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TPS54308 Datasheet(PDF) 1 Page - Texas Instruments

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Part # TPS54308
Description  4.5-V to 28-V Input, 3-A Output, Synchronous 350-kHz FCCM Step-Down Converter in SOT23 Package
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54308 Datasheet(HTML) 1 Page - Texas Instruments

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Output Current (A)
0
0.5
1
1.5
2
2.5
3
0
10
20
30
40
50
60
70
80
90
100
D019
VIN = 24 V, VOUT = 3.3 V
VIN = 12 V, VOUT = 3.3 V
VIN = 24 V, VOUT = 5 V
VIN = 12 V, VOUT = 5 V
TPS54308
VIN
EN
GND
BOOT
FB
SW
VIN
VOUT
EN
LO
3
1
5
2
4
6
CIN
CBOOT
RFB1
RFB2
CO
Copyright © 2017, Texas Instruments Incorporated
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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.
TPS54308
SLUSCV2 – JUNE 2017
TPS54308 4.5-V to 28-V Input, 3-A Output,
Synchronous 350-kHz FCCM Step-Down Converter in SOT23 Package
1
1 Features
1
4.5-V to 28-V Wide Input Voltage Range
Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A,
Continuous Output Current
Low 2-μA Shutdown, 300-μA Quiescent Current
Internal 5-mS Soft-Start
Fixed 350-kHz Switching Frequency
Peak Current Mode Control
Internal Loop Compensation
Overcurrent Protection for Both MOSFETs with
Hiccup Mode Protection
Over Voltage Protection
Thermal Shutdown
SOT-23 (6) Package
Create a Custom Design Using the TPS54308
With the WEBENCH® Power Designer
2 Applications
12-V, 24-V Distributed Power-Bus Supply
Industry Application
White Goods
Consumer Application
Audio
STB, DTV
Printer
3 Description
The TPS54308 is a 4.5-V to 28-V input voltage range,
3-A synchronous buck converter. The device includes
two
integrated
switching
FETs,
internal
loop
compensation and 5-ms internal soft start to reduce
component count.
By integrating the MOSFETs and employing the SOT-
23 package, the TPS54308 achieves the high power
density and offers a small footprint on the PCB.
The
TPS54308
operates
in
force
continous
conduction mode (FCCM) during light load conditions,
the switching frequency is maintained at an almost
constant level over entire load range.
Cycle-by-cycle
current
limit
in
both
high-side
MOSFET protects the converter in an overload
condition and is enhanced by a low-side MOSFET
freewheeling current limit which prevents current
runaway. Hiccup mode protection is triggered if the
overcurrent condition has persisted for longer than
the present time.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54308
SOT-23(6)
1.60 mm × 2.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
Efficiency vs Output Current


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