TPS54478 2.95V to 6V Input, 4A Synchronous Step-Down SWIFT™ Converter with Hiccup Current Limit | TI.com

TPS54478 (ACTIVE) 2.95V to 6V Input, 4A Synchronous Step-Down SWIFT™ Converter with Hiccup Current Limit

 

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Description

The TPS54478 device is a full featured 6-V, 4-A, synchronous step down current mode converter with two integrated MOSFETs.

The TPS54478 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2-MHz switching frequency, and minimizing the IC footprint with a small 3-mm × 3-mm thermally enhanced WQFN package.

The TPS54478 provides accurate regulation for a variety of loads with an accurate ±1% voltage reference (VREF) over temperature. Efficiency is maximized through the integrated 30-mΩ MOSFETs and 525-µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2.5 µA by entering a shutdown mode.

Undervoltage lockout is internally set at 2.6 V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage start-up ramp is controlled by the soft-start pin. An open-drain power-good signal indicates the output is within 93% to 107% of its nominal voltage.

Cycle-by-cycle current limit, hiccup overcurrent protection, and thermal shutdown protect the device during an overcurrent condition.

For more SWIFT™ documentation, see the TI website at www.ti.com/swift.

Features

  • Two 30-mΩ (typical) MOSFETs for High Efficiency at 4-A Loads
  • 200-kHz to 2-MHz Switching Frequency
  • 0.6-V ± 1% Voltage Reference Over Temperature (–40°C to +150°C)
  • Start-up With Prebiased Voltage
  • Synchronizes to External Clock
  • Adjustable Slow Start / Sequencing
  • UV and OV Power-Good Output
  • Cycle by Cycle Current Limit and Hiccup Current Protection
  • Thermally Enhanced 3-mm × 3-mm 16-Pin WQFN (RTE)
  • Pin Compatible to TPS54418
  • Create a Custom Design Using the TPS54478 With the WEBENCH® Power Designer

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WEBENCH® Designer TPS54478

  Min   Max Range
Vin  V 2.95 to 6.0V
Vout  V 0.6 to 4.5V
Iout  A ≤ 4A
Ambient Temp  °C -40 to 140°C

Parametrics

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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)
TPS54478 Order now 2.95     6     0.6     4.5     4     1     200     2000     0.525     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable    
Current Mode     98     -40 to 150     Catalog     WQFN | 16     Converter     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)    
TPS54218 Order now 2.95     6     0.8     4.5     2     1     200     2000     0.35     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Current Mode     98     -40 to 150     Catalog     WQFN | 16     Converter     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)    
TPS54318 Order now 2.95     6     0.8     4.5     3     1     200     2000     0.35     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Current Mode     98     -40 to 150     Catalog     WQFN | 16     Converter     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)    
TPS54678 Order now 2.95     6     0.6     4.5     6     1     200     2000     0.57     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable    
Current Mode     98     -40 to 125
-40 to 150    
Catalog     WQFN | 16     Converter     16WQFN: 9 mm2: 3 x 3 (WQFN | 16)