TPS54824 Datasheet, PDF (1/38 Pages) Texas Instruments – 4.5-V to 17-V Input, Current Mode, 8-A Synchronous SWIFT Step-Down Converter

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TPS54824
SLVSDC9 – NOVEMBER 2016
TPS54824 4.5-V to 17-V Input, Current Mode, 8-A Synchronous SWIFT™ Step-Down
Converter
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
• Supported at the WEBENCH^® Design Center
2 Applications
• Telecom and Wireless Infrastructure
• Industrial Automated Test Equipment
• Enterprise Switching and Storage Applications
• High Density Distributed Power Systems
V_IN
CI
CSS
RT
CP
Simplified Schematic
TPS54824
CBT
BOOT
VIN
SW
EN
PGOOD
SS/TRK
FB
RT/CLK
COMP
RC
AGND
PGND
CZ
LO
CO
V_OUT
RFBT
RFBB
Copyright © 2016, Texas Instruments Incorporated
3 Description
The TPS54824 is a full featured 17-V, 8-A
synchronous step-down 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)
TPS54824
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.
100
95
90
85
80
75
70
65
60
55
50
0.0
Efficiency
12 V to 3.3 V, 800 kHz, L = 1 µH, DCR = 8.4 m:
12 V to 1.5 V, 600 kHz, L = 1 µH, DCR = 8.4 m:
9 V to 1 V, 700 kHz, L = 680 nH, DCR = 7 m:
5 V to 1 V, 700 kHz, L = 680 nH, DCR = 7 m:
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
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.