TPS54320_15 Datasheet, PDF (1/42 Pages) Texas Instruments – TPS54320 4.5- to 17-V Input, 3-A Synchronous Step Down SWIFT™ Converter

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TPS54320
SLVS982B – AUGUST 2010 – REVISED NOVEMBER 2014
TPS54320 4.5- to 17-V Input, 3-A Synchronous Step Down SWIFT™ Converter
1 Features
•1 Integrated 57-mΩ / 50-mΩ MOSFETs
• Split Power Rail: 1.6 to 17 V on PVIN
• 200-kHz to 1.2-MHz Switching Frequency
• Synchronizes to External Clock
• 0.8-V Voltage Reference With ±1% Accuracy
• Low 2-µA Shutdown Quiescent Current
• Hiccup Overcurrent Protection
• Monotonic Start-Up into Prebiased Outputs
• –40°C to 150°C Operating Junction Temperature
Range
• Pin-to-Pin Compatible With the TPS54620
• Adjustable Slow Start/Power Sequencing
• Power Good Output for Undervoltage and
Overvoltage Monitoring
• Adjustable Input Undervoltage Lockout (UVLO)
• Supported by SwitcherPro™ Software Tool
• For SWIFT™ Documentation and SwitcherPro,
Visit www.ti.com/swift
2 Applications
• Broadband, Networking, and Communication
Infrastructure
• Automated Test and Medical Equipment
• DSP and FPGA Point-of-Load Applications from
12-V Bus
3 Description
The TPS54320 is a full featured 17-V, 3-A
synchronous step-down converter which is optimized
for small designs through high efficiency and
integrated high-side and low-side MOSFETs. Further
space savings are achieved through current mode
control, which reduces component count, and by
selecting a high switching frequency, reducing the
inductor's footprint.
The output voltage startup ramp is controlled by the
SS/TR pin which allows operation as either a stand
alone power supply or in tracking situations. Power
sequencing is also possible by correctly configuring
the enable and the open drain power good pins.
Cycle by cycle current limiting on the high-side FET
protects the device in overload situations and is
enhanced by a low-side sourcing current limit which
prevents current runaway. Hiccup protection will be
triggered if the overcurrent condition has persisted for
longer than the preset time. Thermal shutdown
disables the part when die temperature exceeds
thermal shutdown temperature. The TPS54320 is
available in a 14-pin, 3.5-mm × 3.5-mm VQFN,
thermally-enhanced package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54320
VQFN (14)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
Cin
Css Rrt C2
Simplified Schematic
PVIN
VIN
TPS54320
BOOT
Cboot
EN
PH
PWRGD
Lo
Co
SS/TR ^VSENSE
RT/CLK
COMP GND
R3
Exposed
Thermal
C1
Pad
VOUT
R1
R2
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency vs Load Current
VOUT = 1.8 V ^{VOUT = 3.3 V VOUT = 5 V}
VIN = 12 V,
Fsw = 500 kHz
0.5
1
1.5
2
2.5
3
Load Current - A
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.