TPS54233-Q1 Datasheet, PDF (1/25 Pages) Texas Instruments – 2-A, 28-V INPUT, STEP-DOWN DC/DC CONVERTER WITH ECO-MODE™

TPS54233-Q1
www.ti.com
SLUSAZ7A – MARCH 2012 – REVISED MARCH 2012
2-A, 28-V INPUT, STEP-DOWN DC/DC CONVERTER WITH ECO-MODE™
Check for Samples: TPS54233-Q1
FEATURES
1
•2 Qualified for Automotive Applications
• AEC-Q100 Test Guidance With the Following
Results:
– Device Temperature Grade1: –40°C to
+125°C Ambient Operating Temperature
Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3B
• 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 2-A 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 the SOIC8 Package
• Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
APPLICATIONS
• LCD Displays, Peripherals, and Battery
Chargers
• Car Audio Power Supplies
• 5V, 12V and 24V Distributed Power Systems
DESCRIPTION
The TPS54233-Q1 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-
Q1 is available in an 8-pin SOIC package that has
been internally optimized to improve thermal
performance.
SIMPLIFIED SCHEMATIC
Ren1
Ren2
EN
VIN
TPS54233
BOOT
PH
SS
COMP
C_SS
C₁
C₂
R₃
VSENSE
GND
VIN
C_I
C_BOOT
L_O
D1
C_O
VOUT
R_O1
R_O2
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
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.
Eco-mode, SwitcherPro, 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 © 2012, Texas Instruments Incorporated