TPS40192_17 Datasheet, PDF (1/35 Pages) Texas Instruments – 4.5-V to 18-V Input, 10-Pin, Synchronous Buck Controller With Power Good

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TPS40192, TPS40193
SLUS719F – MARCH 2007 – REVISED NOVEMBER 2016
TPS4019x 4.5-V to 18-V Input, 10-Pin, Synchronous Buck Controller With Power Good
1 Features
•1 Input Operating Voltage Range: 4.5 V to 18 V
• Up to 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
(R_DS(on)) Current Sensing
• 10-Pin 3 mm × 3 mm SON Package
• Internal 4-ms Soft-Start Time
• Thermal Shutdown Protection at 145°C
2 Applications
• Cable Modem CPE
• Digital Set Top Box
• Graphics/Audio Cards
• Entry Level and Mid-Range Servers
3 Description
TPS40192 and TPS40193 are cost-optimized
synchronous buck controllers that operate from 4.5 V
to 18 V input. These controllers implement a voltage-
mode control architecture with the switching
frequency fixed at either 600 kHz (TPS40192) or 300
kHz (TPS40193). The higher switching frequency
facilitates the use of smaller inductor and output
capacitors, thereby providing a compact power-
supply solution. An adaptive anti-cross conduction
scheme is used to prevent shoot through current in
the power FETs.
Short circuit detection is done by sensing the voltage
drop across the low-side MOSFET when it is on and
comparing it with a user selected threshold of 100
mV, 200 mV or 280 mV. The threshold is set with a
single external resistor connected from COMP to
GND. This resistor is sensed at startup and the
selected threshold is latched. Pulse-by-pulse limiting
(to prevent current runaway) is provided by sensing
the voltage across the high-side MOSFET when it is
on and terminating the cycle when the voltage drop
rises above a fixed threshold of 550 mV. When the
controller senses an output short circuit, both
MOSFETs are turned off and a timeout period is
observed before attempting to restart. This behavior
provides limited power dissipation in the event of a
sustained fault.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS40192
VSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
V_OUT
ON/
OFF
External logic
supply 5-V or
less or BP5
Simplified Application Diagram
V_IN
TPS40192
TPS401923
1 ENABLE HDRV 10
2 FB
SW 9
3 COMP BOOT 8
V_OUT
+3.3V
4 VDD
LDRV 7
PGD
5 PGD
BP5 6
GND
11
Copyright © 2016, Texas Instruments Incorporated
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.