TPS54302 Datasheet, PDF (1/28 Pages) Texas Instruments – TPS54302 4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter

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TPS54302
SLVSDG6A – MAY 2016 – REVISED MAY 2016
TPS54302 4.5-V to 28-V Input, 3-A Output, EMI Friendly
Synchronous Step-Down Converter
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, 45-μA Quiescent Current
• Internal 5-mS Soft-Start
• Fixed 400-kHz Switching Frequency
• Frequency Spread Spectrum to Reduce EMI
• Advanced Eco-mode™ Pulse Skip
• 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
2 Applications
• 12-V, 24-V Distributed Power-Bus Supply
• Industry Application
– White Goods
• Consumer Application
– Audio
– STB, DTV
– Printer
Simplified Schematic
TPS54302
3
6
VIN
VIN
BOOT
Cin
1
GND
2
SW
Cboot
Lo
VOUT
5
EN EN
4
FB
Rfb1
Co
Rfb2
Copyright © 2016, Texas Instruments Incorporated
3 Description
The TPS54302 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 TPS54302 achieves the high power
density and offers a small footprint on the PCB.
Advanced Eco-mode implementation maximizes the
light load efficiency and reduces the power loss.
In the TPS54302, the frequency spread spectrum
operation is introduced for EMI reduction.
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)
TPS54302
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.
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
10
0
0.001
V_IN = 12 V, V_OUT = 5 V
V_IN = 12 V, V_OUT = 3.3 V
V_IN = 24 V, V_OUT = 5 V
V_IN = 24 V, V_OUT = 3.3 V
0.01
0.1
Output Current (A)
1
D100
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.