LM5176 55V Wide VIN Synchronous 4-Switch Buck-Boost Controller | TI.com

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 & inverting controllers (external switch)

 
Topology
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
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
LM5176 LM25118 LM25118-Q1 LM34936 LM5118 LM5118-Q1 LM5170-Q1 LM5175 LM5175-Q1 LM5176-Q1
Buck-Boost     Buck-Boost     Buck-Boost     Buck-Boost     Buck-Boost     Buck-Boost     Boost
Buck    
Buck-Boost     Buck-Boost     Buck-Boost    
4     3     3     4.2     3     3     4     3.5     3.5     4    
55     42     42     30     75     75     80     42     42     55    
0.8     1.23     1.23     0.8     1.23     1.23     4     0.8     0.8     0.8    
55     38     38     30     70     70     80     55     55     55    
100     98     98     100     98     98     99     100     100     100    
100     50     50     100     50     50     50     100     100     100    
600     500     500     600     500     500     500     600     600     600    
2     4.5     4.5     2     4.5     4.5     1     1.65     1.65     2    
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    
Enable
Frequency Synchronization    
Enable
Frequency Synchronization    
Adjustable Current Limit
Adjustable UVLO
Enable
Frequency Synchronization
Light Load Efficiency
Load Disconnect
Multiple Outputs
Phase Interleaving
Power Good
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    
Adjustable Current Limit
Enable
Frequency Synchronization
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
  10     10       10     10     50     20     20      
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 125     -40 to 125     -40 to 125    
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