LM5175 42V Wide Vin 4-Switch Synchronous Buck-Boost Controller | TI.com

LM5175 (ACTIVE)

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

42V Wide Vin 4-Switch Synchronous Buck-Boost Controller - LM5175
 

Description

The LM5175 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 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 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 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

  • 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
  • Available in HTSSOP-28 and QFN-28 Packages

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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 LM25118 LM25118-Q1 LM5118 LM5175-Q1 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    
Catalog     Catalog     Automotive     Catalog     Automotive     Catalog    
HTSSOP
VQFN    
HTSSOP     HTSSOP     HTSSOP     HTSSOP     HTSSOP    

Other qualified versions of LM5175

Version Part Number Definition
Automotive LM5175-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer LM5175

  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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