TPS54233_15 Datasheet, PDF (1/29 Pages) Texas Instruments – TPS54233 2A, 28V Input, Step Down DC/DC Converter With Eco-mode™

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS54233
SLUS859C – OCTOBER 2008 – REVISED JANUARY 2015
TPS54233 2A, 28V Input, Step Down DC/DC Converter With Eco-mode™
1 Features
•1 3.5 V to 28 V Input Voltage Range
• Adjustable Output Voltage Down to 0.8 V
• Integrated 80 mΩ High Side MOSFET Supports
up to 2A Continuous Output Current
• High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
• Fixed 300 kHz Switching Frequency
• Typical 1 μA Shutdown Quiescent Current
• Adjustable Slow Start Limits Inrush Currents
• Programmable UVLO Threshold
• Overvoltage Transient Protection
• Cycle by Cycle Current Limit, Frequency Fold
Back and Thermal Shutdown Protection
• Available in Easy-to-Use SOIC8 Package
• Supported by WEBENCH^® Software Tool
(www.TI.com/WEBENCH)
2 Applications
• Consumer Applications such as Set-Top Boxes,
CPE Equipment, LCD Displays, Peripherals, and
Battery Chargers
• Industrial and Car Audio Power Supplies
• 5V, 12V and 24V Distributed Power Systems
3 Description
The TPS54233 is a 28 V, 2 A non-synchronous buck
converter that integrates a low R_DS(on) high side
MOSFET. To increase efficiency at light loads, a
pulse skipping Eco-mode™ feature is automatically
activated. Furthermore, the 1 μA shutdown supply
current allows the device to be used in battery
powered applications. Current mode control with
internal slope compensation simplifies the external
compensation calculations and reduces component
count while allowing the use of ceramic output
capacitors. A resistor divider programs the Hysteresis
of the input under-voltage lockout. An overvoltage
transient protection circuit limits voltage overshoots
during startup and transient conditions. A cycle by
cycle current limit scheme, frequency fold back and
thermal shutdown protect the device and the load in
the event of an overload condition. The TPS54233 is
available in an 8-pin SOIC package that has been
internally optimized to improve thermal performance.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54233
SOIC (8)
4.90 mm x 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
Ren1
Ren2
EN
VIN
TPS54233
BOOT
PH
SS
COMP
C_SS ^C7
C6
R3
VSENSE
GND
VIN
C_I
C_BOOT
L_O
D1
C_O
VOUT
R5
R6
Efficiency
100
95
V_O = 3.3 V
V_IN = 8 V
V_IN = 12 V
V_IN = 15 V
90
85
80
V_IN = 18 V
75
70
65
60
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
I_O - Output Current - A
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.