Step-Down Converter. TPS5450-EP Datasheet

TPS5450-EP Converter. Datasheet pdf. Equivalent


etcTI TPS5450-EP
TPS5450-EP
www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009
5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER
FEATURES
1
2 Qualified for Automotive Applications
Wide Input Voltage Range: 5.5 V to 36 V
Up to 5-A Continuous (6-A Peak) Output
Current
High Efficiency Greater than 90% Enabled by
110-mIntegrated MOSFET Switch
Wide Output Voltage Range: Adjustable Down
to 1.22 V with 1.5% Initial Accuracy
Internal Compensation Minimizes External
Parts Count
Fixed 500-kHz Switching Frequency for Small
Filter Size
18-µA Shutdown Supply Current
Improved Line Regulation and Transient
Response by Input Voltage Feed Forward
System Protected by Overcurrent Limiting,
Overvoltage Protection, and Thermal
Shutdown
Available in Small Thermally Enhanced 8-Pin
SOIC PowerPAD™ Package
For SWIFT™ Documentation, Application
Reports and Design Software, See the TI
Website at www.ti.com/swift
APPLICATIONS
High-Density Point-of-Load Regulators
LCD Displays, Plasma Displays
Battery Chargers
12-V/24-V Distributed Power Systems
SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
Controlled Baseline
One Assembly/Test Site
One Fabrication Site
Available in Military (–55°C/125°C)
Temperature Range(1)
Extended Product Life Cycle
Extended Product-Change Notification
Product Traceability
DESCRIPTION
As a member of the SWIFT™ family of DC/DC
regulators, the TPS5450 is a high-output-current
PWM converter that integrates a low-resistance
high-side N-channel MOSFET. Included on the
substrate with the listed features are a
high-performance voltage error amplifier that provides
tight voltage regulation accuracy under transient
conditions, an undervoltage-lockout circuit to prevent
start-up until the input voltage reaches 5.5 V, an
internally set slow-start circuit to limit inrush currents,
and a voltage feed-forward circuit to improve the
transient response. Using the ENA pin, shutdown
supply current is reduced to 18 µA typically. Other
features include an active-high enable, overcurrent
limiting, overvoltage protection, and thermal
shutdown. To reduce design complexity and external
component count, the TPS5450 feedback loop is
internally compensated.
The TPS5450 device is available in a thermally
enhanced, 8-pin SOIC PowerPAD™ package. TI
provides evaluation modules and software tools to aid
in achieving high-performance power supply designs
to meet aggressive equipment development cycles.
(1) Additional temperature ranges are available - contact factory
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.
SWIFT, PowerPAD are trademarks 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 © 2009, Texas Instruments Incorporated


TPS5450-EP Datasheet
Recommendation TPS5450-EP Datasheet
Part TPS5450-EP
Description Step-Down Converter
Feature TPS5450-EP; TPS5450-EP www.ti.com ..............................................................................
Manufacture etcTI
Datasheet
Download TPS5450-EP Datasheet




etcTI TPS5450-EP
TPS5450-EP
SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com
Simplified Schematic
Efficiency vs Output Current
VIN
VIN PH
NC BOOT
NC
ENA VSENSE
GND
VOUT
100
95
90
85
80
75
70
65
60
55
50
0
VI = 12 V,
VO = 5 V,
fs = 500 kHz,
TA = 25°C
1 2 345
IO - Output Current - A
6
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
TA
–55°C to 125°C
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
Thermally Enhanced
SOIC – DDA
Reel of 2500
TPS5450MDDAREP
TOP-SIDE MARKING
5450EP
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted) (1) (2)
VIN –0.3 V to 40 V(3)
BOOT
PH (steady-state)
–0.3 V to 50 V
–0.6 V to 40 V(3)
VI Input voltage range
ENA
BOOT-PH
–0.3 V to 7 V
10 V
VSENSE
–0.3 V to 3 V
PH (transient < 10 ns)
–1.2 V
IO Source current
Ilkg Leakage current
TJ Operating virtual-junction temperature range
Tstg Storage temperature
PH
PH
Internally Limited
10 µA
–55°C to 150°C
–65°C to 150°C
(1) Stresses beyond those listed under the absolute maximum ratings may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these or any other conditions beyond those indicated under the recommended
operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.
(3) Approaching the absolute maximum rating for the VIN pin may cause the voltage on the PH pin to exceed the absolute maximum rating.
2 Submit Documentation Feedback
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS5450-EP



etcTI TPS5450-EP
TPS5450-EP
www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009
DISSIPATION RATINGS(1) (2)
PACKAGE
8-Pin DDA (4-layer board with solder)(3)
THERMAL IMPEDANCE
JUNCTION-TO-AMBIENT
30°C/W
(1) Maximum power dissipation may be limited by overcurrent protection.
(2) Power rating at a specific ambient temperature TA should be determined with a junction temperature of 125°C. This is the point where
distortion starts to substantially increase. Thermal management of the final PCB should strive to keep the junction temperature at or
below 125°C for best performance and long-term reliability. See Thermal Calculations in applications section of this data sheet for more
information.
(3) Test board conditions:
a. 2 in x 1.85 in, 4 layers, 0.062-in (1,57-mm) thickness
b. 2-oz copper traces located on the top and bottom of the PCB
c. 2-oz copper ground planes on the two internal layers
d. Four thermal vias in the PowerPAD area under the device package
RECOMMENDED OPERATING CONDITIONS
VI Input voltage range
TJ Operating junction temperature
MIN MAX UNIT
5.5 36 V
–55 125 °C
ELECTRICAL CHARACTERISTICS
TJ = –55°C to 125°C, VIN = 5.5 V to 36 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SUPPLY VOLTAGE (VIN PIN)
IQ Quiescent current
VSENSE = 2 V, Not switching, PH pin open
Shutdown, ENA = 0 V
UNDERVOLTAGE LOCK OUT (UVLO)
Start threshold voltage, UVLO
Hysteresis voltage, UVLO
VOLTAGE REFERENCE
Voltage reference accuracy
OSCILLATOR
TJ = 25°C
IO = 0 A – 5 A; TJ = Full Range
Internally set free-running frequency
Minimum controllable on time
TJ = 25°C
TJ = Full Range
Maximum duty cycle
ENABLE (ENA PIN)
Start threshold voltage, ENA
Stop threshold voltage, ENA
Hysteresis voltage, ENA
Internal slow-start time (0~100%)
CURRENT LIMIT
Current limit
Current limit hiccup time
THERMAL SHUTDOWN
TJ = 25°C
TJ = Full Range
TJ = 25°C
TJ = Full Range
Thermal shutdown trip point
Thermal shutdown hysteresis
MIN TYP MAX UNIT
3 4.4 mA
18 60 µA
5.3 V
330 mV
1.202 1.221 1.239
1.193 1.221 1.245
V
400 500 600 kHz
375 500 600
150 220 ns
87 89
%
0.5
450
5.4 8
1.3 V
V
mV
10 ms
6.0 7.5 9.0 A
4.4 7.5 11.7
13 16 20 ms
13 16 22.5
135 162
14
°C
°C
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS5450-EP
Submit Documentation Feedback
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