TPS54623_15 Datasheet, PDF (1/38 Pages) Texas Instruments – 4.5V to 17V Input, 6A Synchronous Step Down SWIFT™ Converter With Light Load Efficiency and Hiccup Over Current Protection

TPS54623
www.ti.com
SLVSB09 – SEPTEMBER 2011
4.5V to 17V Input, 6A Synchronous Step Down SWIFT™ Converter With Light Load
Efficiency and Hiccup Over Current Protection
Check for Samples: TPS54623
FEATURES
1
• Integrated 26mΩ / 19mΩ MOSFETs
• Split Power Rail: 1.6V to 17V on PVIN
• 200kHz to 1.6MHz Switching Frequency
• Light Load Efficient with Pulse Skip
• Synchronizes to External Clock
• 0.6V ±1% Voltage Reference Over Temperature
• Low 2µA Shutdown Quiescent Current
• Monotonic Start-Up into Pre-biased Outputs
• –40°C to 150°C Operating Junction
Temperature Range
• Adjustable Slow Start/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
APPLICATIONS
• High Density Distributed Power Systems
• High Performance Point of Load Regulation
• Broadband, Networking and Optical
Communications Infrastructure
DESCRIPTION
The TPS54623 in thermally enhanced 3.5mm x 3.5mm QFN package is a full featured 17V, 6A 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 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. 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. The TPS54623 operates at continuous current mode (CCM) at higher
load conditions while skipping pulses to boost the efficiency at light loads.
WHITE SPACE
VIN
Cin
Css Rrt C2
SIMPLIFIED SCHEMATIC
PVIN
VIN
TPS546232
BOOT
Cboot
Lo
EN
PH
Co
PWRGD
SS/TR ^VSENSE
RT/CLK
COMP GND
R3
Exposed
Thermal
C1
Pad
VOUT
R1
R2
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
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated