LM26400Y Dual 2A, 500kHz Wide Input Range Buck Regulator | TI.com


Dual 2A, 500kHz Wide Input Range Buck Regulator

Dual 2A, 500kHz Wide Input Range Buck Regulator - LM26400Y

Recommended alternative parts

  • LM26420  -  5Vin, Dual 2A Synchronous Buck With Power Good And Enable For Each Channel
  • LM26420-Q1  -  5Vin, Dual 2A Synchronous Buck With Power Good And Enable For Each Channel


The LM26400Y device is a monolithic, two-output fixed-frequency PWM step-down DC-DC regulator, in a 16-pin WSON or thermally-enhanced HTSSOP package. With a minimum number of external components and internal loop compensation, the LM26400Y is easy to use.

The ability to drive 2-A loads with an internal 175-mΩ NMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in a high-power density design. The world class control circuitry allows for an ON-time as low as 40 ns, thus supporting high-frequency conversion over the entire input range of 3 V to 20 V and down to an output voltage of only 0.6 V. The LM26400Y utilizes peak current-mode control and internal compensation to provide high-performance regulation over a wide range of line and load conditions. Switching frequency is internally set to 500 kHz, optimal for a broad range of applications in terms of size versus thermal tradeoffs.

Given a nonsynchronous architecture, efficiencies above 90% are easy to achieve. External shutdown is included, enabling separate turnon and turnoff of the two channels. Additional features include programmable soft-start circuitry to reduce inrush current, pulse-by-pulse current limit and frequency foldback, integrated bootstrap structure, and thermal shutdown.


  • Input Voltage Range of 3 V to 20 V
  • Dual 2-A Output
  • Output Voltage Down to 0.6 V
  • Internal Compensation
  • 500-kHz PWM Frequency
  • Separate Enable Pins
  • Separate Soft-Start Pins
  • Frequency Foldback Protection
  • 175-mΩ NMOS Switch
  • Integrated Bootstrap Diodes
  • Overcurrent Protection
  • HTSSOP and WSON Packages
  • Thermal Shutdown

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Parametrics Compare all products in Buck converters (integrated switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
LM26400Y LM26420-Q1
3     3    
20     5.5    
0.6     0.8    
16     4.5    
2     2    
2     2    
500     550    
500     2200    
4     0.9    
Light Load Efficiency
Power Good
Pre-Bias Start-Up    
Light Load Efficiency
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
Current Mode     Current Mode    
96     98    
-40 to 125     -40 to 125    
Catalog     Automotive    
WSON | 16    
WQFN | 16    
Converter     Converter    

WEBENCH® Designer LM26400Y

  Min   Max Range
Vin1  V 3.00 to 20.00V
Vout1  V 0.60 to 16.00V
Iout1  A ≤ 2.00A
Vin2  V 3.00 to 20.00V
Vout2  V 0.60 to 16.00V
Iout2  A ≤ 2.00A
Ambient Temp  °C -40 to 125°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'