures
Typical Application Circuit
30092601
PowerWise is a registered trademark of National Semiconductor Corporation.
2010 National Semiconductor Corporation
300926
www.national.com
LM27402
High
Performance
Synchronous
Buck
Controller
with
DCR
Current
Sensing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM27402SQ/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM27402SQEVAL/NOPB | 功能描述:电源管理IC开发工具 LM27402SQ EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM27402SQX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Performance Synchronous Buck Controller with DCR Current Sensing |
| LM27402SQX/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM27403 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Synchronous Buck Controller with Temperature-Compensated, Inductor-DCR-Based Overcurrent Protection and Programmable Thermal Shutdown |
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