LM5175-Q1 (ACTIVE)

42V Wide Vin Synchronous 4-Switch Buck-Boost Controller

 

Description

The LM5175-Q1 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5175-Q1 operates over a wide input voltage range of 3.5 V to 42 V (60 V maximum) to support a variety of applications.

The LM5175-Q1 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 LM5175-Q1 features selectable Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM) operation, optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to
      +125°C Ambient Operating Temperature
      Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Single Inductor Buck-Boost Controller for Step-
    Up/Step-Down DC/DC Conversion
  • Wide VIN Range: 3.5 V to 42 V, 60 V Maximum
  • Flexible VOUT Range: 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
  • Selectable CCM or DCM with Pulse Skipping
  • HTSSOP-28 Package

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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)
Features
Iout (Max) (A)
Operating Temperature Range (C)
Rating
Package Group
LM5175-Q1 LM25118 LM25118-Q1 LM5118 LM5175 LM5176
Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost    Buck/Boost   
3.5    3    3    3    3.5    4   
42    42    42    75    42    55   
0.8    1.23    1.23    1.23    0.8    0.8   
55    38    38    70    55    55   
20    4    4    4    20    20   
100    98    98    98    100    100   
100    50    50    50    100    100   
600    500    500    500    600    600   
1.65    4.5    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   
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   
20    10    10    10    20     
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Automotive    Catalog    Automotive    Catalog    Catalog    Catalog   
HTSSOP    HTSSOP    HTSSOP    HTSSOP    HTSSOP
VQFN   
HTSSOP   

Other qualified versions of LM5175-Q1

Version Part Number Definition
Catalog LM5175 TI's standard catalog product
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WEBENCH® Designer LM5175-Q1

  Min   Max Range
Vin  V 3.5 to 42.0V
Vout  V 0.8 to 55V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C


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