TPS54424 Datasheet, PDF (1/40 Pages) Texas Instruments – 4.5-V to 17-V Input, 4-A Synchronous SWIFT Step-Down Converter with Current Mode Control

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TPS54424
SLVSDV8 – JULY 2017
TPS54424 4.5-V to 17-V Input, 4-A Synchronous SWIFT™ Step-Down Converter with
Current Mode Control
1 Features
•1 Small 3.5-mm x 3.5-mm HotRod™ QFN Package
• Integrated 14.1-mΩ and 6.1-mΩ MOSFETs
• Peak Current Mode Control with Fast Transient
Response
• 200-kHz to 1.6-MHz Fixed Switching Frequency
• Synchronizes to External Clock
• 0.6-V Voltage Reference ±0.85% Over
Temperature
• 0.6-V to 12-V Output Voltage Range
• Hiccup Current Limit
• Safe Startup into Pre-Biased Output Voltage
• Adjustable Soft-start and Power Sequencing
• Adjustable Input Under Voltage Lockout
• 3-µA Shutdown Current
• Power Good Output Monitor for Undervoltage and
Overvoltage
• Output Overvoltage Protection
• Non-latch Thermal Shutdown Protection
• –40°C to 150°C Operating Junction Temperature
• Create a Custom Design Using the TPS54424
With the WEBENCH^® Power Designer
2 Applications
• Telecom and Wireless Infrastructure
• Test and Measurement
• Medical Imaging Equipment
• Enterprise Switching
• Server
Simplified Schematic
V_IN
CI
CSS
RT
CP
TPS54424
CBT
BOOT
VIN
SW
EN
PGOOD
SS/TRK
FB
RT/CLK
COMP
RC
AGND
PGND
CZ
LO
CO
V_OUT
RFBT
RFBB
Copyright © 2017, Texas Instruments Incorporated
3 Description
The TPS54424 is a full featured 17-V, 4-A
synchronous step-down DC/DC converter in a 3.5
mm x 3.5 mm HotRod™ QFN package.
The device is optimized for small solution size
through high efficiency and integrating the high-side
and low-side MOSFETs. Further space savings are
achieved through peak current mode control, which
reduces component count, and by selecting a high
switching frequency, reducing the inductor footprint.
The peak current mode control simplifies the loop
compensation and provides fast transient response.
Cycle-by-cycle peak current limiting on the high-side
and low-side sourcing current limit protects the device
in overload situations. Hiccup limits MOSFET power
dissipation if a short circuit or over loading fault
persists.
A power good supervisor circuit monitors the
regulator output. The PGOOD pin is an open drain
output and goes high impedance when the output
voltage is in regulation. An internal deglitch time
prevents the PGOOD pin from pulling low unless a
fault has occurred.
A dedicated EN pin can be used to control the
regulator on/off and adjust the input under voltage
lockout. The output voltage startup ramp is controlled
by the SS/TRK pin which allows operation as either a
standalone power supply or in tracking situations.
Device Information₍₁₎
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54424
RNV (18)
3.50 mm x 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency
100
95
90
85
80
75
70
65
60
5 V to 1.8 V, 700 kHz, 1.8 µH, 18 m:
55
9 V to 1.8 V, 700 kHz, 1.8 µH, 18 m:
12 V to 1.8 V, 700 kHz, 1.8 µH, 18 m:
50
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Output Current (A)
D001
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.