TPS542951 4.5 V to 18 V input, 2 A / 3 A dual channel synchronous step-down converter, adjustable soft start | TI.com

TPS542951
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
4.5 V to 18 V input, 2 A / 3 A dual channel synchronous step-down converter, adjustable soft start

 

Recommended alternative parts

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Description

The TPS542951 is a dual, adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS542951 enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, and low standby current solution. The main control loops of the TPS542951 use the D-CAP2™ mode control which provides a very fast transient response with no external compensation components. The adaptive on-time control supports seamless transition between PWM mode at higher load conditions and Eco-mode™ operation at light loads. Eco-mode™ allows the TPS542951 to maintain high efficiency during lighter load conditions. The TPS542951 is able to adapt to both low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP, and ultra-low ESR, ceramic capacitors. The device provides convenient and efficient operation with input voltages from 4.5V to 18V.

The TPS542951 is available in a 4.4mm × 5.0mm 16 pin TSSOP (PWP) package, and 4mm × 4mm 16 pin VQFN (RSA) package, and is specified for an ambient temperature range from –40°C to 85°C.

Features

  • D-CAP2 Control Mode
    • Fast Transient Response
    • No External Parts Required For Loop
      Compensation
    • Compatible with Ceramic Output
      Capacitors
  • Wide Input Voltage Range :
    4.5 V to 18 V
  • Output Voltage Range :
    0.76V to 7.0V
  • Highly Efficient Integrated FETs Optimized
    for Low Duty Cycle Applications
    • 150 mΩ (High Side) and
      100 mΩ (Low Side)
  • High Initial Reference Accuracy
  • Supports Constant 2 A CH1 and
    3 A CH2 Load Current
  • Low-Side rDS(on) Loss-Less Current
    Sensing
  • Adjustable Soft Start
  • Non-Sinking Pre-Biased Soft Start
  • 700 kHz Switching Frequency
  • Cycle-by-Cycle Over-Current Limit Control
  • OCL/UVLO/TSD Protections
  • Hiccup Timer for Overload Protection
  • Adaptive Gate Drivers with Integrated
    Boost PMOS Switch
  • OCP Constant Due To Thermally Compensated
    rDS(on) with 4000ppm/°C
  • 16-Pin HTSSOP, 16-Pin VQFN
  • Auto-Skip Eco-mode™ for High Efficiency at Light Load

WEBENCH® Designer TPS542951

  Min   Max Range
Vin1  V 4.50 to 18.00V
Vout1  V 0.78 to 7V
Iout1  A ≤ 2.00A
 
Vin2  V 4.50 to 18.00V
Vout2  V 0.78 to 7V
Iout2  A ≤ 3.00A
 
Ambient Temp  °C -40.00 to 125.00°C

Parametrics

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Part number Order Regulated outputs (#) Vin (Min) (V) Vin (Max) (V) Iout (Max) (A) Iq (Typ) (mA) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
TPS542951 Order now 2     4.5     18     2     1.3     Enable
Light Load Efficiency
Synchronous Rectification
Soft Start Adjustable    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54294 Order now 2     4.5     18     2     1.3     Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Soft Start Fixed
Power Good    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS542941 Order now 2     4.5     18     2     1.3     Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Soft Start Fixed    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54295 Order now 2     4.5     18     2     1.3     Enable
Light Load Efficiency
Synchronous Rectification
Soft Start Adjustable    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54394 Order now 2     4.8     18     3     1.2     Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Soft Start Fixed    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54395 Order now 2     4.5     18     3     1.2     Enable
Light Load Efficiency
Synchronous Rectification
Multiple Outputs
Soft Start Adjustable    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54494 Order now 2     4.5     18     4     1.2     Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Soft Start Fixed    
Catalog     -40 to 85     HTSSOP | 16
QFN | 16    
16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54495 Order now 2     4.5     18     4     1.2