1 Features

• New, similar products available:

– LM5145 75-V synchronous buck controller with

wide input voltage and duty cycle ranges

– LM5146 100-V synchronous buck DC/DC

controller with wide duty-cycle range

• Wide input voltage range from 4.5 V to 60 V

• Reference voltage of 600 mV with 1% accuracy

• Programmable UVLO and hysteresis

• Voltage mode control with voltage feed forward

• Programmable frequency between 100 kHz and

600 kHz

• Bi-directional -frequency synchronization with

primary and secondary option

• Low-side FET sensing overcurrent protection and

high-side FET sensing short-circuit protection with

integrated thermal compensation

• Programmable closed loop soft-start

• Supports pre-biased outputs

• Thermal shutdown at 165°C with hysteresis

• Voltage tracking

• Power good

• ENABLE with 1-μA low current shutdown

• LDO output of 8.0 V and 3.3 V

• Integrated Bootstrap Diode

• 20-Pin 3.5 mm × 4.5 mm VQFN (RGY) package

• Create a Custom Design with WEBENCH® Tools

2 Applications

• POL modules

• Wide input voltage, high-power density DC - DC

converters for industrial, networking, and telecom

equipment

3 Description

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 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 undervoltage lockout (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 softstart,

output voltage tracking and adaptive dead-time

control.

TPS40170 provides accurate output voltage

regulation through 1% ensured accuracy. Additionally,

the controller implements a novel scheme of bidirectional

synchronization with one controller acting

as the primary and other downstream controllers

acting as secondaries synchronized to the primary

in-phase or 180° out-of-phase. Secondary controllers

can be synchronized to an external clock within ±30%

of the free-running switching frequency.

New products (LM5145 and LM5146) offer reduced

BOM cost, higher efficiency, and reduced design size

among many other features.