Image TPS54331
型号: TPS54331
厂商: Texas Instruments Texas Instruments
标准:
分类: 半导体
描述: 3A, 28v input, step down swift?? DC/DC converter with eco-mode
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TPS54331的详细信息

Detail: Feature
SLVS839D JULY 2008REVISED JANUARY 2012  
3A, 28V INPUT, STEP DOWN SWIFTDC/DC CONVERTER WITH ECO-MODE™  
Check for Samples: TPS54331  
1
FEATURES  
APPLICATIONS  
2
3.5V to 28V Input Voltage Range  
Consumer Applications such as Set-Top  
Boxes, CPE Equipment, LCD Displays,  
Peripherals, and Battery Chargers  
Adjustable Output Voltage Down to 0.8V  
Integrated 80 mHigh Side MOSFET Supports  
up to 3A Continuous Output Current  
Industrial and Car Audio Power Supplies  
5V, 12V and 24V Distributed Power Systems  
High Efficiency at Light Loads with a Pulse  
Skipping Eco-mode™  
DESCRIPTION  
Fixed 570kHz Switching Frequency  
Typical 1μA Shutdown Quiescent Current  
Adjustable Slow Start Limits Inrush Currents  
Programmable UVLO Threshold  
The TPS54331 is a 28-V, 3-A non-synchronous buck  
converter that integrates a low RDS(on) high side  
MOSFET. To increase efficiency at light loads, a  
pulse skipping Eco-modefeature 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 TPS54331 is  
available in 8-pin SOIC package and 8-pin SOIC  
PowerPADTM package that have been internally  
optimized to improve thermal performance.  
Overvoltage Transient Protection  
Cycle-by-Cycle Current Limit, Frequency Fold  
Back and Thermal Shutdown Protection  
Available in Easy-to-Use SOIC8 Package or  
Thermally Enhanced SOIC8 PowerPADTM  
Package  
For SWIFTDocumentation, See the TI  
SIMPLIFIED SCHEMATIC  
Figure 1. EFFICIENCY  
TPS54331D  
Ren1  
100  
90  
EN  
VIN  
CI  
VIN  
Ren2  
TPS54331D  
80  
V
=12V  
CBOOT  
I
70  
60  
BOOT  
PH  
V
=18V  
LO  
I
V
=24V  
V
I
OUT  
V
=28V  
I
50  
40  
SS  
COMP  
CO  
D1  
RO1  
V =5V  
I
C1  
R3  
30  
20  
10  
0
CSS  
C2  
VSENSE  
GND  
RO2  
V
1
=3.3V  
O
0.01  
0.1  
10  
I
-LoadCurrent- A  
L
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, 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 © 20082012, Texas Instruments Incorporated  

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