TPS54202 4.5V 至 28V 输入、2A 输出、EMI 友好型同步降压转换器
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TPS54202 4.5-V to 28-V Input, 2-A Output, EMI Friendly
Synchronous Step Down Converter
1 Features
• 4.5-V to 28-V wide input voltage range
• Integrated 148-mΩ and 78-mΩ MOSFETs for 2-A,
continuous output current
• Low 2-μA shutdown, 45-μA quiescent current
• Internal 5-mS soft start
• Fixed 500-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
• Overvoltage 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
3 Description
The TPS54202 is a 4.5-V to 28-V input voltage
range, 2-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 TPS54202 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.
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
PART NUMBER PACKAGE
(1)
BODY SIZE (NOM)
TPS54202 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.
VIN
EN
GND
BOOT
FB
SW
VIN
VOUT
EN
Cin
Lo
Rfb1
Rfb2
Co
Cboot
3
1
5
2
4
6
TPS54202
Copyright © 2016, Texas Instruments Incorporated
Simplified Schematic
Output Current (A)
Efficiency (%)
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
D100
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
Efficiency vs Output Current
www.ti.com
TPS54202
SLVSD26B – APRIL 2016 – REVISED APRIL 2021
Copyright © 2021 Texas Instruments Incorporated
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Product Folder Links: TPS54202
TPS54202
SLVSD26B – APRIL 2016 – REVISED APRIL 2021
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.
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