TPS55165-Q1 36-V, 1-A Output, 2-MHz, Synchronous Buck-Boost Converter |

TPS55165-Q1 (ACTIVE)

36-V, 1-A Output, 2-MHz, Synchronous Buck-Boost Converter



The TPS5516x-Q1 family of devices is a high-voltage synchronous buck-boost DC-DC converter. The device provides a stable power-supply output from a wide varying input-power supply such as an automotive car battery. The buck-boost overlap control ensures automatic transition between step-down and step-up mode with optimal efficiency. The TPS55165-Q1 output voltage can be set to a fixed level of 5 V or 12 V. The TPS55160-Q1 and TPS55162-Q1 devices have a configurable output voltage ranging from 5.7 V to 9 V that is set by an external resistive divider.

Output currents can be as high as 1 A for a normal car battery voltage, and can be maintained at 0.4 A for lower input voltages, such as those for common battery-cranking profiles. The buck-boost converter is based on a fixed-frequency, pulse-width-modulation (PWM) control circuit using synchronous rectification to obtain maximum efficiency. The switching frequency is set to 2 MHz (typical) which allows for the usage of a small inductor that uses less board space.

A selectable spread-spectrum option (TPS55160-Q1 and TPS55165-Q1) helps reduce radiated electromagnetic interference (EMI). Internal loop compensation eliminates the need for external compensation components. In low-power mode (TPS55160-Q1 and TPS55165-Q1), the device achieves a quiescent current of less than 15 µA which allows an automotive electronic control unit (ECU) to stay in standby mode (for example, listen-to-CAN mode) while achieving OEM quiescent-current requirements. The low-power mode can be disabled which forces the converter to operate in full continuous mode at a fixed switching frequency of 2 MHz (typical) for the entire load-current range. The maximum average current in the inductor is limited to a typical value of 2 A.

The converter can be disabled to minimize battery drain. Furthermore, the device offers a power-good (PG) pin to indicate when the output rail is less than the specified tolerance. The device also has a power-latch function to allow an external microcontroller unit (MCU) to keep the output voltage available for as long as needed.

The device is available in a 20-pin HTSSOP PowerPAD package.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • 2-V to 36-V Input Voltage Range for VOUT = 5 V
  • 5-V or 12-V Fixed Output Voltage (TPS55165-Q1)
  • Adjustable Output Voltage Options from 5.7 V to
    9 V (TPS55160-Q1 and TPS55162-Q1)
  • Up to 85% Efficiency
  • 1-A Output Current for VOUT = 5 V and VIN ≥ 5.3 V
  • 0.8-A Output Current for VOUT = 5 V and
    VIN ≥ 3.8 V
  • 0.4-A Output Current for VOUT = 5 V and
    VIN ≥ 2.3 V
  • Automatic Transition Between Step-Down and Step-Up Mode
  • Low-Power Mode for Improved Efficiency at Light Load Conditions (TPS55160-Q1 and
  • Device Quiescent Current Less than 15 µA in Low-Power Mode (TPS55160-Q1 and
  • Device Shutdown Current Less than 3 µA
  • Forced Fixed-Frequency Operation at 2 MHz
  • Selectable Spread Spectrum (TPS55160-Q1 and TPS55165-Q1)
  • Wake-up Through IGN With Power-Latch Function
  • Smart Power-Good Output With Configurable Delay Time
  • Overtemperature Protection and Output Overvoltage Protection
  • Available in Easy-to-Use 20-Pin HTSSOP PowerPAD™ Package

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Parametrics Compare all products in Buck-boost, inverting & split-rail converters (integrated switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Duty cycle (Max) (%)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Iout (Max) (A)
Operating temperature range (C)
Package Group
TPS55165-Q1 TPIC74100-Q1 TPS55065-Q1 TPS55160-Q1 TPS55162-Q1
Buck-Boost     Buck-Boost     Buck-Boost     Buck-Boost     Buck-Boost    
2     1.5     1.5     3.6     3.6    
36     40     40     36     36    
5     5     5     5.7     5.7    
12     5     5     9     9    
3.5     1.5     1.5     3.5     3.5    
99     99     99     99     99    
2000     330     330     2000     2000    
2000     550     550     2000     2000    
Light Load Efficiency
Power Good
Synchronous Rectification    
Light Load Efficiency
Power Good
Synchronous Rectification    
Light Load Efficiency
Power Good
Synchronous Rectification
UVLO Fixed    
Power Good
Synchronous Rectification
UVLO Fixed    
0.015     0.1     0.1     0.015     0.015    
1         1     1    
Automotive     Automotive     Automotive     Automotive     Automotive    
Converter     Converter     Converter     Converter     Converter    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
HTSSOP | 20     HTSSOP | 20     HTSSOP | 20     HTSSOP | 20     HTSSOP | 20    

Design tool

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WEBENCH® Designer TPS55165-Q1

  Min   Max Range
Vin  V 2.0 to 36.0V
Vout  V 5 to 12V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C