TPS40170_11 Datasheet, PDF (1/49 Pages) Texas Instruments – 4.5-V TO 60-V WIDE-INPUT SYNCHRONOUS PWM BUCK CONTROLLER

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TPS40170
SLUS970 – MARCH 2011
4.5-V TO 60-V WIDE-INPUT SYNCHRONOUS PWM BUCK CONTROLLER
Check for Samples: TPS40170
FEATURES
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• 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
• Bi-directional -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
• 8.0-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 Converters for Industrial, Networking
and Telecomm Equipment
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 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 via 1% ensured accuracy. Additionally, the
controller implements a novel scheme of bi-directional
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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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.
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 © 2011, Texas Instruments Incorporated