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
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.
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