8-50V, 1.25A Constant On-Time Non-Synchronous Buck Regulator - LM34910C

LM34910C (ACTIVE)

8-50V, 1.25A Constant On-Time Non-Synchronous Buck Regulator

Description

The LM34910C Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 1.25A to the load. This buck regulator contains a 55V N-Channel Buck Switch, and is available in the thermally enhanced WSON-10 package. The hysteretic regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The current limit detection is set at 1.25A. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.

Features

  • Integrated 55V, N-Channel Buck Switch
  • Integrated Start-Up Regulator
  • Input Voltage Range: 8V to 50V
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with Load Current and Input Voltage
  • Maximum Duty Cycle Limited During Start-Up
  • Adjustable Output Voltage
  • Valley Current Limit At 1.25A
  • Precision Internal Reference
  • Low Bias Current
  • Highly Efficient Operation
  • Thermal Shutdown

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Parametrics Compare all products in Step-Down (Buck) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM34910C TPS54561 TPS54361 TPS54361-Q1 TPS54360 TPS54560 TPS54260 TPS54160A TPS54360-Q1 TPS54560-Q1 TPS54260-Q1 LM5576 LM5575
1     1     1     1     1     1     1     1     1     1     1     1     1    
8     4.5     4.5     4.5     4.5     4.5     3.5     3.5     4.5     4.5     3.5     6     6    
50     60     60     60     60     60     60     60     60     60     60     75     75    
2.5     0.8     0.8     0.8     0.8     0.8     0.8     0.8     0.8     0.8     0.8     1.23     1.23    
45     59     59     59     58.8     58.8     58     58     58.8     58.8     58     70     70    
1.25     5     3.5     3.5     3.5     5     2.5     1.5     3.5     5     2.5     3     1.5    
Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck     Buck    
1000     2500     2500     2500     2500     2500     2500     2500     2500     2500     2500     500     500    
1.25     7.5     5.5     5.5     5.5     7.5     3.5     1.8     5.5     7.5     3.5     4.2     2.1    
0.63     0.152     0.152     0.152     0.146     0.146     0.138     0.116     0.146     0.146     0.138     1     1    
  98     98     98     98     98     98     98     98     98     98     95     95    
Fixed     Adjustable     Adjustable     Adjustable     Fixed     Fixed     Adjustable     Adjustable     Fixed     Fixed     Fixed     Adjustable     Adjustable    
Not Needed     External     External     External     External     External     External     External     External     External     External     External     External    
Enable     Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Tracking    
Enable
Tracking    
          SWIFT     SWIFT     SWIFT           SIMPLE SWITCHER     SIMPLE SWITCHER    
Constant on-time (COT)     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode       Current Mode     Current Mode    
2     1     1     1     1     1     1     1     1     1     1     1.5     1.5    
Catalog     Catalog     Catalog     Automotive     Catalog     Catalog     Catalog     Catalog     Automotive     Automotive     Automotive     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 85     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
10WSON     10WSON     10WSON     10WSON     8SO PowerPAD     8SO PowerPAD     10MSOP-PowerPAD
10VSON    
10MSOP-PowerPAD
10VSON    
8SO PowerPAD     8SO PowerPAD     10MSOP-PowerPAD     20HTSSOP     16HTSSOP    
1.29 | 1ku     3.00 | 1ku     2.60 | 1ku     3.10 | 1ku     2.10 | 1ku     2.30 | 1ku     1.86 | 1ku     1.58 | 1ku     2.75 | 1ku     3.20 | 1ku     2.18 | 1ku     2.60 | 1ku     2.05 | 1ku    

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WEBENCH® LM34910C
    Min   Max   Range  
  Vin V    8.00 – 50.00V  
  Vout V    2.50 – 47.00V  
  Iout A    ≤ 1A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
 
   
 
 
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