TPS40170-EP_15 Datasheet, PDF (1/50 Pages) Texas Instruments – 4.5-V TO 60-V WIDE-INPUT SYNCHRONOUS PWM BUCK CONTROLLER

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TPS40170-EP
SLVSBT7A – MARCH 2013 – REVISED APRIL 2013
4.5-V TO 60-V WIDE-INPUT SYNCHRONOUS PWM BUCK CONTROLLER
Check for Samples: TPS40170-EP
FEATURES
1
•2 Wide-Input Voltage Range from 4.5 V to 60 V
• 600-mV Reference Voltage With 1% Accuracy
• Programmable UVLO and Hysteresis
• Voltage-Mode Control With Voltage Feed-
Forward
• Programmable Frequency Between 100 kHz
and 600 kHz
• Bidirectional Frequency Synchronization With
Master/Slave 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
• 8-V and 3.3-V LDO Output
• Integrated Bootstrap Diode
• 20-Pin 3.5-mm × 4.5-mm QFN (RGY) Package
APPLICATIONS
• POL Modules
• Wide Input Voltage, High-Power-Density
DC/DC Converter
SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
• Controlled Baseline
• One Assembly and Test Site
• One Fabrication Site
• Available in Military (–55°C to 125°C)
Temperature Range
• Extended Product Life Cycle
• Extended Product-Change Notification
• Product Traceability
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 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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
NexFET is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated