75V 宽输入电压降压-升压转换器 - LM5118

LM5118 (正在供货)

75V 宽输入电压降压-升压转换器

 

描述

The LM5118 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement a high-performance, cost-efficient Buck-Boost regulator using a minimum of external components. The Buck-Boost topology maintains output voltage regulation when the input voltage is either less than or greater than the output voltage, making it especially suitable for automotive applications. The LM5118 operates as a buck regulator while the input voltage is sufficiently greater than the regulated output voltage and gradually transitions to the buck-boost mode as the input voltage approaches the output. This dual-mode approach maintains regulation over a wide range of input voltages with optimal conversion efficiency in the buck mode and a glitch-free output during mode transitions. This easy-to-use controller includes drivers for the high-side buck MOSFET and the low-side boost MOSFET. The regulators control method is based upon current mode control using an emulated current ramp. Emulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very small duty cycles necessary in high input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input. The device is available in a power-enhanced, 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

特性

  • Ultra-Wide Input Voltage Range From 3 V to 75 V
  • Emulated Peak Current Mode Control
  • Smooth Transition Between Step-Down and Step-Up Modes
  • Switching Frequency Programmable to 500 KHz
  • Oscillator Synchronization Capability
  • Internal High Voltage Bias Regulator
  • Integrated High and Low-Side Gate Drivers
  • Programmable Soft-Start Time
  • Ultra-Low Shutdown Current
  • Enable Input Wide Bandwidth Error Amplifier
  • 1.5% Feedback Reference Accuracy
  • Thermal Shutdown
  • Package: 20-Pin HTSSOP (Exposed Pad)
  • Create a Custom Design Using the LM5118 With the WEBENCH® Power Designer

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参数 与其它产品相比 降压/升压或反相控制器 (外部开关)

 
Topology
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Min) (A)
Duty Cycle (Max) (%)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Iout (Max) (A)
Operating Temperature Range (C)
Rating
Package Group
LM5118 LM25118 LM25118-Q1 LM5118-Q1 LM5175 LM5175-Q1 LM5176
Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost   
3    3    3    3    3.5    3.5    4   
75    42    42    75    42    42    55   
1.23    1.23    1.23    1.23    0.8    0.8    0.8   
70    38    38    70    55    55    55   
4    4    4    4    20    20    20   
98    98    98    98    100    100    100   
50    50    50    50    100    100    100   
500    500    500    500    600    600    600   
4.5    4.5    4.5    4.5    1.65    1.65    1.65   
Enable
Frequency Synchronization   
Enable
Frequency Synchronization   
Enable
Frequency Synchronization   
Enable
Frequency Synchronization   
Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
10    10    10    10    20    20     
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Automotive    Automotive    Catalog    Automotive    Catalog   
HTSSOP    HTSSOP    HTSSOP    HTSSOP    HTSSOP
VQFN   
HTSSOP    HTSSOP   

其它合格版本 LM5118

版本 器件型号 定义
汽车电子 LM5118-Q1 Q100 适用于追求零缺陷的高可靠性汽车电子应用的器件
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WEBENCH® Designer LM5118

  最小   最大 范围
输入电压  V 3.0 to 75.0V
输出电压  V 1.23 to 70V
输出电流  A ≤ 10A
环境温度  °C -40 to 125°C


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