TPS54308 Datasheet, PDF (1/28 Pages) Texas Instruments – 4.5-V to 28-V Input, 3-A Output, Synchronous 350-kHz FCCM Step-Down Converter in SOT23 Package

Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
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 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
Simplified Schematic
3
VIN
VIN
CIN
6
BOOT
CBOOT
LO
1
GND
TPS54308
2
SW
VOUT
5
EN
EN
4
FB
RFB1
CO
RFB2
Copyright © 2017, Texas Instruments Incorporated
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.
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Output Current
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
0.5
1
1.5
2
2.5
3
Output Current (A)
D019
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.