TPS54622_15 Datasheet, PDF (1/41 Pages) Texas Instruments – TPS54622 4.5-V to 17-V Input, 6-A Synchronous Step-Down SWIFT™ Converter With Hiccup Protection

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TPS54622
SLVSA70C – MARCH 2011 – REVISED AUGUST 2015
TPS54622 4.5-V to 17-V Input, 6-A Synchronous Step-Down SWIFT™ Converter With
Hiccup Protection
1 Features
•1 Integrated 26-mΩ and 19-mΩ MOSFETs
• Split Power Rail: 1.6 V to 17 V on PVIN
• 200-kHz to 1.6-MHz Switching Frequency
• Synchronizes to External Clock
• 0.6V ±1% Voltage Reference Overtemperature
• Hiccup Current Limit
• Monotonic Start-Up Into Prebiased Outputs
• –40°C to 150°C Operating Junction Temperature
Range
• Adjustable Slow Start and Power Sequencing
• Power Good Output Monitor for Undervoltage and
Overvoltage
• Adjustable Input Undervoltage Lockout
• Supported by SwitcherPro™ Software Tool
• For SWIFT™ Documentation and SwitcherPro™,
visit http://www.ti.com/swift
2 Applications
• High-Density Distributed Power Systems
• High-Performance Point-of-Load Regulation
• Broadband, Networking, and Optical
Communications Infrastructure
3 Description
The TPS54622 device in thermally enhanced 3.5-mm
× 3.5-mm VQFN package is a full-featured 17-V, 6-A
synchronous step-down converter which is optimized
for small designs through high efficiency and
integrating the 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
footprint of the inductor.
The output voltage start-up 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. There is also a low-side
sinking current limit which turns off the low-side
MOSFET to prevent excessive reverse current.
Hiccup protection will be triggered if the overcurrent
condition has persisted for longer than the preset
time. Thermal hiccup protection disables the device
when the die temperature exceeds the thermal
shutdown temperature and enables the part again
after the built-in thermal shutdown hiccup time.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54622
VQFN (14)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
V_IN
R3
C_SS R_RT C1
Simplified Schematic
TPS54622
VIN
BOOT
EN
PH
C_BOOT
L_O
PWRGD
SS
RT/CLK
COMP
VSENSE
GND
PowerPad
C2
V_OUT
R1
R2
Efficiency vs Load Current
100
95
90
85
VIN = 8 V
80
VIN = 12 V
75
VIN = 17 V
70
65
60
55
50
0
1
2
3
4
5
6
Output 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.