TPS43351-Q1 (ACTIVE)

Automotive 4V to 40V Low Iq Dual Synchronous Buck Controller with Freq. Spread Spectrum


Integrated pre-boost versions available

TPS43330-Q1 | TPS43330A-Q1 | TPS43332-Q1 | TPS43333-Q1 | TPS43335-Q1 | TPS43336-Q1 | TPS43337-Q1


The TPS43350-Q1 and TPS43351-Q1 include two current-mode synchronous buck controllers designed for the harsh environment in automotive applications. The devices are ideal for use in a multi-rail system with low quiescent requirements, as they automatically operate in low-power mode (consuming typically 30 µA) at light loads. The devices offer protection features such as thermal, soft-start, and overcurrent protection. During short-circuit conditions of the regulator output, activation of the current-foldback feature can limit the current through the MOSFETs for control of power dissipation. The two independent soft-start inputs allow ramp-up of the output voltage independently during start-up.

The programmable range of the switching frequency is from 150 kHz to 600 kHz, as is the frequency of an external clock to which the devices can synchronize. Additionally, the TPS43351-Q1 offers frequency-hopping spread-spectrum operation.


  • Qualified for Automotive Applications
  • AEC-Q100 Test Guidance With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level H2
    • Device HBM CDM Classification Level C2
  • Two Synchronous Buck Controllers
  • Input Range up to 40 V (Transients up to 60 V)
  • Low-Power Mode IQ: 30 µA (One Buck On), 35 µA (Two Bucks On)
  • Low Shutdown Current Ish < 4 µA
  • Buck Output Range 0.9 V to 11 V
  • Programmable Frequency and External Synchronization Range 150 kHz to 600 kHz
  • Separate Enable Inputs (ENA, ENB)
  • Frequency Spread Spectrum (TPS43351-Q1)
  • Selectable Forced Continuous Mode or Automatic Low-Power Mode at Light Loads
  • Sense Resistor or Inductor DCR Sensing
  • Out-of-Phase Switching Between Buck Channels
  • Peak Gate Drive Current 1.5 A
  • Thermally Enhanced, 38-Pin HTSSOP (DAP) PowerPAD™ Package

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Parametrics Compare all products in Power Management Multi-Channel IC (PMIC) Solutions

Regulated Outputs (#)
Processor Supplier
Processor Name
Vin (Min) (V)
Vin (Max) (V)
Step-Up DC/DC Controller
Step-Down DC/DC Controller
Step-Up DC/DC Converter
Step-Down DC/DC Converter
Iout (Max) (A)
Iq (Typ) (mA)
Shutdown Current (Typ) (uA)
Operating Temperature Range (C)
TPS43351-Q1 TPS43350-Q1
2    2   
Generic    Generic   
Generic    Generic   
4    4   
40    40   
0    0   
2    2   
0    0   
0    0   
0    0   
6    6   
0.03    0.03   
Over Current Protection
Power Good
Synchronous Rectification
Thermal Shutdown
UVLO Fixed   
Over Current Protection
Power Good
Synchronous Rectification
Thermal Shutdown
UVLO Fixed   
2.5    2.5   
Automotive    Automotive   
-40 to 125    -40 to 125