Datasheet Texas Instruments PTH04000WAST — 数据表

PTH04000W
www.ti.com SLTS247B – JUNE 2005 – REVISED OCTOBER 2007 3-A, 3.3/5-V INPUT, ADJUSTABLE SWITCHING REGULATOR
WITH AUTO-TRACKв„ў SEQUENCING
FEATURES 1 Up to 3-A Output Current at 85В°C 3.3-V / 5-V Input Voltage Wide-Output Voltage Adjust
(0.9 V to 3.6 V) Efficiencies Up To 94% On/Off Inhibit Undervoltage Lockout (UVLO) Output Overcurrent Protection
(Nonlatching, Auto-Reset) Overtemperature Protection Ambient Temperature Range: –40°C to 85°C
2 Point-of-Load Alliance (POLAв„ў) Compatible
Surface Mount Package
Safety Agency Approvals:
-UL/IEC/CSA-22.2 60950-1 APPLICATIONS Telecommunications, Instrumentation,
and General-Purpose Circuits DESCRIPTION
The PTH04000W is a highly integrated, low-cost switching regulator module that delivers up to 3 A of output
current. Occupying a small PCB area, the PTH04000W provides output current at a high efficiency and with
minimal power dissipation, thereby eliminating the need for a heat sink. Their small size (0.75 inch Г— 0.5 inch),
high efficiency, and low cost makes these modules practical for a variety of applications.
The input voltage range of the PTH04000W is from 3 V to 5.5 V, allowing operation from either a 3.3-V or 5-V
input bus. Using state-of-the-art switched-mode power-conversion technology, the PTH04000W can step down to
voltages as low as 0.9 V from a 5-V input bus, with typically less than 1 W of power dissipation. The output
voltage can be adjusted to any voltage over the range, 0.9 V to 3.6 V, using a single external resistor. This series
includes Auto-Trackв„ў sequencing. This feature simplifies the task of supply voltage sequencing in a power
system by enabling modules to track each other, or any external voltage, during power up and power down.
Other operating features include an undervoltage lockout (UVLO), on/off inhibit, output overcurrent protection,
and overtemperature protection. Target applications include telecommunications, test and measurement …