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


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

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  • 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


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.


  • 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 Power Management Multi-Channel IC (PMIC) Solutions

Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Step-Down DC/DC Converter
Iout (Max) (A)
Iq (Typ) (mA)
Special Features
Shutdown Current (Typ) (uA)
Operating Temperature Range (C)
Approx. Price (US$)
TPS65261 TPS65261-1 TPS65262-1 TPS65263
3     3     5     3    
4.5     4.5     4.5     4.5    
18     18     18     18    
0     0     2      
3     3     3     3    
3     3     3     3    
0.6     0.6     0.79     0.74    
Over Current Protection
Power Good
Synchronous Rectification
Thermal Shutdown
VFB accuracy 1%
nPOR/Power good    
Dynamic Voltage Scaling
Ext Adjustable
I2C Control
Over Current Protection
Power Good
Thermal Shutdown
VFB accuracy 1%    
9.2     9.2     12     8    
Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85    
32VQFN     32VQFN     32VQFN     32VQFN    
1.90 | 1ku     1.90 | 1ku     2.05 | 1ku     2.35 | 1ku    

Featured tools and software

    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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