TPS40170 is a full-featured, synchronous PWM buck controller that operates at an input
voltage between 4.5 V and 60 V and is optimized for high-power-density,
high-reliability dc-dc converter applications. The controller implements voltage-mode control with
input-voltage feed-forward compensation that enables instant response to an input voltage change.
The switching frequency is programmable from 100 kHz to 600 kHz.
The TPS40170 has a complete set of system protection and monitoring features such as
programmable UVLO, programmable overcurrent protection (OCP) by sensing the low-side FET,
selectable short-circuit protection (SCP) by sensing the high-side FET, and thermal shutdown. The
ENABLE pin allows for system shutdown in a low-current (1-µA typical) mode. The controller supports
pre-biased output, provides an open-drain PGOOD signal, and has closed-loop soft-start,
output-voltage tracking, and adaptive dead-time control.
TPS40170 provides accurate output-voltage regulation within 1% accuracy. Additionally,
the controller implements a novel scheme of bidirectional synchronization with one controller
acting as the master and other downstream controllers acting as slaves, synchronized to the master
in-phase or 180° out-of-phase. Slave controllers can be synchronized to an external clock within
±30% of the free-running switching frequency.
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