4.5V to 17V Input, 8-A Synchronous Step-Down Converter with Hiccup Current Limit - TPS54821

TPS54821 (ACTIVE)

4.5V to 17V Input, 8-A Synchronous Step-Down Converter with Hiccup Current Limit

 

Recommended alternative parts

  • TPS54521  -  Looking for a device with less output current? Try the TPS54521.
  • LMZ31707  -  Looking for a power module? Try the LMZ31707
  • TPS56921  -  Looking for a device with more output current? Try the TPS56921.

Description

The TPS54821 in thermally enhanced 3.5 mm × 3.5 mm QFN package is a full featured 17 V, 8 A synchronous step down converter which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the inductor's footprint.

The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.

Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the device when the die temperature exceeds the thermal shutdown temperature and enables the part again after the built-in thermal shutdown hiccup time.

Features

  • Integrated 26 mΩ / 19 mΩ MOSFETs
  • Split Power Rail: 1.6 V to 17 V on PVIN
  • 200 kHz to 1.6 MHz Switching Frequency
  • Synchronizes to External Clock
  • 0.6V ±1% Voltage Reference Over Temperature
  • Low 2 µA Shutdown Quiescent Current
  • Monotonic Start-Up into Pre-biased Outputs
  • Adjustable Slow Start/Power Sequencing
  • Power Good Output Monitor for Undervoltage and
    Overvoltage
  • Adjustable Input Undervoltage Lockout
  • Software Tools Available

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Parametrics Compare all products in Buck Converter (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)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
TPS54821 TPS54521 TPS54620 TPS54622 TPS54824 TPS56921
4.5    4.5    4.5    4.5    4.5    4.5   
17    17    17    17    17    17   
0.6    0.8    0.8    0.6    0.6    0.72   
15    15    15    15    12    1.48   
8    5    6    6    8    9   
1    1    1    1    1    1   
200    200    200    200    200    200   
1600    900    1600    1600    1600    1600   
0.6    0.6    0.6    0.6    0.58    0.77   
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking   
Dynamic Voltage Scaling
Enable
Power Good
Synchronous Rectification
Tracking
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
100    98    98    98    98    100   
-40 to 125    -40 to 125    -40 to 150    -40 to 150    -40 to 150    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
VQFN    VQFN    VQFN    VQFN    VQFN-HR    HTSSOP   
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WEBENCH® Designer TPS54821

  Min   Max Range
Vin  V 4.5 to 17.0V
Vout  V 0.6 to 15.0V
Iout  A ≤ 8A
Ambient Temp  °C -40 to 125°C


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