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TPS40193DRCR-TPS40193DRCRG4-TPS40193DRCT
4.5V to 18V Input, Low Pin Count Synchronous Buck Controller with Power Good
HDRV
BOOT
ENABLE
TPS40192
TPS401923BP5PGD
VINVOUT VOUT
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Design
TPS40192, TPS40193SLUS719G –MARCH 2007–REVISED JANUARY 2018
TPS4019x 4.5-V to 18-V Input, 10-Pin, Synchronous Buck Controller With Power Good Features Input Operating Voltage Range: 4.5Vto18V Upto 20-A Output Currents Supports Pre-Biased Outputs 0.5%, 591-mV Reference Switching Frequency TPS40192: 600 kHz TPS40193: 300 kHz Three Selectable Thermally Compensated Short-
Circuit Protection Levels Hiccup Restart from Faults Internal 5-V Regulator High-Side and Low-Side MOSFET ON-resistance
(RDS(on)) Current Sensing 10-Pin3 mm×3 mm SON Package Internal 4-ms Soft-Start Time Thermal Shutdown Protectionat 145°C
Applications Cable Modem CPE Digital Set Top Box Graphics/Audio Cards Entry Level and Mid-Range Servers
DescriptionTPS40192 and TPS40193 are cost-optimized
synchronous buck controllers that operate from 4.5V18V input. These controllers implementa voltage-
mode control architecture with the switching
frequency fixedat either 600 kHz (TPS40192)or 300
kHz (TPS40193). The higher switching frequency
facilitates the use of smaller inductor and output
capacitors, thereby providinga compact power-
supply solution. An adaptive anti-cross conduction
schemeis usedto prevent shoot through currentin
the power FETs.
Short circuit detectionis doneby sensing the voltage
drop across the low-side MOSFET whenitis on and
comparingit witha user selected thresholdof 100
mV, 200 mVor 280 mV. The thresholdis set witha
single external resistor connected from COMP to
GND. This resistoris sensed at startup and the
selected thresholdis latched. Pulse-by-pulse limiting
(to prevent current runaway)is provided by sensing
the voltage across the high-side MOSFET whenitis and terminating the cycle when the voltage drop
rises abovea fixed thresholdof 550 mV. When the
controller senses an output short circuit, both
MOSFETs are turned off anda timeout periodis
observed before attemptingto restart. This behavior
provides limited power dissipationin the eventofa
sustained fault.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Simplified Application Diagram
