4.5V to 18V Input Voltage, 3A/2A/2A Output Current Triple Synchronous Buck Converter - TPS65261

TPS65261 (ACTIVE)

4.5V to 18V Input Voltage, 3A/2A/2A Output Current Triple Synchronous Buck Converter

Recommended alternative parts

  • TPS65262  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   4.5V to 18V Input, 3A/1A/1A Triple Synchronous Step-Down Converter with 200mA/100mA Dual LDOs

Description

The TPS65261, TPS65261-1 is a monolithic triple synchronous step-down (buck) converter with 3A/2A/2A output currents. A wide 4.5V to 18V input supply voltage range encompasses the most intermediate bus voltages operating off 5V, 9V, 12V or 15V power bus. The converter, with constant frequency peak current mode, is designed to simplify its application while giving designers options to optimize the system according to targeted applications. The switching frequency of the converters can be adjusted from 250kHz to 2MHz with an external resistor. The 180° out-of-phase operation between Buck1 and Buck2, 3 (Buck2 and 3 run in phase) minimizes the input filter requirements.

The TPS65261, TPS65261-1 features an automatic power sequence with connecting MODE pin to V7V and configuring EN1/2/3 pins. The device also features an open drain RESET signal to monitor power down.

At light load, the TPS65261 automatically operates in pulse skipping mode (PSM) and the TPS65261-1 operates in force continuous current mode (FCC). PSM mode provides high efficiency by reducing switching losses at light loads and FCC mode reduces noise susceptibility and RF interference.

The device features overvoltage protection, overcurrent and short-circuit protection and over-temperature protection. A power good pin asserts when any output voltages are out of regulation.

Features

  • Operating Input Supply Voltage Range
    (4.5 V to 18 V)
  • Feedback Reference Voltage 0.6V±1%
  • Maximum Continuous Output Current 3A/2A/2A
  • Adjustable Clock Frequency from 250kHz to 2MHz
  • Dedicated Enable and Soft Start Pins for Each Buck
  • Automatic Power-up/Power-down Sequence
  • Pulse Skipping Mode (PSM) at Light Load (TPS65261 only)
  • Output Voltage Power Good Indicator
  • Input Voltage Power Failure Indicator
  • Thermal Overloading Protection

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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)
Iout2 (Max) (A)
Vout2 (Min) (V)
Vout2 (Max) (V)
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$)
TPS65261 TPS65276V TPS53318 TPS563900 LM21305 TPS56428 TPS51363 TPS51362 TPS51367 TPS65281 TPS53319 TPS53915 TPS54340
3     2     1     2     1     1     1     1     1     1     1     1     1    
4.5     4.5     1.5     4.5     3     4.5     3     3     3     4.5     1.5     1.5     4.5    
18     18     22     18     18     18     22     22     22     18     22     18     42    
0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.8     0.6     0.6     0.8    
  15     5.5     15     0.6     5.5     2     2     2     17     5.5     5.5     41    
3     6     8     3.5     5     4     10     10     12     3     14     12     3.5    
2     3.5       3.5                      
0.6     0.6       0.68                      
  15       1.95                      
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
2000     1600     1000     1600     1500     650     800     800     800     1400     1000     1000     2500    
    8     4.5     7     5.3     12     12     16       22       5.5    
0.6     10     0.32     1.2     9     0.25     0.56     0.1     0.1     0.8     0.32     1.35     0.146    
95     95     90     100     100     85     87     87     87       90       98    
Adjustable     Adjustable     Adjustable     Adjustable     Fixed     Fixed     Adjustable     Adjustable     Adjustable     Adjustable     Fixed     Adjustable     Fixed    
External     External     Not Needed     External     External     Not Needed     Not Needed     Not Needed     Not Needed     External     Not Needed     Not Needed     External    
Adjustable UVLO
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Adjustable Current Limit
Adjustable UVLO
Dynamic Voltage Scaling
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification
Telemetry    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Output Discharge
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Output Discharge
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Output Discharge
Power Good
Synchronous Rectification    
Adjustable Current Limit
Adjustable UVLO
Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Dynamic Voltage Scaling
Enable
Light Load Efficiency
PMBus
Power Good
Synchronous Rectification
Voltage Margining    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
    SWIFT         SWIFT             SWIFT     SWIFT      
Current Mode     Current Mode     D-CAP     Current Mode     Current Mode     D-CAP2     D-CAP2     D-CAP2     D-CAP2     Current Mode     D-CAP     D-CAP3     Current Mode    
1     1     1     1     1.5     1     1     1     1     1     1     0.5     1    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 125     -40 to 85     -40 to 85     -40 to 85     -40 to 125     -10 to 85     -10 to 85     -10 to 85     -40 to 125     -40 to 85     -40 to 85     -40 to 125    
32VQFN     32HTSSOP
36VQFN    
22LSON-CLIP     32HTSSOP     28WQFN     8SO PowerPAD     28VQFN-CLIP     28VQFN-CLIP     28VQFN-CLIP     16VQFN     22LSON-CLIP     28VQFN-CLIP     8SO PowerPAD    
1.90 | 1ku     2.50 | 1ku     3.05 | 1ku     2.35 | 1ku     2.50 | 1ku     1.22 | 1ku     2.10 | 1ku     2.30 | 1ku     2.70 | 1ku     1.20 | 1ku     3.35 | 1ku     3.00 | 1ku     1.68 | 1ku    

Featured tools and software

WEBENCH® TPS65261
    Min   Max   Range  
  Vin1 V    4.50 – 18.00V  
  Vout1 V    0.60 – 5.50V  
  Iout1 A    ≤ 3.00A  

  Vin2 V    4.50 – 18.00V  
  Vout2 V    0.60 – 5.50V  
  Iout2 A    ≤ 2.00A  

  Vin3 V    4.50 – 18.00V  
  Vout3 V    0.60 – 5.50V  
  Iout3 A    ≤ 2.00A  

  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
'Cvdd Cldo12 Rp L1_ch1 Cin_ch1 Rfbb_ch1 Rfbt_ch1 C1_ch1 Cout_ch1 L1_ch2 Cin_ch2 Rfbb_ch2 Rfbt_ch2 C1_ch2 Cout_ch2 Cin_ch3 Cout_ch3 Rfbt_ch3 Rfbb_ch3 Cin_ch4 Cout_ch4 Rfbt_ch4 Rfbb_ch4'
 
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