TPS40197_15 Datasheet, PDF (2/29 Pages) Texas Instruments – SYNCHRONOUS BUCK CONTROLLER WITH 4-BIT VID INTERFACE FOR SMART-REFLEX™ DSPs

TPS40197
SLUS886A – NOVEMBER 2008 – REVISED JULY 2012
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION CONTINUED
Short circuit detection is done by sensing the voltage drop across the low-side FET 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 FET
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 FETs are turned off and a timeout period is observed before
attempting to restart. This provides limited power dissipation in the event of a sustained fault.
T_A
–40°C to 85°C
PACKAGE
Plastic Quad
Flatpack
ORDERING INFORMATION⁽¹⁾
ORDERING PART
NUMBER
PINS
OUTPUT
SUPPLY
TPS40197RGYT
TPS40197RGYR
Tube
16
Tape-and-Reel
MINIMUM
ORDER
QUANTITY
250
3000
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
2
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