TPS5450-Q1 Datasheet, PDF (1/25 Pages) Texas Instruments – 5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER

TPS5450-Q1
www.ti.com
SLVS834A – JULY 2008 – REVISED OCTOBER 2011
5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER
Check for Samples: TPS5450-Q1
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-mΩ Integrated 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
• –40°C to 125°C Operating Junction
Temperature Range
• 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
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.
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
V_I = 12 V,
V_O = 5 V,
f_s = 500 kHz,
T_A = 25°C
1
2
3
4
5
6
I_O - Output Current - A
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 © 2008–2011, Texas Instruments Incorporated