1 Features
• 4.5V to 24V input voltage range
• 0.6V to 5.5V output voltage
• Integrated 9.2mΩ and 4.5mΩ FETs
• Support 12A continuous output current
• 90uA low quiescent current
• ± 1.0% reference voltage accuracy (25°C)
• D-CAP3™ control mode architecture control for fast
transient response
• Support POSCAP and all MLCC output capacitor
• Selectable Eco-mode and Out-of-Audio™ mode
with dynamic change
• ULQ™ extended battery life during system standby
• Built-in output discharge function
• Integrated power-good indicator
• 600kHz and 1MHz selectable switching frequency
• Fixed 1.0ms soft-start time
• Large duty cycle operation
• Cycle-by-cycle overcurrent and negative
overcurrent protection
• Latched output OV and UV protections
• Non-latched UVLO and OT protections
• –20°C to 125°C operating junction temperature
• 13-pin 3.0mm × 4.0mm HotRod™ VQFN package
• Create a custom design using the TPS51388 with
the WEBENCH® Power Designer

2 Applications
• Notebook and PC computers
• Ultrabook, handheld tablet computers
• Industrial PC, single-board computers
• Non-military drone
• Distributed power systems

3 Description
The device is a monolithic, 12A, synchronous buck
converter with integrated MOSFETs that enable
high efficiency and offer ease-of-use with minimum
external component count for space-conscious power
systems.
The TPS51388 employs D-CAP3 control mode that
provides fast transient response and excellent line
and load regulation with internal compensation.
The ULQ extended battery life feature is extremely
beneficial for long battery life in low power operation.
The large duty operation greatly improves the load
transient performance when input voltage is low.
The EN pin can be used to set Eco-mode or
Out-of-Audio (OOA) mode for light-load operation.
The Eco-mode maintains high efficiency during light
load operation. The OOA mode keeps the switching
frequency above audible frequency with minimum
reduction in efficiency. The EN pin can be toggled
dynamically, even when the converter is in operation.
The TPS51388 integrates a power-good indicator and
provides an output discharge function. The TPS51388
provides complete protection including OVP, UVP,
OCP, OTP, and UVLO. The device is available in
a 13-pin, 3.0mm × 4.0mm HotRod package, and
the junction temperature is specified from –20°C to
125°C.