TPS2121 2.7-22V, 56mΩ, 4.5A, Priority Power MUX with Seamless Switchover |

TPS2121 (ACTIVE) 2.7-22V, 56mΩ, 4.5A, Priority Power MUX with Seamless Switchover



The TPS212x devices are Dual-Input, Single-Output (DISO) Power Multiplexer (MUX) that are well suited for a variety of systems having multiple power sources.  The devices will Automatically Detect, Select, and Seamlessly Transition between available inputs.

 Priority can be automatically given to the highest input voltage or manually assigned to a lower voltage input to support both ORing and Source Selection operations. A priority voltage supervisor is used to select an input source.

 An Ideal Diode operation is used to seamlessly transition between input sources.  During switchover, the voltage drop is controlled to block reverse current before it happens and provide uninterrupted power to the load with minimal hold-up capacitance.

Current limiting is used during startup and switchover to protect against overcurrent events, and also protects the device during normal operation.  The output current limit can be adjusted with a single external resistor.  

 The TPS212x devices are available in WCSP and small VQFN-HR package options characterized for operation for a temperature range of –40°C to 125°C.


  • Wide Operating Range: 2.8 V to 22 V
    • Absolute Maximum Input Voltage of 24 V
  • Low RON Resistance:
    • TPS2120: 62 mΩ (Typical)
    • TPS2121: 56 mΩ (Typical)
  • Adjustable Overvoltage Supervisor (OVx):
    • Accuracy < ±5%
  • Adjustable Priority Supervisor (PR1):
    • Accuracy < ±5%
  • TPS2121 Supports External Voltage Reference (CP2) with an Accuracy of <1%
  • Output Current Limit (ILM):
    • TPS2120: 1 A – 3 A
    • TPS2121: 1 A – 4.5 A
  • Channel Status Indication (ST)
  • Adjustable Input Settling Time (SS)
  • Adjustable Output Soft Start Time (SS)
  • TPS2121 Fast Output Switchover (tSW): 5 µs (Typical)
  • Low Iq from Enabled Input: 200 µA (Typical)
  • Low Iq from Disabled Input: 10 µA (Typical)
  • Manual Input Source Selection (OVx)
  • Over Temperature Protection (OTP)

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Part number Order IN1, IN2 input voltage (Min) (V) IN1, IN2 input voltage (Max) (V) IN1 rDS(on) (Typ) (mOhm) IN2 rDS(on) (Typ) (mOhms) IN1 output current (Max) (A) IN2 output current (Max) (A) Number of Inputs Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
TPS2121 Order now 2.7     20     56     56     4     4     2     Catalog     -40 to 125     VQFN-HR | 12     12VQFN-HR: 5 mm2: 2 x 2.5 (VQFN-HR | 12)     0.80 | 1ku    
TPS2115A Order now 2.8     5.5     84     84     1.25
2     Catalog     -40 to 85     SON | 8
TSSOP | 8    
See datasheet (SON)
8TSSOP: 19 mm2: 6.4 x 3 (TSSOP | 8)    
0.75 | 1ku    
TPS2120 Order now 2.7     20     62     62     3     3     2     Catalog     -40 to 125     DSBGA | 20     See datasheet (DSBGA)     0.78 | 1ku