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

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Dual 2A, 500kHz Wide Input Range Buck Regulator


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

WEBENCH® Designer LM26400Y

  Min   Max Range
Vin1  V 3.00 to 20.00V
Vout1  V 0.6 to 16V
Iout1  A ≤ 2.00A
Vin2  V 3.00 to 20.00V
Vout2  V 0.6 to 16V
Iout2  A ≤ 2.00A
Ambient Temp  °C -40.00 to 125.00°C


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Part number Order 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) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM26400Y Order now 3     20     0.6     16     2     2     500     500     4     Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up    
Current Mode     96     -40 to 125     Catalog     HTSSOP | 16
WSON | 16    
Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16WSON: 25 mm2: 5 x 5 (WSON | 16)    
LM26420-Q1 Order now 3     5.5     0.8     4.5     2     2     550     2200     0.9     Enable
Light Load Efficiency
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Multiple Outputs    
Current Mode     98     -40 to 125     Automotive     HTSSOP | 20
WQFN | 16    
Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
16WQFN: 16 mm2: 4 x 4 (WQFN | 16)