55V Wide VIN Synchronous 4-Switch Buck-Boost Controller - LM5176

LM5176 (ACTIVE)

55V Wide VIN Synchronous 4-Switch Buck-Boost Controller

 

Description

The LM5176 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5176 operates over a wide input voltage range of 4.2 V to 55 V (60 V absolute maximum) to support a variety of applications.

The LM5176 employs current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM5176 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

Features

  • Single Inductor Buck-Boost Controller for Step-Up/Step-Down DC/DC Conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V Maximum)
  • Flexible VOUT: 0.8 V to 55 V
  • VOUT Short Protection
  • High Efficiency Buck-Boost Transition
  • Adjustable Switching Frequency
  • Optional Frequency Sync and Dithering
  • Integrated 2-A MOSFET Gate Drivers
  • Cycle-by-Cycle Current Limit and Optional Hiccup
  • Optional Input or Output Average Current Limiting
  • Programmable Input UVLO and Soft-Start
  • Power Good and Output Overvoltage Protection
  • Available in HTSSOP-28 Package
  • Create a Custom Design Using the LM5176 with the WEBENCH Power Designer

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Parametrics Compare all products in Buck/Boost or Inverting Controller (External Switch)

 
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)
Special Features
Iout (Max) (A)
Operating Temperature Range (C)
Rating
Package Group
LM5176 LM25118 LM5118 LM5175 LM5175-Q1
Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost   
4    3    3    3.5    3.5   
55    42    75    42    42   
0.8    1.23    1.23    0.8    0.8   
55    38    70    55    55   
20    4    4    20    20   
100    98    98    100    100   
100    50    50    100    100   
600    500    500    600    600   
1.65    4.5    4.5    1.65    1.65   
Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
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   
  10    10    20    20   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Automotive   
HTSSOP    HTSSOP    HTSSOP    HTSSOP
VQFN   
HTSSOP   
New! Interactive Design
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WEBENCH® Designer LM5176

  Min   Max Range
Vin  V 4.0 to 55.0V
Vout  V 0.8 to 55V
Iout  A ≤ 25A
Ambient Temp  °C -40 to 150°C


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